Top "Nullpointerexception" questions

JPA/Hibernate Static Metamodel Attributes not Populated -- NullPointerException

I would like to use JPA2 Criteria API with metamodel objects, which seems to be pretty easy: ... Root<JPAAlbum&…

java hibernate nullpointerexception jpa-2.0 criteria-api

Is Catching a Null Pointer Exception a Code Smell?

Recently a co-worker of mine wrote in some code to catch a null pointer exception around an entire method, and …

java nullpointerexception

listFiles() returns null when it shouldn't. It used to work properly until recently and hasn't been modified

public static void main(String[] args) throws InterruptedException { // TODO Auto-generated method stub while(true) { ArrayList<File> wallpapers = new …

java batch-file jar nullpointerexception access-rights

Proper way to handle Android Studio's NullPointerException lint warning

I'm new to android/java programming and am confused how to properly deal with this warning. Method invocation '' may …

java android nullpointerexception android-studio lint

Booleans, conditional operators and autoboxing

Why does this throw NullPointerException public static void main(String[] args) throws Exception { Boolean b = true ? returnsNull() : false; // NPE on …

java nullpointerexception boolean conditional-operator autoboxing

Why static fields are not initialized in time?

The following code prints null once. class MyClass { private static MyClass myClass = new MyClass(); private static final Object obj = new …

java static null nullpointerexception

Android fragment - findViewById returns null

I have a problem that seems to be quite common on the internet : I have created an activity with just …

android android-fragments nullpointerexception findviewbyid

Guice injection null pointer

We try to refactoring a project with Guice. The idea is to bind all the Language interface to a concreate …

java nullpointerexception guice code-injection

Adding null to empty TreeSet raising NullPointerException

import java.util.TreeSet; class Test { public static void main(String[] args) { TreeSet t=new TreeSet(); t.add(null); System.…

java nullpointerexception treeset

Attempt to invoke virtual method 'android.content.Context android.support.v4.app.FragmentActivity.getApplicationContext()' on a null object reference

Following is my code for my fragment, i get the above error of null exception /** * Created by USer on 09-04…

android android-fragments nullpointerexception baseadapter