query: NullPointerException in TreeSet when removeAll()
positive_passages.docid: 49
positive_passages.text: What is a NullPointerException, and how do I fix it?
negative_passages.docid: 19198
negative_passages.text: Does assigning objects to null in Java impact garbage collection?
negative_passages.docid: 70532
negative_passages.text: NullReferenceException after POST
negative_passages.docid: 149666
negative_passages.text: Why can't a null-reference exception name the object that has a null reference?
negative_passages.docid: 40818
negative_passages.text: What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
negative_passages.docid: 130819
negative_passages.text: Nullpointerexception while setting a bean
negative_passages.docid: 35016
negative_passages.text: java.lang.NullPointerException at org.primefaces.component.datatable.feature.FilterFeature.filter
negative_passages.docid: 171
negative_passages.text: Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a loop
negative_passages.docid: 132398
negative_passages.text: What is null in Java?
negative_passages.docid: 64200
negative_passages.text: Can Java's NullPointerException be changed to report on which variable was null?
negative_passages.docid: 38780
negative_passages.text: Checking for null before ToString()
negative_passages.docid: 153563
negative_passages.text: putExtra treeMap returns HashMap cannot be cast to TreeMap android
negative_passages.docid: 23964
negative_passages.text: Why does Java have a "NullPointerException" when there are no pointers in Java?
negative_passages.docid: 37988
negative_passages.text: System.NullPointerException: Attempt to de-reference a null object:
negative_passages.docid: 87189
negative_passages.text: System.NullPointerException
negative_passages.docid: 78238
negative_passages.text: Nullable type is not a nullable type?
negative_passages.docid: 73034
negative_passages.text: StringBuilder append() and null values