question: this implementation always returns null , indicating that no jdbc connection can be provided . concode_field_sep PlaceHolder placeHolder concode_field_sep Object prepareTransaction concode_elem_sep Object beginTransaction concode_elem_sep DataAccessException translateExceptionIfPossible concode_elem_sep void releaseJdbcConnection concode_elem_sep void cleanupTransaction
target: ConnectionHandle function ( EntityManager arg0 , boolean arg1 ) { return null ; }