6.5 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-3.12.8/bin/jasper.jar \
                 -Djava.library.path=[...]/lib \
                 -Dsicstus.path=[...]./lib/sicstus-3.12.8 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.