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Known Bugs and Limitations

• Jasper cannot be used from within applets, since Jasper relies on calling methods declared as native. This is due to a security-restriction enforced on applets by Java; they are not allowed to call native code.
• Only native threads are supported (as opposed to green threads). This is the default under Windows. Under UNIX, most JDKs use native threads per default in version 1.2.

  On some platforms, you need to explicitly specify the -native option when calling java. The following error is an example of what may happen if you do not specify -native:
  

  % java -classpath .:[...]/lib/sicstus-3.12.1/bin/jasper.jar \
       -Djava.library.path=[...]/lib \
       -Dsicstus.path=[...]./lib/sicstus-3.12.1 Simple
  
  *** panic: libthread loaded into green threads
  Abort (core dumped)
  

  Instead, do
  

  % java -native [...]
  

  this should not be needed with JDK 1.3 or newer.

  See your JDK documentation for more info on command-line parameters to the JVM.

• Some uses of SPTerm will leak memory on the Prolog side. This is not really a bug but may come as a surprise to the unwary. See SPTerm and Memory.
• On some combinations of C-compilers and JDKs (specifically GCC with Sun's JDK), the following warning may occur:
  

  % splfr simple.pl
  SICStus 3.8.7 (sparc-solaris-5.7): Mon Feb 21 10:43:17 MET 2000
  Licensed to SICS
  {spk.ai82.c generated, 20 msec}
  
  In file included from /usr/local/jdk1.2/include/jni.h:35,
                   from spk.ai82.c:94:
  /usr/local/jdk1.2/include/solaris/jni_md.h:20: warning: \
     ignoring pragma: "@(#)jni_md.h      1.11    99/02/01 SMI
  

  The warning can be safely ignored. You can suppress the warnings when using gcc by passing the options --cflag=-Wno-unknown-pragmas to splfr.

• Loading multiple SICStus runtimes has not been very well tested with multi threaded Jasper.