This directory contains a sample message extractor written in Java.
Interfacing Java with Perl is considerably more complicated than interfacing a scripting language with Perl. Consequently, the code you find here will probably not win a prize and the implementation has a couple of caveats.
Installing Inline::Java is a little bit different. You have to
invoke sudo cpan install Inline::Java::Class and not just
sudo cpan install Inline::Java.
If the Java compiler cannot be found during the installation, try playing
around with the environment variable JAVA_HOME. The location is
hard-coded into the installed module. Once everything works, the
environment variable is ignored.
You can call all methods of the Perl object from inside Java but any return value but a scalar will probably throw an exception. You can prevent this by implementing wrapper classes like it is done for the keyword definitions. See the Java source file for details.
Only one Java extractor can be instantiated from Perl at a time. This is ugly but does notr really pose a problem.
If you find more problems, contact the author or open an issue.