IllegalStateException: Cannot obtain inMethodFlag for: getPrimaryKey

Can anyone tell me why following exception comes?

java开发者_开发百科.rmi.ServerException: RuntimeException; nested exception is:
    java.lang.IllegalStateException: Cannot obtain inMethodFlag for: getPrimaryKey

How to avoid it?

According to the AllowedOperationsFlags API it will be thrown when the getPrimaryKey() has been called at a wrong time, e.g. during ejbCreate(). It's hard to suggest a solution without more context about your particular problem and/or a SSCCE.