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The Javadoc target in the Ant build file generated by the IDE does not support all parameters af the Javadoc Ant task via properties. Especially the "link" parameter is missing to enable links to existing Javadoc such as the Java SE Javadoc. But maybe it would be good to support all parameter via properties, with reasonable defaults. Workaround: Override the target. A related issue about the "overview" parameter: http://www.netbeans.org/issues/show_bug.cgi?id=50039