when i use servlet call EJB designed by container persistenc

[afeilb]

javax.transaction.TransactionRolledbackException: Method setEntityContext() not yet implemented.; nested exception is: java.lang.UnsupportedOperationException: Method setEntityContext() not yet implemented.
Please help me!
thanks
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[afeilb]

i found the error, and correct it,but cmp cannot save the information into database,what can i do??
thanks