I am working right now on trying to upgrade websend to 1.13.x but I am running into issues with the compiler. If you want to help, please take a look at the Java source: https://github.com/uncovery/Websend and let me know if you are able to make it run.
The current issue I am facing seems more generically related to Java, but I am not knowledgeable enough to solve this:
what does the compiler say if you type “public abstract class…”?
I am working with netbeans, not sure how I would do that…