Swapnil Mishra

working, thank you!

1 week ago

Someone please help

2 weeks ago

Here is my Customer Controller Class

package com.swapnil.springbooth2db.controller;
import java.util.List;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
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.swapnil.springbooth2db.entity.Customer;
import com.swapnil.springbooth2db.repository.ICustomerRepo;
@RestController
@RequestMapping("/api")
public class CustomerController {
@Autowired
ICustomerRepo customerRepo;
@GetMapping("/customers")
public ResponseEntity<List<Customer>> getAllCustomers() {
try {
List<Customer> list = customerRepo.findAll();
if (list.isEmpty() || list.size() == 0) {
return new ResponseEntity<>(HttpStatus.NO_CONTENT);
}
return new ResponseEntity<>(list, HttpStatus.OK);
} catch (Exception e) {
return new ResponseEntity<>(null, HttpStatus.INTERNAL_SERVER_ERROR);
}
}
@GetMapping("/customers/{id}")
public ResponseEntity<Customer> getCustomer(@PathVariable Long id) {
Optional<Customer> customer = customerRepo.findById(id);
if (customer.isPresent()) {
return new ResponseEntity<>(customer.get(), HttpStatus.OK);
}
return new ResponseEntity<>(HttpStatus.NOT_FOUND);
}
@PostMapping("/customers")
public ResponseEntity<Customer> saveCustomer(@RequestBody Customer customer) {
try {
return new ResponseEntity<>(customerRepo.save(customer), HttpStatus.CREATED);
} catch (Exception e) {
return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
}
}
@PutMapping("/customers")
public ResponseEntity<Customer> updateCustomer(@RequestBody Customer customer) {
try {
return new ResponseEntity<>(customerRepo.save(customer), HttpStatus.OK);
} catch (Exception e) {
return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
}
}
@DeleteMapping("/customers/{id}")
public ResponseEntity<HttpStatus> deleteCustomer(@PathVariable Long id) {
try {
Optional<Customer> customer = customerRepo.findById(id);
if (customer.isPresent()) {
customerRepo.delete(customer.get());
}
return new ResponseEntity<>(HttpStatus.NO_CONTENT);
} catch (Exception e) {
return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
}
}
}

2 weeks ago

I have created REST APIs to do CRUD Operations

To test the API in postman, when I enter the JSON Below

I get this error :

{
   "timestamp": "2024-05-18T01:02:51.362+00:00",
   "status": 404,
   "error": "Not Found",
   "trace": "org.springframework.web.servlet.resource.NoResourceFoundException: No static resource customers.\r\n\tat org.springframework.web.servlet.resource.ResourceHttpRequestHandler.handleRequest(ResourceHttpRequestHandler.java:585)\r\n\tat org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:52)\r\n\tat org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089)\r\n\tat org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979)\r\n\tat org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)\r\n\tat org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903)\r\n\tat jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)\r\n\tat org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)\r\n\tat jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:206)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:150)\r\n\tat org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:175)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:150)\r\n\tat org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:175)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:150)\r\n\tat org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:175)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:150)\r\n\tat org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:175)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:150)\r\n\tat org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)\r\n\tat org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)\r\n\tat org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)\r\n\tat org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115)\r\n\tat org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)\r\n\tat org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)\r\n\tat org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)\r\n\tat org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391)\r\n\tat org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)\r\n\tat org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896)\r\n\tat org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1736)\r\n\tat org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)\r\n\tat org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)\r\n\tat org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)\r\n\tat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)\r\n\tat java.base/java.lang.Thread.run(Thread.java:840)\r\n",
   "message": "No static resource customers.",
   "path": "/customers"
}

2 weeks ago

First occurrence of an Element in an Array

Carey Brown wrote:Could you please describe, in English, the algorithm you are trying to implement. Part of it looks like a binary search algorithm but that won't work in your case because the array is not sorted.

Yes you are right , here the condition is that the user inputs elements into ascending order (I forgot to mention this prerequisite) and yes this indeed is almost a binary search algo

2 weeks ago

First occurrence of an Element in an Array

I understand that it is as same as binary search only difference here is that even after finding the key/target element we still continue our search to the left of the array, (because it is sorted in ascending order and the very first occurrence will obviously be to the leftmost side of an array) I just want to know how do we do this..

2 weeks ago

First occurrence of an Element in an Array

I am Finding 1st occurrence of an Element in an Array

But I want to follow this specific approach :

package Leetcode;
import java.util.*;
public class Sample{
   public static void main(String[] args) {
           Scanner input=new Scanner(System.in);
           System.out.print("Array Length: ");
           int n;
           int[] arr=new int[n=input.nextInt()];
           System.out.print("Start feeding elements and hit enter one by one: ");
           for(int a=0;a<=arr.length-1;a++){
               arr[a]=input.nextInt();
           }
           System.out.println("Elements of your array are as follows:");
           for(int z:arr){
               System.out.println(z);
           }
         
           System.out.print("Find Element: ");
           int t=input.nextInt();
           int low=0; int high=arr.length-1;
           int result = -1;
           while(low<=high){
               int (mid=low+(high-low)/2);
               if(t==arr[mid]){
                   high=mid-1
                          //till here my code is valid
                           /*now I want to continue my search to the left of the array
                           I am confused how to proceed from here
                           */
               }
           }
   }
}

SideNote : Most of the people have done it via parameterized method, and I have understood that solution and have no problem with that nor do I claim that this approach is better, it's just that I want to do it in this way, please let me know if it's possible, if yes, please help showing how.

2 weeks ago

okok

3 weeks ago

Also, I don't see this @Entity annotation from org.hibernate.annotations, does that mean I have not included hibernate dependency in my xml file??, despite adding this code snippet :

3 weeks ago

ok, Thank you

3 weeks ago

This is my xml file :

I have added dependencies of H2 database and Hibernate in my file

to add Hibernate dependency I went to hibernate's homepage hibernate.org and from there followed this getting started guide
of how to Obtain Hibernate using Maven Dependency which showed me the code snippet, I added this snippet inside my dependency tag in my xml file

And to add H2 database dependency I took help of mvnrepository.com

Did I do it right ??

3 weeks ago

I mean yea, I know how to do it, Just want to know if I am doing it right or not?

3 weeks ago

please tell me how do I add hibernate dependency? in POM.xml file

3 weeks ago

Whenever I am trying to get suggestions of @Entity annotation in Spring Tool Suit, I am just not finding it , be it suggestion from javax.persistence, or from org.hibernate.annotations,

I even have Hibernate dependency in my pom.xml

3 weeks ago

Sorting an Array in my own way.

ok,

1 month ago