Attempt to invoke interface method 'boolean java.util.List.add(java.lang.Object)' on a null object reference
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What is a NullPointerException, and how do I fix it?
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Android: Issue during Arraylist declaration
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System.QueryException: List has no rows for assignment to SObject
85865
Optional Methods in Java Interface
80941
Java - Updating JList after changing an object
130819
Nullpointerexception while setting a bean
64332
avoiding null reference exceptions
66856
Method does not exist or incorrect signature?
126943
Instantiate objects in a List and use it
69771
NullPointerException when setting attribute?
32065
Attempt to de-reference a null object: Trigger
105364
Appending an item to a python list in the declaration statement list = [].append(val) is a NoneType
59951
Why does list.append evaluate to false in a boolean context?
144658
System.NullPointerException: Attempt to de-reference a null object ,sravn
113199
@OneToOne(optional=false) and @JoinColumn(nullable=false) used together
89714
What is the difference between Nullable.HasValue or Nullable != null?
137993
Scripting:How to correctly add a boolean modifer to an object?