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Synchronization and Override methods funcionality should be rewritten to use the new JMI API instead of the old org.openide.src. This will make it possible to make these features work with anonymous classes, JDK 1.5 features and also should improve the performance.
The actions have been rewritten, the issues this task depends on are fixed. There are still problems with automatic invocation of synchronization on methods changes in super types, see issue 48311.