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Should be made more consistent with other project types. Check if org.netbeans.modules.java.api.common.project.ui can be reused at all (might be useful for apisupport.project as well).
Specifically - should add ClassPath.BOOT as a JDK node - add actions like Show Javadoc, Go to Source, etc.
Should also permit user to make manual source and/or Javadoc correspondences for classpath entries, though issue #160485 would be a more satisfactory and general solution.