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When and why does Not implemented (java.lang.reflect.InvocationTargetException) occur?

While opening a JFD file in Eclipse, I am got 'Not implemented (java.lang.reflect.InvocationTargetException)'. Can you tell me when and why does it occur?

It means that a method you are calling throws that exception, and you are not doing anything about it. You either need to put the method call in a try/catch block, or you need to re-throw the exception for someone else to handle.

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