I\'m building jars where I want to package them without sources but I would like the javadoc to come up for developers in eclipse.
JIDE have a tool (costs $25) that will run over your source code and strip out all the method bodies, leaving the javadoc in, and produces a zip file. You can then distribute this zip as a source zip, and your IDE will be able to read the javadocs, but of course all your logic has been removed so you can retain your closed-sourceness. Any private members and methods are not included in the zip file.
It also has the added bonus of retaining method parameter names for intellisense, so the following method
public void foo( String text, Integer index ) {
}
will show foo( String text, Integer index ) when you auto-complete, instead of foo( String arg1, Integer arg2 ) so you can hint what the parameters should be.