null pointer Exception when adding an object with multiple classes referring to each other
49
What is a NullPointerException, and how do I fix it?
131864
Member '' cannot be accessed with an instance reference
45196
Calling class method through NULL class pointer
149666
Why can't a null-reference exception name the object that has a null reference?
85964
Android: ClassNotFoundException when passing serializable object to Activity
88920
Is using NULL references OK?
64332
avoiding null reference exceptions
120647
how to pass objects between intents
10867
How to avoid ArrayIndexOutOfBoundsException or IndexOutOfBoundsException?
80018
Accessing class members on a NULL pointer
87189
System.NullPointerException
9073
Cannot make a static reference to the non-static method
146476
Java: Why aren't NullPointerExceptions called NullReferenceExceptions?
21453
IllegalAnnotationsException: Class has two properties of same name
23463
Can a java file have more than one class?
79586
System.NullPointerException: Attempt to de-reference a null object
140738
Does setting Java objects to null do anything anymore?