Attempt to invoke virtual method 'void com.example.app.createLoginSession(java.lang.String)' on a null object reference
49
What is a NullPointerException, and how do I fix it?
66284
NullPointerException when Creating an Array of objects
112328
Error: "an object reference is required for the non-static field, method or property..."
33103
How come invoking a (static) method on a null reference doesn't throw NullPointerException?
85201
"Cannot create an instance of the abstract class or interface" C# error message
135931
What does "Method '~' of object '~' failed" at runtime mean?
79477
Why is "null" present in C# and Java?
70532
NullReferenceException after POST
8283
Why does null reference print as "null"
46857
Compiler warning: null reference exception
64200
Can Java's NullPointerException be changed to report on which variable was null?
140738
Does setting Java objects to null do anything anymore?
46944
Null pointer Exception - findViewById()
23702
Login Loop - "BadValue (integer parameter out of range for operation)" - 16.04
12759
Unable to aquire valid session id using an apex class
149666
Why can't a null-reference exception name the object that has a null reference?
13711
java.lang.NullPointerException at org.glassfish.hk2.classmodel.reflect.impl.TypesImpl.getType