TimeoutException is thrown when waiting for a response

I create a bpel process contains a flow activity,when using Apache ODE 1.3.5 with MySql,TimeoutException is thrown .But when using it with derby,it can run sucessfully.
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09:44:55,474 INFO [ExternalService] Response:
<?xml version="1.0" encoding="UTF-8"?>
<message><parameters><AddResponse xmlns="http://www.cattsoft.com/odeCalculatorService" xmlns:ns2="http://www.cattsoft.com/odeCalculatorService" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><return xmlns="">15</return></AddResponse></parameters></message>
09:44:55,475 INFO [ExternalService] Response:
<?xml version="1.0" encoding="UTF-8"?>
<message><parameters><SubResponse xmlns="http://www.cattsoft.com/odeCalculatorService" xmlns:ns2="http://www.cattsoft.com/odeCalculatorService" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><return xmlns="">5</return></SubResponse></parameters></message>
09:46:51,939 ERROR [ODEService] Timeout or execution error when waiting for response to MEX {MyRoleMex#hqejbhcnphr6qid59592u8 [Client hqejbhcnphr6qid59592u7] calling

calculatorFlow.process(...)} java.util.concurrent.TimeoutException: Message exchange org.apache.ode.bpel.engine.MyRoleMessageExchangeImpl$ResponseFuture@1480d96 timed out(120000 ms) when waiting for a response!
java.util.concurrent.TimeoutException: Message exchange org.apache.ode.bpel.engine.MyRoleMessageExchangeImpl$ResponseFuture@1480d96 timed out(120000 ms) when waiting for a response!
at org.apache.ode.bpel.engine.MyRoleMessageExchangeImpl$ResponseFuture.get(MyRoleMessageExchangeImpl.java:245)
at org.apache.ode.axis2.ODEService.onAxisMessageExchange(ODEService.java:161)
at org.apache.ode.axis2.hooks.ODEMessageReceiver.invokeBusinessLogic(ODEMessageReceiver.java:69)
at org.apache.ode.axis2.hooks.ODEMessageReceiver.invokeBusinessLogic(ODEMessageReceiver.java:52)
at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:96)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:145)
at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:275)
at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:120)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)