After building main zxid distribution, say
make javazxid
You must have set JNI_INC variable correctly in the Makefile (or in localconf.mk) and javac must be in path (or you must set JAVAC variable). For the servlet or Tomcat support, you must make sure SERVLET_PATH points to your servlet-api.jar file. The ZXID Java interface has been mainly tested with j2sdk1.4.2 and some versions of Java SDK 1.5.
If you have done changes that require regeneration of the zxidjava/zxid_wrap.c file you should build with
make javazxid ENA_GEN=1
but this requires that you have swig(1) installed. Depending on the changes it may also require xsd2sg.pl and gperf(1), see "Compilation for Experts" section, above, for full explanation. As of January 2007, all of the Java JNI interface is swig(1) generated - there are no human authored files. However, we anticipate building a helper Java library to facilitate use of the JNI - contributions welcome.
After compilation, just copy the class files and the libzxidjni.so to suitable locations in your system (Makefile lacks any specific Java installation target because the author has not yet made up his mind about what makes sense). When you run Java programs that use the zxidjni class, you must makes sure the libzxidjni.so is found by the dynamic linker - usually this means setting LD_LIBRARY_PATH environment variable. The zxid-java.sh shell script demonstrates how to do this for the example CGI program zxid.java.