Null pointer exception on .iterator() call

Posted by Peter on Stack Overflow See other posts from Stack Overflow or by Peter
Published on 2010-03-14T22:27:25Z Indexed on 2010/03/14 22:35 UTC
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I'm getting a strange NullPointerException, evidently thrown by the following line of code:

Iterator<Note> it = notes.iterator();

I've checked, and at the time the java.util.TreeSet notes is always non-null (with 15 elements). The TreeSet API says nothing about iterator() throwing NullPointerExceptions. What else could be going here?

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Null pointer exception on .iterator() call - Developer IT

Null pointer exception on .iterator() call

java

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