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1. Open schema in read-only mode (for example, open a schema from JAR). 2. In Source View, perform an editing operation (for example, press Del). Result: message in status bar reads: "File ... cannot be locked because it is read-only". It's not clear what is the "lock" here. Message should be "File ... is read-only" or "File ... cannot be edited because it is read-only".
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss