Can I add a menu item to the context menu of every Java source file?

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Yes. In NetBeans 5.0 and later there is a wizard available for NetBeans modules which does this for you. Just run New File | Module Development | Action, as an action type choose Conditionally Enabled. Choose "Data Object" in Cookie Class(es) combobox. On the next step select "File Type Context Menu Item" and choose text/x-java in the File Type Context Menu Item combobox, finish the wizard and you are done. For more information you may press the Help button available at the bottom of each step of the wizard.