This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
http://wiki.netbeans.org/DevFaqGeneralWhereIsJavadoc says "go to the update center (Tools > Plugin Manager) in the NetBeans IDE and request the NetBeans API Documentation module, which bundles Javadoc matching your IDE release." There should be an equally easy way to get the IDE sources, so I can navigate to a superclass implementation, for example.
reassigning to plugin manager for evaluation
Plugin Manager exposes API to install NetBeans API Documentation on demand. Need to support in Java editor.