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JavaEditor listens to editor events and reparses source from org.netbeans.modules.java.JavaEditor$2.run(JavaEditor.java:230) when there is a delay in typing. After CTRL-S it is parsed again (from org.netbeans.modules.javacore.RepositoryUpdater.updateResource(RepositoryUpdater.java:77)) even if there is no additional change.
Fixed some time ago.
Reorganization of java component