Evidently your version of Java is not supporting JTextAreaWriter. Try a later version.

The reason for using Java is because the NetBeans development environment is far better for building GUIs than anything else I have ever seen since the last time I used C++ Builder. The Java freemarker template engine is extremely capable and fairly easy to use.

Being multilingual is not an issue, it is something to strive for. One should be able to use the best language for the task, and in this case Java was it. Moreover, why would you care what the underlying language is? In the final analysis, it is the actual result that counts.

I wrote a pure Perl version of PerlWizard many years ago for myself and it saved me tremendous amounts of time. But it was difficult to enhance. The Freemarker template engine made it far easier. The OneJar solution made it very easy to package and distribute everything in one file.

So give it a try with a newer version of Java and please let us know how it worked for you. In any case, thanks for trying it at least once.