java调用RFC访问SAP

java调用RFC访问SAP返回错误信息：com.sap.conn.jco.JCoException: (104) RFC_ERROR_SYSTEM_FAILURE: Missing parameter with PERFORM.(Remote shortdump: PERFORM_PARAMETER_MISSING)。

INFO :[ : RfcException: [null]
INFO :[: message: Missing parameter with PERFORM.
INFO :[ : Return code: RFC_SYS_EXCEPTION(3)
INFO :[: error group: 104
INFO :[ : key: RFC_ERROR_SYSTEM_FAILURE
INFO :[: message class: 00
INFO :[ : message type: X
INFO :[ : message number: 341
INFO :[ : message parameter 0: PERFORM_PARAMETER_MISSING
INFO :[ : at com.sap.conn.rfc.engine.RfcIoOpenCntl.RfcReceive(RfcIoOpenCntl.java:1927)
INFO :[ : at com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcClient.execute(MiddlewareJavaRfc.java:1631)
INFO :[ : ... 64 more
INFO :[ : Caused by: com.sap.conn.rfc.exceptions.RfcGetException: Missing parameter with PERFORM.
INFO :[ : at com.sap.conn.rfc.engine.RfcImp.ab_rfcerror(RfcImp.java:1233)
INFO :[ : at com.sap.conn.rfc.engine.RfcGet.rfcget_run(RfcGet.java:128)
INFO :[ : at com.sap.conn.rfc.engine.RfcGet.ab_rfcget(RfcGet.java:23)
INFO :[ : at com.sap.conn.rfc.engine.RfcRcv.ab_rfcreceive(RfcRcv.java:32)
INFO :[ : at com.sap.conn.rfc.engine.RfcIoOpenCntl.RfcReceive(RfcIoOpenCntl.java:1884)
INFO :[ : ... 65 more