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In Tools > Options > Editor > Code Completion > Completion Selectors for Java I deleted the default ".,;:([+-=", because it's ultra annoying while typing new identifiers that should NOT get auto completed with something completely unrelated. However, the setting only works for the current session. Upon the next startup of Netbeans, it's reset to the default ".,;:([+-=". Non-empty modifications of the setting are remembered in the next session.