java.lang.Integer.compareTo(null) should throw NPE. It should be described in the javadoc spec.

In fact Integer.compareTo(null) throws null. To reproduce it you may run following test:

public class Test {
    public static void main(String[] args) {
        new Integer(3).compareTo(null);
    }
}

----
the result is:
Exception in thread "main" java.lang.NullPointerException
...


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