query: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
positive_passages.docid: 49
positive_passages.text: What is a NullPointerException, and how do I fix it?
negative_passages.docid: 131886
negative_passages.text: Why doesn't this method work? Java ternary operator
negative_passages.docid: 17784
negative_passages.text: Java if ternary operator and Collections.emptyList()
negative_passages.docid: 38241
negative_passages.text: How do I check for nulls in an '==' operator overload without infinite recursion?
negative_passages.docid: 152371
negative_passages.text: equals vs Arrays.equals in Java
negative_passages.docid: 89714
negative_passages.text: What is the difference between Nullable.HasValue or Nullable != null?
negative_passages.docid: 152780
negative_passages.text: what is the difference between null != object and object!=null
negative_passages.docid: 108336
negative_passages.text: Nullable Object must have a value #2
negative_passages.docid: 141442
negative_passages.text: Why does my string comparison fail?
negative_passages.docid: 3941
negative_passages.text: What's the difference between ".equals" and "=="?
negative_passages.docid: 110074
negative_passages.text: What is the difference between == and equals() in Java?
negative_passages.docid: 2146
negative_passages.text: object==null or null==object?
negative_passages.docid: 10581
negative_passages.text: Avoiding NullPointerException in Java
negative_passages.docid: 47233
negative_passages.text: Cannot perform instanceof check against parameterized type ArrayList
negative_passages.docid: 29684
negative_passages.text: How to check if an object is nullable?
negative_passages.docid: 38780
negative_passages.text: Checking for null before ToString()
negative_passages.docid: 78156
negative_passages.text: String.equals() with multiple conditions (and one action on result)