Ng Sharma

Tim Holloway wrote:A "500" error is a server-side error. You should have a stack trace and we need to see it before we can offer much in the way of help.

It's only throw 500 internal error

Every time I try to send a post request, I get 500 error.Post request via postman works fine too, so there is no problems on the server side. What is the Mistake?

Controller

package com.neostencil.services; import com.neostencil.leadsquard.LeadCapture; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Value; import org.springframework.http.*; import org.springframework.stereotype.Service; import org.springframework.util.LinkedMultiValueMap; import org.springframework.util.MultiValueMap; import org.springframework.web.client.RestTemplate; import org.springframework.web.util.UriComponentsBuilder; @Service public class LeadSquardService {  private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());  @Value("${leadsquard.accesskey}")  private String access_key;  @Value("${leadsquard.secretkey}")  private String serect_key;  /**   * Create a New User in Lead Capture.   * @param leadCapture   * */  public void createNewUserInLeadCapture(LeadCapture leadCapture) {    MultiValueMap<String, String> mapdata = new LinkedMultiValueMap<>();    mapdata.add("FirstName", leadCapture.getFirstName());    mapdata.add("Phone", "");    mapdata.add("EmailAddress", leadCapture.getEmailAddress());    mapdata.add("mx_Courses", leadCapture.getMx_courses());    UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl("hostUrl");    builder.queryParam("accessKey" , access_key );    builder.queryParam("secretKey", serect_key);    HttpHeaders headers = new HttpHeaders();    headers.setContentType(MediaType.APPLICATION_JSON);    //headers.set("Accept", MediaType.APPLICATION_JSON_VALUE);    try {      HttpEntity<MultiValueMap<String,String>> requestEntity = new HttpEntity<>(mapdata, headers);      RestTemplate restTemplate = new RestTemplate();      ResponseEntity<String> response = restTemplate.exchange(builder.build().toUriString(), HttpMethod.POST, requestEntity, String.class);      HttpStatus statusCode = response.getStatusCode();      if (statusCode == HttpStatus.ACCEPTED) {        System.out.println("ResponseEntity : " + response.getBody());      }    } catch (Exception e) {        e.printStackTrace();    }  } }

I'm try hit url using ajax but it not working.

Javascript File

function updateLeadSquaredCapturing(){    var leadDetails = {          firstName    : parseJwt(getAuthToken()).name,          phone        : String(userMobileNumber),          emailAddress : parseJwt(getAuthToken()).emailId,          mx_courses   : segmentList    }    alert(JSON.stringify(leadDetails));    $.ajax({            url: apiBasePath + "/create/user/leadcapture",            data: JSON.stringify(leadDetails),            type: "POST",            contentType: "application/json",            dataType: "text",            success: function (response) {            alert("Success  "+ JSON.stringify(response));              console.log('success');            },            error: function (response) {              alert("Error   "+JSON.stringify(response));                console.log('fail.');            }          }); }

Controller

@RestController @RequestMapping({"/api/v1"}) public class LeadController {    @PostMapping("/create/user/leadcapture")    @ResponseBody public String createLeadCapture(@Valid @RequestBody LeadCapture capture) {      System.out.println("Name : " +  capture.getFirstName());      System.out.println("Email : " + capture.getEmailAddress());      System.out.println("ToString : " + capture);      return "Successful";    } }

LeadCapture Class
public class LeadCapture {  private String firstName;  private String mobileno;  private String emailAddress;  private String mx_courses;  /**Getter And Setter*/ }

I have written this code.
package com.oca.collection; import java.util.*; public class TestColleciton {    public static void main(String[] args)  {        HashMap<String, String> hashMap = new HashMap<>();        hashMap.put("1990", "Superman");        hashMap.put("1995", "Darkseid");        Map<String, String> map = Collections.synchronizedMap(hashMap);        new Thread(() -> {            try {                Thread.sleep(2000);            } catch (InterruptedException ie) {}            System.out.println("Child Thread Update");            map.put("1996", "Spiderman");            System.out.println(Thread.currentThread().getName() + " : " + map);        }).start(); /*        Set<Map.Entry<String, String>> entries = map.entrySet();        Iterator<Map.Entry<String, String>> itr = entries.iterator();                                                                         _        while (itr.hasNext()) {                                  |            Thread.sleep(3000);                                |        <--This Area Generated ConCurrentModificationException. Okay fine.            System.out.println(itr.next().getKey());    |          }*/                                                             _ /** * In this Area is not Generated ConCurrentModificationException Why..? **/        map.forEach( (k,v) -> {            try {                Thread.sleep(3000);                System.out.println("[Key : " + k + ", Value : " + v +"]");            } catch (InterruptedException ie) {}        } );    } }

https://stackoverflow.com/questions/2506488/when-is-the-finalize-method-called-in-java

jar -cfe jarDirectory/jarfileName.jar -C binDirectory/moduleName  .

c  = create
f  = fileName
e = main Class path
-C = where you create a jar file (Directory).
. = current Directory

Best Answer:
https://stackoverflow.com/questions/25169175/why-are-class-static-methods-inherited-but-not-interface-static-methods

this code write my self.

Program : 1
interface Parent {    public static void doStuff() {} } class Child implements Parent {    public void doStuff() {} <-- Override a static method here, but does not generated any compile-time error. }

Program : 2
class Parent {    public static void doStuff() {} } class Child extends Parent {    public void doStuff() {} <-- but here genereated compiler time error. }

I know the rule of Program :2, but Program : 1 rule not know.
Please suggest me and correct me.

finally i gotted thanks you again @Campbell Ritchie & @Stephan van Hulst

but compiler by default treated Integral value is int.

own code.

public class TernayOperator  { public static void main(String[] args) { byte b = 5; short s = 10; int i = 15; long l = 20; float f = 10.5f; double d = 1.5; boolean z = true; Object  obj = z ? 'X' : b;  <--- doubted line, this line why not returning a java.lang.Character class. System.out.println(obj.getClass().getName()); obj = z ? 'X' : s; System.out.println(obj.getClass().getName()); obj = z ? 'X' : i; System.out.println(obj.getClass().getName()); obj = z ? 'X' : l; System.out.println(obj.getClass().getName()); obj = z ? 'X' : f; System.out.println(obj.getClass().getName()); obj = z ? 'X' : d; System.out.println(obj.getClass().getName()); //Different Case obj = z ? 'X' : 0; <-- but this line returning a Character class Why? this line is not returning a Integer class.? System.out.println(obj.getClass().getName()); } }

Please anyone suggest me and correct me.. I'm little bit confusion.

Campbell Ritchie wrote:Please always say where such questions come from. It looks familiar to me. As you know, 'X' is the same as (char)0x58, which comes to 88 in decimal. The Java® Language Specification should give you that answer. Yes, it does. It tells you how the type of the whole expression depends on its middle and right operands.

Thank you..!

char x = 'X'; int i = 0; System.out.println(true ? x : 0); <--  this line print X Why..? can you explain..?   System.out.println(false ? i : x); <-- this line print 88. it fine .

Junilu Lacar wrote:

Stephan van Hulst wrote:Where are you getting your information from? That's wrong.

And this shows how:
class Main {  public static void main(String[] args) {    byte n = 127;    System.out.println(++n);    System.out.println(--n);  } }

like this.
Integer i = Integer.MAX_VALUE + 1; <-- this line show warning numeric overflow in expression. Short s = Short.MAX_VALUE + 1; <-- this line show Compiler time error: Incomptable type.

Stephan van Hulst wrote:int (and by extension, Integer) wrap around to Integer.MIN_VALUE when they overflow, and Integer.MAX_VALUE when they underflow. Why? Because that's what the language designers decided they should do. It's likely that this behavior carried over from older languages, such as C++.

Wrap around only applied in Integer, Long, Float and Double. But not applied in Byte and Short,Why ..?