java.lang.NullPointerException: This exception has no message.

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How to put cut and paste in a JMenu with their corresponding  accelerators

This exception has no message.

java.lang.NullPointerException	at Sem2.getActionByName(Sem2.java:300)	at Sem2.createMenuBar(Sem2.java:127)	at Sem2.<init>(Sem2.java:64)	at Sem2.main(Sem2.java:366)