NoSuchElementException- Application crashed

Android
1

Hi, I’m updating a list of a table’s objects, At First, It worked fine for like 4-5 time then it stops working. It gives an error “java.util.NoSuchElementException - at java.util.AbstractList$SimpleListIterator.next”,
It saves the object in database but aso gave the error,
kindly help me,
Here is my code for updating

final HelpComments comments = new HelpComments();
comments.setMessage(inputText.toString());
comments.setCreator(currentUser);
Backendless.Data.of(HelpComments.class).save(comments, new AsyncCallback<HelpComments>() {
    @Override
    public void handleResponse(HelpComments comment) {
        currentthread.addComment(comment);
        Log.d("time:",comment.getCreatedAt().toString());
        Backendless.Data.of(CommentThreads.class).save(currentthread, new AsyncCallback<CommentThreads>() {
            @Override
            public void handleResponse(CommentThreads response) {
                makeToast(inputText.toString());
                makeToast("Message Sent!");
            }
            @Override
            public void handleFault(BackendlessFault fault) {
                makeToast("Error! Failed to send!");
                Log.d("error:",fault.getMessage()+"\nError! Failed to send!\n"+fault.getDetail());
            }
        });
    }
    @Override
    public void handleFault(BackendlessFault fault) {
        makeToast("Error! Failed to send!");
    }
});

And here is the error


Process: com.example.mubtadanaqvi.stunexus, PID: 27815
java.util.NoSuchElementException
at java.util.AbstractList$SimpleListIterator.next(AbstractList.java:59)
at com.backendless.FootprintsManager$Inner.updateFootprintForObject(FootprintsManager.java:257)
at com.backendless.FootprintsManager$Inner.updateFootprintForObject(FootprintsManager.java:238)
at com.backendless.FootprintsManager$Inner.updateFootprintForObject(FootprintsManager.java:257)
at com.backendless.Persistence$4.handleResponse(Persistence.java:196)
at com.backendless.async.message.AsyncMessage$ResponseHandler.handle(AsyncMessage.java:64)
at com.backendless.async.message.AsyncMessage.handleCallback(AsyncMessage.java:41)
at com.backendless.core.AndroidCarrier$1.handleMessage(AndroidCarrier.java:37)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5487)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)

Here is CommentThread Class

package com.example.mubtadanaqvi.stunexus;

import android.util.Log;

import com.backendless.BackendlessUser;
import com.stfalcon.chatkit.commons.models.IDialog;
import com.stfalcon.chatkit.commons.models.IMessage;
import com.stfalcon.chatkit.commons.models.IUser;

import java.util.ArrayList;
import java.util.List;

import weborb.service.ExcludeProperties;

@ExcludeProperties( propertyNames = {"users","unreadCount","dialogName","dialogPhoto","lastMessage","id"})
public class CommentThreads implements IDialog
{
  private java.util.Date created;
  private String ownerId;
  private String objectId;
  private java.util.Date updated;
  private java.util.List<HelpComments> comments;
  private BackendlessUser helper;

  private int unRead=0;
  private String id;
  private String dialogPhoto;
  private String dialogName;
  private IMessage lastMessage;
  private List<IUser> usersList = new ArrayList<>();

  public java.util.Date getCreated()
  {
    return created;
  }
  public String getOwnerId()
  {
    return ownerId;
  }
  public String getObjectId()
  {
    return objectId;
  }
  public java.util.Date getUpdated()
  {
    return updated;
  }
  public java.util.List<HelpComments> getComments()
  {
    return comments;
  }
  public void setComments( java.util.List<HelpComments> comments )
  {
    this.comments = comments;
  }
  public void addComment(HelpComments comments){this.comments.add(0,comments);}
  public BackendlessUser getHelper()
  {
    return helper;
  }
  public void setHelper( BackendlessUser helper )
  {
    this.helper = helper;
  }


  @Override
  public String getId() {
    return getObjectId();
  }
  public void setId(String s){
    this.id=s;
  }
  @Override
  public String getDialogPhoto() {
    Log.d("test:",getHelper().getProperty("profileImage")+"");
    if (getHelper().getProperty("profileImage")==null)
      return null;
    else
      return getHelper().getProperty("profileImage").toString();
  }
  public void setDialogPhoto(String s){
    this.dialogPhoto=s;
  }
  @Override
  public String getDialogName() {
    return getHelper().getProperty("name").toString();
  }
  public void setDialogName(String s){
    this.dialogName=s;
  }
  @Override
  public List<IUser> getUsers() {
    return this.usersList;
  }
  public void setUsers(List<IUser> users){
      this.usersList=users;
  }
  @Override
  public IMessage getLastMessage() {
    if (getComments().size()>0)
      return getComments().get(0);
//      return getComments().get(getComments().size()-1);
    return null;
  }
  @Override
  public void setLastMessage(IMessage message) {
    this.lastMessage=message;
  }
  @Override
  public int getUnreadCount() {
    return unRead;
  }
  public void setUnreadCount(int i){
      this.unRead=i;
  }

  public void addUser(IUser user){
    this.usersList.add(user);
  }
}

and Here is HelpComments-Class

package com.example.mubtadanaqvi.stunexus;

import android.util.Log;

import com.backendless.BackendlessUser;
import com.stfalcon.chatkit.commons.models.IMessage;
import com.stfalcon.chatkit.commons.models.IUser;

import java.util.Date;

import weborb.service.ExcludeProperties;

@ExcludeProperties( propertyNames = {"createdAt","id","text","user"})
public class HelpComments implements IMessage
{
  private String message;
  private String ownerId;
  private String objectId;
  private java.util.Date created;
  private java.util.Date updated;
  private BackendlessUser creator;


  private String id;
  private String text;
  private IUser user;
  private Date date;

  public String getMessage()
  {
    return message;
  }
  public void setMessage( String message )
  {
    this.message = message;
  }
  public String getOwnerId()
  {
    return ownerId;
  }
  public String getObjectId()
  {
    return objectId;
  }
  public java.util.Date getCreated()
  {
    return created;
  }
  public java.util.Date getUpdated()
  {
    return updated;
  }
  public BackendlessUser getCreator()
  {
    return creator;
  }
  public void setCreator( BackendlessUser creator )
  {
    this.creator = creator;
  }

  @Override
  public String getId() {
    return getObjectId();
  }
  public void setId(String s){
    this.id=s;
  }
  @Override
  public String getText() {
    return getMessage();
  }
  public void setText(String s){
    this.text=s;
  }
  public void setUser(IUser user){
      this.user=user;
  }
  @Override
  public IUser getUser() {
    DialogAuthor a= new DialogAuthor();
    a.setName(getCreator().getProperty("name").toString());
//    if (getCreator().getProperty("profileImage")==null)
      a.setAvtar(null);
//    else
//      a.setAvtar(getCreator().getProperty("profileImage").toString());
    Log.d("avtarNew:",getCreator().getProperty("profileImage").toString());
    a.setId(getCreator().getObjectId());
    return a;
  }
  public void setCreatedAt(Date date){
    this.date=date;
  }
  @Override
  public Date getCreatedAt() {
    return getCreated();
  }
}
2

This error is known to happen when you have circular references in the data structures. For example, a Comment object references a User and a User references the Comment. From the code you posted earlier, this is what you have in your data structure. I recommend rethinking object relations in your app and simplify how they are established. It looks like you’re over-engineering the solution.

Regards,
Mark

3

Thanks, It works.