Attempt to invoke virtual method 'java.lang.Object java.util.HashMap.put(java.lang.Object, java.lang.Object)' on a null object reference
49
What is a NullPointerException, and how do I fix it?
45196
Calling class method through NULL class pointer
21340
Adding  causes java.lang.IllegalStateException: Cannot create a session after the response has been committed
8283
Why does null reference print as "null"
55274
Java: Exception itself is null
101146
Why can't I write Nullable>?
88920
Is using NULL references OK?
147603
How can I call a method in an object from outside the JVM?
38263
How can I combine two HashMap objects containing the same types?
144658
System.NullPointerException: Attempt to de-reference a null object ,sravn
54938
Cannot invoke method or retrieve property from null object. Object returned by the following call stack is null. \"File\r\n\"
65689
getting exception while putting list data into the map
70532
NullReferenceException after POST
58054
When is it OK to catch NullPointerException?
33103
How come invoking a (static) method on a null reference doesn't throw NullPointerException?
130988
Error: JNI ERROR (app bug): accessed stale global reference
132398
What is null in Java?