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We can't generate javadoc with a java platform 1.3. Generated build-impl.xml as a "-source" flag which is not supported in JDK 1.3. Here is a workaround given by Dmitry (NetBeans Installer Team) : "What can I also suggest? In fact, you can select JDK6 as the Java Platform for you project but set Source/Binary Format to 1.3 ("Sources" category in Project Properties)." It works.
reassigning to java/j2seproject
JDK 1.3 is not supported.