Re: NullPointer + Jars

["Gregory R. Warnes" <warnes at biostat dot washington dot edu>]

On Fri, 19 May 2000, Bryce McKinlay wrote:

  BM>> "Gregory R. Warnes" wrote:
  BM>> 
  BM>> > The example program "HelloDate.java" is attached, as is the getopt jar
  BM>> > file.
  BM>> >
  BM>> > 1) My code uses the gnu getopt code for java.  When the jar file is in the
  BM>> > classpath, the program throws a NullPointerException on startup (see
  BM>> > below).  When the un-jar-ed data is on the classpath, everything runs
  BM>> > correctly.
  BM>> 
  BM>> As you've probably guessed, the interpreter is much less well tested than the rest
  BM>> of (lib)gcj. The reason your finding bugs here is possibly because nobody has tried
  BM>> to do this before (that is, put a .jar file on the classpath and run something from
  BM>> it ;-)

Actually, I didn't want to touch the interpreter, so I the getopt code is 
compiled in.  

  BM>> I haven't tried your test case, but I think I found the problem. Can you try the
  BM>> patch below?

Will try..

  BM>> 
  BM>> > libgcj configuration:
  BM>> >
  BM>> > ../libgcj/configure --prefix=/usr --disable-threads --norecursion
  BM>> 
  BM>> Any particular reason to build without threads? Was there a problem there? Just
  BM>> curious...

Yes actually.  I have a cluster of machines running MOSIX.  MOSIX will
dynamically migrate processes around the cluster in order to get the
maximum performance.  Unfortunately, MOSIX doesn't support (kernel)
threaded processes.


-Greg