whitelabel 404 error in microservice

I am getting below error while aces below micro service from the browser or postman as attached. I see H2 database getting inserterted with data successfully.  Please advise

I am able to start the spring boot servers and also be able to see the data inserted into the H2 Database.

ACCOUNTS AND CUSTOMER H2

http://localhost:8081/h2-console/login.do?jsessionid=4cfecd0415af0b7a7fb18fb59dda08e2 works fine
CARDS H2

http://localhost:9010/h2-console/ works fine
Loans h2

http://localhost:8099/h2-console  works fine
When I access URLs in the browser I get errors like 404 whitelabel errors. Even postman also giving similar errors not sure of any issues with paths, URLs, mappings.

http://localhost:8081/api/v1/accounts/1
Above gives white label 404 as attached


http://localhost:9010/api/v1/cards/1
Above gives white label 404 as attached

http://localhost:8099/api/v1/loans/1  
Above gives white label 404 as attached

Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Sun Apr 21 09:21:37 EDT 2024 There was an unexpected error (type=Not Found, status=404).
Code is as below
package com.je; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class JeHwAccountApplication {   public static void main(String[] args) {      SpringApplication.run(JeHwAccountApplication.class, args);   } }package com.je.controllers; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.je.entities.Account; import com.je.service.AccountService; import lombok.extern.slf4j.Slf4j; @RestController @Slf4j @RequestMapping("/api/v1/accounts") public class AccountController {   //@Autowired   private AccountService accountService;   /*    * @PostMapping public Account CreateProduct(@RequestBody Account product) {    * return productService.createProduct(product); }    *    * @GetMapping("/fetch/{id}") public Account fetchProduct(@PathVariable Integer    * id) { return productService.fetchProduct(id); }    *    * @PutMapping("/update/{id}") public Account updateProduct(@PathVariable    * Integer id,@RequestBody Account product) { return    * productService.updateProduct(id,product); }    *    * @DeleteMapping("/delete/{id}") public void    * deleteProduct(@PathVariable(value="id") Integer productId) {    * productService.deleteProduct(productId); }    */    @GetMapping("/fetch/{customerId}")    public Account fetchAccountDetails(@PathVariable("customerId") int customerId) {       log.info("acct controler ->fetchAccountDetails{}",customerId);       return accountService.fetchAccountDetails(customerId);       } }package com.je.entities; import java.time.LocalDate; import jakarta.persistence.Entity; import jakarta.persistence.GeneratedValue; import jakarta.persistence.GenerationType; import jakarta.persistence.Id; import lombok.Getter; import lombok.Setter; @Entity @Setter @Getter public class Account {   @Id   @GeneratedValue(strategy = GenerationType.IDENTITY)   private Integer accountNumber;   private int customerId;   private String accountType;   private String branchAddress;   private LocalDate createDt; }package com.je.entities; import java.time.LocalDate; import jakarta.persistence.Entity; import jakarta.persistence.GeneratedValue; import jakarta.persistence.GenerationType; import jakarta.persistence.Id; import lombok.Getter; import lombok.Setter; @Entity @Setter @Getter public class Customer {   @Id   @GeneratedValue(strategy = GenerationType.IDENTITY)   private int customerId;   private String name;   private String email;   private String mobileNumber;   private LocalDate createDt; }package com.je.repository; import java.util.Optional; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.stereotype.Repository; import com.je.entities.Account; @Repository //optional public interface AccountRepository extends JpaRepository<Account, Integer>{   Optional<Account> findByCustomerId(Integer custId); }package com.je.service; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.je.entities.Account; //import com.je.entities.Product; import com.je.repository.AccountRepository; @Service public class AccountService {   @Autowired   private AccountRepository accountRepository;   /*    * public Account createProduct(Account product) { Account    * dbProduct=accountRepository.save(product); return dbProduct;    *    * } public Account fetchProduct(Integer id) { // TODO Auto-generated method    * stub return accountRepository.findById(id) .orElseThrow(()-> new    * RuntimeException("account not there in db")); } public Account    * updateProduct(Integer id, Account inputProduct) { // TODO Auto-generated    * method stub Account fetchDatabaseProduct = fetchProduct(id); //    * fetchDatabaseProduct.setName(inputProduct.getBranchAddress()); Account    * result=accountRepository.save(fetchDatabaseProduct); return result; } public    * void deleteProduct(Integer productId) { boolean isExists =    * accountRepository.existsById(productId); if(isExists) {    * accountRepository.deleteById(productId); } else { throw new    * RuntimeException("record not in the databases"); } }    */   public Account fetchAccountDetails(int id) {      // TODO Auto-generated method stub      return accountRepository.findById(id)            .orElseThrow(()-> new RuntimeException("account not there in db"));   } }
spring.application.name=JE-HW-Account server.port=8081 spring.datasource.url=jdbc:h2:mem:accountsdb spring.datasource.username=accounts spring.datasource.password=admin spring.jpa.hibernate.ddl-auto=none spring.h2.console.enabled=true management.endpoints.web.exposure.include=*
DROP TABLE IF EXISTS customer; DROP TABLE IF EXISTS account; CREATE TABLE `customer` (        `customer_id` int AUTO_INCREMENT  PRIMARY KEY,        `name` varchar(100) NOT NULL,        `email` varchar(100) NOT NULL,        `mobile_number` varchar(20) NOT NULL,        `create_dt` date DEFAULT NULL ); CREATE TABLE `account` (        `customer_id` int NOT NULL,         `account_number` int AUTO_INCREMENT  PRIMARY KEY,        `account_type` varchar(100) NOT NULL,        `branch_address` varchar(200) NOT NULL,        `create_dt` date DEFAULT NULL ); INSERT INTO `customer` (`name`,`email`,`mobile_number`,`create_dt`)   VALUES ('je','je@gmail.com','78010079',CURDATE()); INSERT INTO `account` (`customer_id`, `account_number`, `account_type`, `branch_address`, `create_dt`)       VALUES (1, 501000, 'Current', '301 Main Street, nyc', CURDATE());

Well, which endpoint is http://localhost:8081/api/v1/accounts/1 supposed to reach? The mappings in your AccountController class don't match.

Furthermore, even if they did match, the accountService.fetchAccountDetails(customerId) call would fail because accountService is not auto-wired.

With below url got 500 error. Please advise

http://localhost:8081/api/v1/accounts/fetch/1
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Mon Apr 22 22:07:19 EDT 2024
There was an unexpected error (type=Internal Server Error, status=500).

There's nothing we can do with that error message.

You need to either look in the server logs, use a debugger to step through your code, or provide a custom error page.

How to effectively debug these type of intricate errors involving multiple layers like controller, service, repository, configurations and database etc. ?
Please advise

They all run in the same JVM, right? So a debugger would work well, as Stephan said.

Yea, Currently running in my local windows laptop. How to debug paths like below which are given in annotations
api/v1/accounts/fetch/1

I gave wrong path earlier
api/v1/accounts/1

I keep get these type of errors with paths

Multiple hops like browser to app controller and then to database harder to debug I feel especially in enterprise applications

A debugger can set breakpoints in the code, not at particular URLs. So it doesn't matter how code is accessed, only that it does get executed.

Lot of times I am getting access errors. I think i need to put more attention on paths

In log i see below type of error for that 500 error
2024-04-23T21:37:01.037-04:00 ERROR 23148 --- [JE-HW-Account] [nio-8081-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.NullPointerException: Cannot invoke "com.je.service.AccountService.fetchAccountDetails(int)" because "this.accountService" is null] with root cause java.lang.NullPointerException: Cannot invoke "com.je.service.AccountService.fetchAccountDetails(int)" because "this.accountService" is null at com.je.controllers.AccountController.fetchAccountDetails(AccountController.java:45) ~[classes/:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:255) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:188) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:925) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:830) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) ~[spring-webmvc-6.1.5.jar:6.1.5] at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) ~[tomcat-embed-core-10.1.19.jar:6.0] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.1.5.jar:6.1.5] at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.19.jar:6.0] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:109) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]


I do not see this.accountService in below class though
public class AccountService { @Autowired private AccountRepository accountRepository; public Account fetchAccountDetails(int id) { // TODO Auto-generated method stub return accountRepository.findById(id) .orElseThrow(()-> new RuntimeException("account not there in db")); } }


I just uncommented autowired as below
package com.je.controllers; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.je.entities.Account; import com.je.service.AccountService; import lombok.extern.slf4j.Slf4j; @RestController @Slf4j @RequestMapping("/api/v1/accounts") public class AccountController { @Autowired private AccountService accountService; @GetMapping("/fetch/{customerId}") public Account fetchAccountDetails(@PathVariable("customerId") int customerId) { log.info("acct controler ->fetchAccountDetails{}",customerId); return accountService.fetchAccountDetails(customerId); } }

Now I see error like below data error

2024-04-23T21:41:50.767-04:00 ERROR 16236 --- [JE-HW-Account] [nio-8081-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.RuntimeException: account not there in db] with root cause java.lang.RuntimeException: account not there in db at com.je.service.AccountService.lambda$0(AccountService.java:19) ~[classes/:na] at java.base/java.util.Optional.orElseThrow(Optional.java:403) ~[na:na] at com.je.service.AccountService.fetchAccountDetails(AccountService.java:19) ~[classes/:na] at com.je.controllers.AccountController.fetchAccountDetails(AccountController.java:45) ~[classes/:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:255) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:188) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:925) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:830) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) ~[spring-webmvc-6.1.5.jar:6.1.5] at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) ~[tomcat-embed-core-10.1.19.jar:6.0] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.1.5.jar:6.1.5] at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.19.jar:6.0] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:109) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
I do see that data

How is Spring JPA to know that a field named customerId is mapped to a column named customer_id?

Use the @Column annotation to map the field to the correct column.

Ah got it. Thank you. Let me try once i am able to get to that personal laptop today.

If distributed in multiple JVMs how to debug these type of issues. What are best practices in naming conventions, debugging, avoiding, finding root causes of these type of issues which i have pattern of making similar ones again and again

When debugging a client and server application simultaneously, I typically just open two separate instances of my IDE and attach each one to a different JVM process.

There are two important pieces of advice I can give you: First, learn how to read log files and stack traces. Second, learn how the debugger works by stepping through your application and experimenting with the call stack and watched variables.

For naming conventions, have your code reviewed by experienced programmers, such as the fine members of the CodeRanch.

Other than that, a lot of expertise really comes from making the same mistakes over and over until you learn not to make them anymore.

Thank you.

When I am trying to start intellij standard free edition server on my laptop now I am getting below error. Trying to resolve this.
Error: Could not find or load main class com.je.JeHwAccountApplication
Caused by: java.lang.ClassNotFoundException: com.je.JeHwAccountApplication

After doing maven install now this server issue resolved and started


I added @column customer_id

still getting below error


Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Wed Apr 24 21:35:39 EDT 2024
There was an unexpected error (type=Internal Server Error, status=500).





2024-04-24T21:35:39.518-04:00  INFO 19076 --- [JE-HW-Account] [nio-8081-exec-1] com.je.controllers.AccountController     : acct controler ->fetchAccountDetails1
2024-04-24T21:35:39.737-04:00 ERROR 19076 --- [JE-HW-Account] [nio-8081-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.RuntimeException: account not there in db] with root cause

java.lang.RuntimeException: account not there in db
at com.je.service.AccountService.lambda$0(AccountService.java:19) ~[classes/:na]
at java.base/java.util.Optional.orElseThrow(Optional.java:403) ~[na:na]
at com.je.service.AccountService.fetchAccountDetails(AccountService.java:19) ~[classes/:na]
at com.je.controllers.AccountController.fetchAccountDetails(AccountController.java:31) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:255) ~[spring-web-6.1.5.jar:6.1.5]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:188) ~[spring-web-6.1.5.jar:6.1.5]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118) ~[spring-webmvc-6.1.5.jar:6.1.5]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:925) ~[spring-webmvc-6.1.5.jar:6.1.5]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:830) ~[spring-webmvc-6.1.5.jar:6.1.5]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.1.5.jar:6.1.5]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.1.5.jar:6.1.5]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.1.5.jar:6.1.5]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.1.5.jar:6.1.5]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) ~[spring-webmvc-6.1.5.jar:6.1.5]
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) ~[tomcat-embed-core-10.1.19.jar:6.0]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.1.5.jar:6.1.5]
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.19.jar:6.0]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.19.jar:10.1.19]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.1.5.jar:6.1.5]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.1.5.jar:6.1.5]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:109) ~[spring-web-6.1.5.jar:6.1.5]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.1.5.jar:6.1.5]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]

I put debug break point in controller class then service class then repository class.

I tried to start application in debug mode but I do not see that option

I put log statement in Controller and SErvice which are prinitng 1 as well as below. But in repository layer failing. How to print the query the is being executed?

package com.je.controllers; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.je.entities.Account; import com.je.service.AccountService; import lombok.extern.slf4j.Slf4j; @RestController @Slf4j @RequestMapping("/api/v1/accounts") public class AccountController { @Autowired private AccountService accountService; @GetMapping("/{customerId}") public Account fetchAccountDetails(@PathVariable("customerId") int customerId) { log.info("acct controler ->fetchAccountDetails{}",customerId); return accountService.fetchAccountDetails(customerId); } } package com.je.service; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.je.controllers.AccountController; import com.je.entities.Account; //import com.je.entities.Product; import com.je.repository.AccountRepository; import lombok.extern.slf4j.Slf4j; @Slf4j @Service public class AccountService { @Autowired private AccountRepository accountRepository; public Account fetchAccountDetails(int customerId) { // TODO Auto-generated method stub log.info("acct service ->fetchAccountDetails{}",customerId); return accountRepository.findById(customerId) .orElseThrow(()-> new RuntimeException("account not there in db")); } } package com.je.repository; import java.util.Optional; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.stereotype.Repository; import com.je.entities.Account; @Repository //optional public interface AccountRepository extends JpaRepository<Account, Integer>{ Optional<Account> findByCustomerId(Integer customerId); }

Please advise

I printed the SQL as below by including below line application.properties file
spring.jpa.show-sql=true

Also in boot debugger view I am able to start server in debug mode as well
Looks like query expecting account_number not customer Id. Please advise

2024-04-27T15:10:45.483-04:00  INFO 24352 --- [JE-HW-Account] [nio-8081-exec-1] com.je.service.AccountService            : acct service ->fetchAccountDetails1 [b]Hibernate: select a1_0.account_number,a1_0.account_type,a1_0.branch_address,a1_0.create_dt,a1_0.customer_id from account a1_0 where a1_0.account_number=?[/b] 2024-04-27T15:10:53.587-04:00 ERROR 24352 --- [JE-HW-Account] [nio-8081-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.RuntimeException: account not there in db] with root cause java.lang.RuntimeException: account not there in db at com.je.service.AccountService.lambda$0(AccountService.java:23) ~[classes/:na] at java.base/java.util.Optional.orElseThrow(Optional.java:403) ~[na:na] at com.je.service.AccountService.fetchAccountDetails(AccountService.java:23) ~[classes/:na] at com.je.controllers.AccountController.fetchAccountDetails(AccountController.java:31) ~[classes/:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:255) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:188) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:925) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:830) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.1.5.jar:6.1.5] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) ~[spring-webmvc-6.1.5.jar:6.1.5] at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) ~[tomcat-embed-core-10.1.19.jar:6.0] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.1.5.jar:6.1.5] at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.19.jar:6.0] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:109) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.1.5.jar:6.1.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) ~[tomcat-embed-core-10.1.19.jar:10.1.19] at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]



Loans worked as attached

package com.je; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class JeHwLoansApplication { public static void main(String[] args) { SpringApplication.run(JeHwLoansApplication.class, args); } } package com.je.controllers; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.je.entities.Loans; import com.je.repository.LoansRepository; import lombok.AllArgsConstructor; import lombok.extern.slf4j.Slf4j; @RestController @AllArgsConstructor @Slf4j @RequestMapping("/api/v1/loans") public class LoansController { @Autowired private LoansRepository loansRepository; /* * @PostMapping public Loans CreateProduct(@RequestBody Loans product) { return * loansService.createProduct(product); } * * @GetMapping("/fetch/{id}") public Loans fetchProduct(@PathVariable Integer * id) { return loansService.fetchProduct(id); } * * @PutMapping("/update/{id}") public Loans updateProduct(@PathVariable Integer * id,@RequestBody Loans product) { return * loansService.updateProduct(id,product); } * * @DeleteMapping("/delete/{id}") public void * deleteProduct(@PathVariable(value="id") Integer productId) { * loansService.deleteProduct(productId); } */ @GetMapping("/fetch/{customerId}") public List<Loans> fetchLoansDetails(@PathVariable("customerId") int customerId) { log.info("loans controler ->fetchLoansDetails{}",customerId); List<Loans> loans = loansRepository.findByCustomerId(customerId); if(loans!=null) { return loans; } else { return null; } } } package com.je.entities; import java.sql.Date; import jakarta.persistence.Entity; import jakarta.persistence.GeneratedValue; import jakarta.persistence.GenerationType; import jakarta.persistence.Id; import lombok.Getter; import lombok.Setter; @Entity @Setter @Getter public class Loans { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer loanNumber; private Integer customerId; private Date startDt; private String loanType; private Integer totalLoan; private Integer amountPaid; private Integer outstandingAmount; private String createDt; } package com.je.repository; import java.util.List; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.stereotype.Repository; import com.je.entities.Loans; @Repository //optional public interface LoansRepository extends JpaRepository<Loans, Integer>{ //List<Loans> findByCustomerId(int customerId); List<Loans> findByCustomerId(int customerId); } spring.application.name=JE-HW-Loans server.port=8099 spring.datasource.url=jdbc:h2:mem:loansdb spring.datasource.username=loans spring.datasource.password=loan123 spring.h2.console.enabled=true spring.jpa.hibernate.ddl-auto=none management.endpoints.web.exposure.include=* DROP TABLE IF EXISTS loans; CREATE TABLE `loans` (  `loan_number` int NOT NULL AUTO_INCREMENT,  `customer_id` int NOT NULL,  `start_dt` date NOT NULL,  `loan_type` varchar(100) NOT NULL,  `total_loan` int NOT NULL,  `amount_paid` int NOT NULL,  `outstanding_amount` int NOT NULL,  `create_dt` date DEFAULT NULL,  PRIMARY KEY (`loan_number`) ); INSERT INTO `loans` ( `customer_id`, `start_dt`, `loan_type`, `total_loan`, `amount_paid`, `outstanding_amount`, `create_dt`) VALUES ( 1, '2020-10-13', 'Home', 200000, 50000, 150000, '2020-10-13'); INSERT INTO `loans` ( `customer_id`, `start_dt`, `loan_type`, `total_loan`, `amount_paid`, `outstanding_amount`, `create_dt`) VALUES ( 1, '2020-06-06', 'Vehicle', 40000, 10000, 30000, '2020-06-06'); INSERT INTO `loans` ( `customer_id`, `start_dt`, `loan_type`, `total_loan`, `amount_paid`, `outstanding_amount`, `create_dt`) VALUES ( 1, '2021-02-14', 'Home', 50000, 10000, 40000, '2018-02-14'); INSERT INTO `loans` ( `customer_id`, `start_dt`, `loan_type`, `total_loan`, `amount_paid`, `outstanding_amount`, `create_dt`) VALUES ( 1, '2018-02-14', 'Personal', 10000, 3500, 6500, '2018-02-14');

Also cards worked as below, attached.  Both cards and loans working does not have service layer. Accounts not working has service layer not sure any issue with that


package com.je; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class JeHwCardsApplication { public static void main(String[] args) { SpringApplication.run(JeHwCardsApplication.class, args); } } package com.je.controllers; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.je.entities.Cards; import com.je.repository.CardsRepository; //import com.je.service.CardsService; import lombok.extern.slf4j.Slf4j; @RestController @Slf4j @RequestMapping("/api/v1/cards") public class CardsController { @Autowired private CardsRepository cardsRepository; /* * @PostMapping public Cards CreateCards(@RequestBody Cards product) { return * cardsService.createCards(product); } * * @GetMapping("/fetch/{id}") public Cards fetchCards(@PathVariable Integer id) * { return cardsService.fetchCards(id); } * * @PutMapping("/update/{id}") public Cards updateCards(@PathVariable Integer * id,@RequestBody Cards product) { return cardsService.updateCards(id,product); * } * * @DeleteMapping("/delete/{id}") public void * deleteProduct(@PathVariable(value="id") Integer productId) { * cardsService.deleteCards(productId); } */ @GetMapping("/fetch/{customerId}") public List<Cards> fetchCardDetails(@PathVariable("customerId") int customerId) { log.info("acct controler ->fetchCardDetails{}",customerId); List<Cards> cards= cardsRepository.findByCustomerId(customerId); return cards; } } package com.je.entities; import java.sql.Date; import jakarta.persistence.Entity; import jakarta.persistence.GeneratedValue; import jakarta.persistence.GenerationType; import jakarta.persistence.Id; import lombok.Getter; import lombok.Setter; @Entity @Setter @Getter public class Cards { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer cardId; private int customerId; private String cardNumber; private String cardType; private int totalLimit; private int amountUsed; private int availableAmount; private Date createDt; } package com.je.repository; import java.util.List; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.stereotype.Repository; import com.je.entities.Cards; @Repository //optional public interface CardsRepository extends JpaRepository<Cards, Integer>{ List<Cards> findByCustomerId(int customerId); } application.properties is spring.application.name=JE-HW-Cards server.port=9010 spring.datasource.url=jdbc:h2:mem:cardsdb spring.datasource.username=cards spring.datasource.password=cards123 spring.h2.console.enabled=true spring.jpa.hibernate.ddl-auto=none management.endpoints.web.exposure.include=* data.sql is DROP TABLE IF EXISTS cards; CREATE TABLE `cards` (  `card_id` int NOT NULL AUTO_INCREMENT,  `card_number` varchar(100) NOT NULL,  `customer_id` int NOT NULL,  `card_type` varchar(100) NOT NULL,  `total_limit` int NOT NULL,  `amount_used` int NOT NULL,  `available_amount` int NOT NULL,  `create_dt` date DEFAULT NULL,  PRIMARY KEY (`card_id`) ); INSERT INTO `cards` (`card_number`, `customer_id`, `card_type`, `total_limit`, `amount_used`, `available_amount`, `create_dt`) VALUES ('4565XXXX4656', 1, 'Credit', 10000, 500, 9500, CURDATE()); INSERT INTO `cards` (`card_number`, `customer_id`, `card_type`, `total_limit`, `amount_used`, `available_amount`, `create_dt`) VALUES ('3455XXXX8673', 1, 'Credit', 7500, 600, 6900, CURDATE()); INSERT INTO `cards` (`card_number`, `customer_id`, `card_type`, `total_limit`, `amount_used`, `available_amount`, `create_dt`) VALUES ('2359XXXX9346', 1, 'Credit', 20000, 4000, 16000, CURDATE());

I will try to  remember not to edit posts. Mostly I am editing to correct typos and attach forgotten images. I updated my code as below by removing customerId variable reference and adding accountNumber variable as reference as dealing with accounts here. Below is the query generated by intellij idea when i put hibernate query as true in configuration


select a1_0.account_number,a1_0.account_type,a1_0.branch_address,a1_0.create_dt,a1_0.customer_id from account a1_0 where a1_0.account_number=1

I get below same error no records found in database as below
2024-04-28T09:28:53.210-04:00  INFO 20120 --- [JE-HW-Account] [on(7)-127.0.0.1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet' 2024-04-28T09:28:53.211-04:00  INFO 20120 --- [JE-HW-Account] [on(7)-127.0.0.1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet' 2024-04-28T09:28:53.215-04:00  INFO 20120 --- [JE-HW-Account] [on(7)-127.0.0.1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 4 ms 2024-04-28T09:28:56.509-04:00  INFO 20120 --- [JE-HW-Account] [nio-8081-exec-1] com.je.controllers.AccountController     : acct controler ->fetchAccountDetails1 2024-04-28T09:29:08.645-04:00  INFO 20120 --- [JE-HW-Account] [nio-8081-exec-2] com.je.controllers.AccountController     : acct controler ->fetchAccountDetails1 2024-04-28T09:29:17.048-04:00  INFO 20120 --- [JE-HW-Account] [nio-8081-exec-1] com.je.service.AccountService            : acct service ->fetchAccountDetails1 Hibernate: select a1_0.account_number,a1_0.account_type,a1_0.branch_address,a1_0.create_dt,a1_0.customer_id from account a1_0 where a1_0.account_number=? 2024-04-28T09:37:46.321-04:00 ERROR 20120 --- [JE-HW-Account] [nio-8081-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.RuntimeException: account NUMBER not there in db] with root cause java.lang.RuntimeException: account NUMBER not there in db at com.je.service.AccountService.lambda$0(AccountService.java:23) ~[classes/:na] at java.base/java.util.Optional.orElseThrow(Optional.java:403) ~[na:na] at com.je.service.AccountService.fetchAccountDetails(AccountService.java:23) ~[classes/:na] at com.je.controllers.AccountController.fetchAccountDetails(AccountController.java:33) ~[classes/:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:255) ~[spring-web-6.1.5.jar:6.1.5]


When I try to execute same query in h2o console there also i get results found even though there is record with account number 1 as attached when I use below query

SELECT * FROM ACCOUNT

My complete updated code of this accounts micro service as below. Please advise
package com.je; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class JeHwAccountApplication { public static void main(String[] args) { SpringApplication.run(JeHwAccountApplication.class, args); } } package com.je.controllers; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.je.entities.Account; import com.je.service.AccountService; import lombok.AllArgsConstructor; import lombok.extern.slf4j.Slf4j; @RestController @AllArgsConstructor @Slf4j @RequestMapping("/api/v1/accounts") public class AccountController { @Autowired private AccountService accountService; @GetMapping("/{accountNumber}") public Account fetchAccountDetails(@PathVariable("accountNumber") int accountNumber) { log.info("acct controler ->fetchAccountDetails{}",accountNumber); return accountService.fetchAccountDetails(accountNumber); } } package com.je.controllers; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.je.entities.Account; import com.je.service.AccountService; import lombok.AllArgsConstructor; import lombok.extern.slf4j.Slf4j; @RestController @AllArgsConstructor @Slf4j @RequestMapping("/api/v1/accounts") public class AccountController { @Autowired private AccountService accountService; @GetMapping("/{accountNumber}") public Account fetchAccountDetails(@PathVariable("accountNumber") int accountNumber) { log.info("acct controler ->fetchAccountDetails{}",accountNumber); return accountService.fetchAccountDetails(accountNumber); } } package com.je.repository; import java.util.Optional; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.stereotype.Repository; import com.je.entities.Account; @Repository //optional public interface AccountRepository extends JpaRepository<Account, Integer>{ Optional<Account> findById(Integer accountNumber); }package com.je.service; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.je.controllers.AccountController; import com.je.entities.Account; //import com.je.entities.Product; import com.je.repository.AccountRepository; import lombok.extern.slf4j.Slf4j; @Slf4j @Service public class AccountService { @Autowired private AccountRepository accountRepository; public Account fetchAccountDetails(int accountNumber) { // TODO Auto-generated method stub log.info("acct service ->fetchAccountDetails{}",accountNumber); return accountRepository.findById(accountNumber) .orElseThrow(()-> new RuntimeException("account NUMBER not there in db")); } } spring.application.name=JE-HW-Account server.port=8081 spring.datasource.url=jdbc:h2:mem:accountsdb spring.datasource.username=accounts spring.datasource.password=admin spring.jpa.hibernate.ddl-auto=none spring.h2.console.enabled=true management.endpoints.web.exposure.include=* spring.jpa.show-sql=true DROP TABLE IF EXISTS customer; DROP TABLE IF EXISTS account; CREATE TABLE `customer` (  `customer_id` int AUTO_INCREMENT  PRIMARY KEY,  `name` varchar(100) NOT NULL,  `email` varchar(100) NOT NULL,  `mobile_number` varchar(20) NOT NULL,  `create_dt` date DEFAULT NULL ); CREATE TABLE `account` (  `customer_id` int NOT NULL,   `account_number` int AUTO_INCREMENT  PRIMARY KEY,  `account_type` varchar(100) NOT NULL,  `branch_address` varchar(200) NOT NULL,  `create_dt` date DEFAULT NULL ); INSERT INTO `customer` (`name`,`email`,`mobile_number`,`create_dt`) VALUES ('je','je@gmail.com','78010079',CURDATE()); INSERT INTO `account` (`customer_id`, `account_number`, `account_type`, `branch_address`, `create_dt`) VALUES (1, 501000, 'Current', '301 Main Street, nyc', CURDATE());

Thank you all for your help, guidance. It finally worked when I give account number value (instead of customerId) in the query as that is primary key. Latest working code, working screenshots attached

package com.je; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class JeHwAccountApplication { public static void main(String[] args) { SpringApplication.run(JeHwAccountApplication.class, args); } } package com.je.controllers; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.je.entities.Account; import com.je.service.AccountService; import lombok.AllArgsConstructor; import lombok.extern.slf4j.Slf4j; @RestController @AllArgsConstructor @Slf4j @RequestMapping("/api/v1/accounts") public class AccountController { @Autowired private AccountService accountService; @GetMapping("/{accountNumber}") public Account fetchAccountDetails(@PathVariable("accountNumber") int accountNumber) { log.info("acct controler ->fetchAccountDetails{}",accountNumber); return accountService.fetchAccountDetails(accountNumber); } } package com.je.entities; import java.time.LocalDate; import jakarta.persistence.Column; import jakarta.persistence.Entity; import jakarta.persistence.GeneratedValue; import jakarta.persistence.GenerationType; import jakarta.persistence.Id; import lombok.Getter; import lombok.Setter; @Entity @Setter @Getter public class Account { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "ACCOUNT_NUMBER") private Integer accountNumber; // @Column(name = "CUSTOMER_ID") private int customerId; private String accountType; private String branchAddress; private LocalDate createDt; } package com.je.repository; import java.util.Optional; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.stereotype.Repository; import com.je.entities.Account; @Repository //optional public interface AccountRepository extends JpaRepository<Account, Integer>{ Optional<Account> findById(Integer accountNumber); } package com.je.service; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.je.controllers.AccountController; import com.je.entities.Account; //import com.je.entities.Product; import com.je.repository.AccountRepository; import lombok.extern.slf4j.Slf4j; @Slf4j @Service public class AccountService { @Autowired private AccountRepository accountRepository; public Account fetchAccountDetails(int accountNumber) { // TODO Auto-generated method stub log.info("acct service ->findById{}",accountNumber); return accountRepository.findById(accountNumber) .orElseThrow(()-> new RuntimeException("account NUMBER not there in db")); } } spring.application.name=JE-HW-Account server.port=8081 spring.datasource.url=jdbc:h2:mem:accountsdb spring.datasource.username=accounts spring.datasource.password=admin spring.jpa.hibernate.ddl-auto=none spring.h2.console.enabled=true management.endpoints.web.exposure.include=* spring.jpa.show-sql=true DROP TABLE IF EXISTS customer; DROP TABLE IF EXISTS account; CREATE TABLE `customer` (  `customer_id` int AUTO_INCREMENT  PRIMARY KEY,  `name` varchar(100) NOT NULL,  `email` varchar(100) NOT NULL,  `mobile_number` varchar(20) NOT NULL,  `create_dt` date DEFAULT NULL ); CREATE TABLE `account` (  `customer_id` int NOT NULL,   `account_number` int AUTO_INCREMENT  PRIMARY KEY,  `account_type` varchar(100) NOT NULL,  `branch_address` varchar(200) NOT NULL,  `create_dt` date DEFAULT NULL ); INSERT INTO `customer` (`name`,`email`,`mobile_number`,`create_dt`) VALUES ('je','je@gmail.com','78010079',CURDATE()); INSERT INTO `account` (`customer_id`, `account_number`, `account_type`, `branch_address`, `create_dt`) VALUES (1, 501000, 'Current', '301 Main Street, nyc', CURDATE());

sai rama krishna wrote:I will try to  remember not to edit posts. Mostly I am editing to correct typos and attach forgotten images. . . .

That is not too bad; it doesn't usually cause confusion later.

I agree. Thank you.