query: ArrayList#isEmpty() method throws NullPointerException
positive_passages.docid: 49
positive_passages.text: What is a NullPointerException, and how do I fix it?
negative_passages.docid: 88920
negative_passages.text: Is using NULL references OK?
negative_passages.docid: 65944
negative_passages.text: Easier way of writing null or empty?
negative_passages.docid: 79162
negative_passages.text: Javascript null or empty string does not work
negative_passages.docid: 104935
negative_passages.text: Java ArrayList add() method in the instance variable section
negative_passages.docid: 129023
negative_passages.text: Null check in an enhanced for loop
negative_passages.docid: 55830
negative_passages.text: What's the rationale for null terminated strings?
negative_passages.docid: 114378
negative_passages.text: How to check if the string is empty?
negative_passages.docid: 119573
negative_passages.text: NullPointerException in Java with no StackTrace
negative_passages.docid: 58054
negative_passages.text: When is it OK to catch NullPointerException?
negative_passages.docid: 73285
negative_passages.text: Null Pointer Exception in XMl Parsing
negative_passages.docid: 52076
negative_passages.text: Why is an ArrayList parameter modified, but not a String parameter?
negative_passages.docid: 42958
negative_passages.text: Method Overloading for null argument
negative_passages.docid: 87728
negative_passages.text: ArgumentNullException or NullReferenceException from extension method?
negative_passages.docid: 29684
negative_passages.text: How to check if an object is nullable?
negative_passages.docid: 20020
negative_passages.text: NullPointerException accessing views in onCreate()
negative_passages.docid: 85180
negative_passages.text: Most efficient way to see if an ArrayList contains an object in Java