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I have a Java Application project that depends on several other Java Application projects. In the project properties under Libraries I have the "Build Projects on Classpath" option checked. When I invoke "ant javadoc", I would have expected that this also builds the javadoc for the dependencies, but that is apparently not so. Also Build/Documenting doesn't offer any option to build the javadoc for subprojects.
Unlikely to be implemented; you can always use <subant> or similar to do this if you want it.