Program: 70545
Project: 70545
Buggy source:
@Override protected void onCreate(Bundle savedInstanceState){
  super.onCreate(savedInstanceState);
  bind=DataBindingUtil.setContentView(this,R.layout.activity_post_detail);
  db=FirebaseDatabase.getInstance();
  auth=FirebaseAuth.getInstance();
  Intent i=getIntent();
  if (i != null) {
    bind.nickname.setText(i.getStringExtra(EXTRA_NAME));
    bind.date.setText(i.getStringExtra(EXTRA_DATE));
    bind.content.setText(i.getStringExtra(EXTRA_CONTENT));
    ownerId=i.getStringExtra(EXTRA_OWNER_ID);
    postId=i.getStringExtra(EXTRA_ID);
    bind.like.setText(getResources().getString(R.string.like_cnt,i.getLongExtra(EXTRA_LIKE,0)));
    bind.comment.setText(getResources().getString(R.string.comment_cnt,i.getLongExtra(EXTRA_COMMENT,0)));
    bind.view.setText(getResources().getString(R.string.view_cnt,i.getLongExtra(EXTRA_VIEW,0)));
    String photo=i.getStringExtra(EXTRA_OWNER_PHOTO_URL);
    if (photo != null)     Picasso.with(this).load(photo).into(bind.photo);
    db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").addListenerForSingleValueEvent(new ValueEventListener(){
      @Override public void onDataChange(      DataSnapshot dataSnapshot){
        for (        DataSnapshot snap : dataSnapshot.getChildren())         if (auth.getCurrentUser().getUid().equals((String)snap.getValue()))         return;
        db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").push().setValue(auth.getCurrentUser().getUid());
        db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").addListenerForSingleValueEvent(new ValueEventListener(){
          @Override public void onDataChange(          DataSnapshot dataSnapshot){
            final long x=(long)dataSnapshot.getValue() + 1;
            db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").setValue(x).addOnCompleteListener(new OnCompleteListener<Void>(){
              @Override public void onComplete(              @NonNull Task<Void> task){
                bind.view.setText(getResources().getString(R.string.view_cnt,x));
                updateResult();
              }
            }
);
          }
          @Override public void onCancelled(          DatabaseError databaseError){
          }
        }
);
      }
      @Override public void onCancelled(      DatabaseError databaseError){
      }
    }
);
  }
  bind.nickname.setOnClickListener(onClickShowUser);
  bind.photo.setOnClickListener(onClickShowUser);
  dialogComments=CommentsDialog.getDialog(postId);
  dialogComments.setCallback(new CommentsDialog.OnCloseListener(){
    @Override public void onClose(){
      updateResult();
    }
  }
);
  dialogLikes=LikesDialog.getDialogInstance(postId);
  bind.like.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").addListenerForSingleValueEvent(new ValueEventListener(){
        @Override public void onDataChange(        DataSnapshot dataSnapshot){
          for (          DataSnapshot snap : dataSnapshot.getChildren())           if (auth.getCurrentUser().getUid().equals((String)snap.getValue()))           return;
          db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").push().setValue(auth.getCurrentUser().getUid());
          db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").addListenerForSingleValueEvent(new ValueEventListener(){
            @Override public void onDataChange(            DataSnapshot dataSnapshot){
              final long x=(long)dataSnapshot.getValue() + 1;
              db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").setValue(x).addOnCompleteListener(new OnCompleteListener<Void>(){
                @Override public void onComplete(                @NonNull Task<Void> task){
                  bind.like.setText(getResources().getString(R.string.like_cnt,x));
                  updateResult();
                }
              }
);
            }
            @Override public void onCancelled(            DatabaseError databaseError){
            }
          }
);
        }
        @Override public void onCancelled(        DatabaseError databaseError){
        }
      }
);
    }
  }
);
  bind.showComments.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      dialogComments.show(getSupportFragmentManager(),"String_Node_Str");
    }
  }
);
  bind.showLikes.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      dialogLikes.show(getSupportFragmentManager(),"String_Node_Str");
    }
  }
);
}

Fixed version (ground truth):
@Override protected void onCreate(Bundle savedInstanceState){
  super.onCreate(savedInstanceState);
  bind=DataBindingUtil.setContentView(this,R.layout.activity_post_detail);
  db=FirebaseDatabase.getInstance();
  auth=FirebaseAuth.getInstance();
  Intent i=getIntent();
  if (i != null) {
    bind.nickname.setText(i.getStringExtra(EXTRA_NAME));
    bind.date.setText(i.getStringExtra(EXTRA_DATE));
    bind.content.setText(i.getStringExtra(EXTRA_CONTENT));
    ownerId=i.getStringExtra(EXTRA_OWNER_ID);
    postId=i.getStringExtra(EXTRA_ID);
    bind.like.setText(getResources().getString(R.string.like_cnt,i.getLongExtra(EXTRA_LIKE,0)));
    bind.comment.setText(getResources().getString(R.string.comment_cnt,i.getLongExtra(EXTRA_COMMENT,0)));
    bind.view.setText(getResources().getString(R.string.view_cnt,i.getLongExtra(EXTRA_VIEW,0)));
    String photo=i.getStringExtra(EXTRA_OWNER_PHOTO_URL);
    if (photo != null)     Picasso.with(this).load(photo).resize(ImageUtils.SIZE_XL,ImageUtils.SIZE_XL).into(bind.photo);
    db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").addListenerForSingleValueEvent(new ValueEventListener(){
      @Override public void onDataChange(      DataSnapshot dataSnapshot){
        for (        DataSnapshot snap : dataSnapshot.getChildren())         if (auth.getCurrentUser().getUid().equals((String)snap.getValue()))         return;
        db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").push().setValue(auth.getCurrentUser().getUid());
        db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").addListenerForSingleValueEvent(new ValueEventListener(){
          @Override public void onDataChange(          DataSnapshot dataSnapshot){
            final long x=(long)dataSnapshot.getValue() + 1;
            db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").setValue(x).addOnCompleteListener(new OnCompleteListener<Void>(){
              @Override public void onComplete(              @NonNull Task<Void> task){
                bind.view.setText(getResources().getString(R.string.view_cnt,x));
                updateResult();
              }
            }
);
          }
          @Override public void onCancelled(          DatabaseError databaseError){
          }
        }
);
      }
      @Override public void onCancelled(      DatabaseError databaseError){
      }
    }
);
  }
  bind.nickname.setOnClickListener(onClickShowUser);
  bind.photo.setOnClickListener(onClickShowUser);
  dialogComments=CommentsDialog.getDialog(postId);
  dialogComments.setCallback(new CommentsDialog.OnCloseListener(){
    @Override public void onClose(){
      updateResult();
    }
  }
);
  dialogLikes=LikesDialog.getDialogInstance(postId);
  bind.like.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").addListenerForSingleValueEvent(new ValueEventListener(){
        @Override public void onDataChange(        DataSnapshot dataSnapshot){
          for (          DataSnapshot snap : dataSnapshot.getChildren())           if (auth.getCurrentUser().getUid().equals((String)snap.getValue()))           return;
          db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").push().setValue(auth.getCurrentUser().getUid());
          db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").addListenerForSingleValueEvent(new ValueEventListener(){
            @Override public void onDataChange(            DataSnapshot dataSnapshot){
              final long x=(long)dataSnapshot.getValue() + 1;
              db.getReference().child("String_Node_Str").child(postId).child("String_Node_Str").setValue(x).addOnCompleteListener(new OnCompleteListener<Void>(){
                @Override public void onComplete(                @NonNull Task<Void> task){
                  bind.like.setText(getResources().getString(R.string.like_cnt,x));
                  updateResult();
                }
              }
);
            }
            @Override public void onCancelled(            DatabaseError databaseError){
            }
          }
);
        }
        @Override public void onCancelled(        DatabaseError databaseError){
        }
      }
);
    }
  }
);
  bind.showComments.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      dialogComments.show(getSupportFragmentManager(),"String_Node_Str");
    }
  }
);
  bind.showLikes.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      dialogLikes.show(getSupportFragmentManager(),"String_Node_Str");
    }
  }
);
}