Things To Remember - NullPointerException on if with null boolean value

Update 12/2017: Could just smile at this now.

This one occurred to me today and it's caused by laziness I got used to while coding in untyped languages :) The condition in if statement should evaluate to boolean. If it's null, then NullPointerException is thrown as in the following test case.

@Test(expected = NullPointerException.class)
public void shouldThrowNullPointerException() throws Exception {
    Boolean someFlag = null;
    if (someFlag) {
        // unexpected
    } else {
        // could be expected
    }
}