FWIW, Java should be installed manually. It can be installed via CPAN, but make test should not be run until after the install. You could do:

perl Makefile.PL
make
make install
[download]

That will install the 'Frontend".

perl java_server_install.pl
[download]

From the cpan shell:

cpan> test Java
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That will get the 'Backend' up and going. See the README for more info.