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Compile on save on maven platform projects doesn't work until you manually build the project once. This was discused in netbeans dev mailing list. That's Milos comment: "if you set the Compile on Save to work on main sources, it did so at the time I wrote the blog entry. now that I've tried, there seems to be a bug that once you set it, you need to build project once from the UI to get the target/classes/.netbeans_automatic_build file to appear. That file is what the java support checks and compiles on save then"
Reassigning to default owner.
*** This bug has been marked as a duplicate of bug 189103 ***