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How can I know where a Null Pointer Exception originated?


How can I know where a Null Pointer Exception originated?

By : user3864839
Date : January 10 2021, 01:49 PM
may help you . You can view the stacktrace if you catch Throwable instead of catching Exception or any subclass of Exception. e.g.
code :


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Runtime Exception and Null Pointer exception while trying to create countdown timer in android

Runtime Exception and Null Pointer exception while trying to create countdown timer in android


By : james
Date : March 29 2020, 07:55 AM
Does that help I'm trying to design a countdown timer for my activity. Whenever I try to run the below code, there is an error coming out. I will show the logcat for more error details. , Move the below inside onCreate after setContentView
code :
 TextView pbid=(TextView)findViewById(R.id.pbid);
 TextView pplaced=(TextView)findViewById(R.id.pplaced);
 TextView timerv=(TextView)findViewById(R.id.timer);
 Intent i=getIntent();
 final String productbiddate=i.getStringExtra("productbiddate");
 final String productplaceddate=i.getStringExtra("productplaceddate");
Exception Dispatching Input Event and Null Pointer Exception on SwipeRefreshLayout Pull down

Exception Dispatching Input Event and Null Pointer Exception on SwipeRefreshLayout Pull down


By : 岳宇星
Date : March 29 2020, 07:55 AM
I wish this helpful for you Your OnRefreshListener is null, either you haven't set one or at some point of your code you are setting it to null.
In the source of SwipeRefreshLayout, particularly in this snippet
code :
 private void startRefresh() {
        removeCallbacks(mCancel);
        mReturnToStartPosition.run();
        setRefreshing(true);
        mListener.onRefresh();
    }
Java Generic Object Null Pointer Check Throwing Null Pointer Exception

Java Generic Object Null Pointer Check Throwing Null Pointer Exception


By : Barnett Lee
Date : March 29 2020, 07:55 AM
Hope this helps In the loop body, current = current.myNext; has no test for myNext being null so on either the first (or a subsequent) loop iteration current must be null. You could change
code :
while (current.myData != null) {
while (current != null && current.myData != null) {
I have an 'if' statement for checking null pointer exception but that line itself is giving a null pointer excpetion

I have an 'if' statement for checking null pointer exception but that line itself is giving a null pointer excpetion


By : Jovial
Date : March 29 2020, 07:55 AM
Hope this helps Code , Here is how you can rewrite it:
code :
if(dataSnapshot != null && dataSnapshot.hasChild("Email") && dataSnapshot.child("Email").getValue() != null ){
    //Your code...
}
Getting a null pointer exception on this line of code. What is a null pointer? And how do i fix

Getting a null pointer exception on this line of code. What is a null pointer? And how do i fix


By : Jon Reader
Date : March 29 2020, 07:55 AM
wish of those help Java allows object references to be null meaning the reference does not refer to a real object.
None of the ways in which you normally use an object reference work with null:
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