BFS method show nullpointerexception repeatly
49
What is a NullPointerException, and how do I fix it?
33103
How come invoking a (static) method on a null reference doesn't throw NullPointerException?
67597
Can constructor return a null object?
8738
Should a retrieval method return 'null' or throw an exception when it can't produce the return value?
135931
What does "Method '~' of object '~' failed" at runtime mean?
106244
Why do I get java.lang.AbstractMethodError when trying to load a blob in the db?
104501
How do I enforce null checking?
20020
NullPointerException accessing views in onCreate()
29684
How to check if an object is nullable?
81565
getClass().getResource() always returning null
125946
' Exception in Application start method, java.lang.reflect.InvocationTargetException ' while reading and displaying from database
43769
How do I Parameterize a null string with DBNull.Value clearly and quickly
22924
How to debug EntityMalformedException?
98908
Is it good practice to set variables to null when they are no longer needed?
137692
NullPointerException when working with arrays
101003
Running the same JUnit test case multiple time with different data
131693
Android unit tests with multiple threads