"Nicholas R. Rinard" <email@hidden> wrote:
>if( model == null ) {
>
>and, shockingly, this line of code is throwing a null pointer
>exception. this line of code is called from within my app startup
>routine but is called after model is initialized.
A NullPointerException in that expression should be impossible. The
bytecodes that should be compiled for that statement are specifically
designed to work with null and not throw NPE.
Please provide an example that consistently throws the exception. Also,
which Java version and OS version is this happening on?
One possible explanation is that the line-number stated in the exception is
only approximate, and the real culprit is on a nearby line, either before
or after the line-number in the exception.
Another possibility is that the source wasn't recompiled, so the
line-number in the class-file is exact but you're looking at source that
doesn't match the executed bytecodes.
Those are just guesses, though.
If you're absolutely certain it's not a mistake like the above, you can use
the 'javap -c' command to disassemble the class's bytecodes (read 'man
javap' for info). You should see an 'ifnonnull' bytecode where your source
has 'if (model==null)'. An ifnonnull branches when its operand is
non-null, therefore it would execute the following code, the body of your
'if', when its operand (model) is null.
-- GG
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