2、如果使用axis2自动生成Client端的代理类TermInfoStub和JUnit Test类TermInfoTest,调用web service服务时，（详细代码见3），
debug跟踪,执行到_operationClient.execute(true);时出现上面的空指针异常,
如果debug跟进去的话，会执行调用，连接数据库调用到getStatement()时，报错:
[INFO] Unable to sendViaPost to url[http://localhost:8080/axis2/services/TermInfo]
java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at org.apache.commons.httpclient.HttpParser.readRawLine(HttpParser.java:78)
at org.apache.commons.httpclient.HttpParser.readLine(HttpParser.java:106)
at org.apache.commons.httpclient.HttpConnection.readLine(HttpConnection.java:1116)
at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.readLine(MultiThreadedHttpConnectionManager.java:1413)
at org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1973)
at org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1735)
at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1098)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:346)
at org.apache.axis2.transport.http.AbstractHTTPSender.executeMethod(AbstractHTTPSender.java:542)
at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:189)
at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:75)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:364)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:208)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:448)
at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:401)
at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:228)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:163)
at dataaccess.TermInfoStub.ifTheTermIsExistByLabelCh(TermInfoStub.java:5900)
at dataaccess.TermInfoTest.testifTheTermIsExistByLabelCh(TermInfoTest.java:791)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at junit.framework.TestCase.runTest(TestCase.java:164)
at junit.framework.TestCase.runBare(TestCase.java:130)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:120)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

3./**
  * Auto generated method signature
  *
  * @see dataaccess.TermInfo#ifTheTermIsExistById
  * @param ifTheTermIsExistById23
  *
  * @throws dataaccess.ExceptionException0 :
  */

 public dataaccess.TermInfoStub.IfTheTermIsExistByIdResponse ifTheTermIsExistById(

 dataaccess.TermInfoStub.IfTheTermIsExistById ifTheTermIsExistById23)

 throws java.rmi.RemoteException

 , dataaccess.ExceptionException0 {
  org.apache.axis2.context.MessageContext _messageContext = null;
  try {
   org.apache.axis2.client.OperationClient _operationClient = _serviceClient
     .createClient(_operations[12].getName());
   _operationClient.getOptions().setAction("urn:ifTheTermIsExistById");
   _operationClient.getOptions().setExceptionToBeThrownOnSOAPFault(
     true);

   addPropertyToOperationClient(
     _operationClient,
     org.apache.axis2.description.WSDL2Constants.ATTR_WHTTP_QUERY_PARAMETER_SEPARATOR,
     "&");

   // create a message context
   _messageContext = new org.apache.axis2.context.MessageContext();

   // create SOAP envelope with that payload
   org.apache.axiom.soap.SOAPEnvelope env = null;

   env = toEnvelope(getFactory(_operationClient.getOptions()
     .getSoapVersionURI()), ifTheTermIsExistById23,
     optimizeContent(new javax.xml.namespace.QName(
       "http://dataAccess", "ifTheTermIsExistById")));

   // adding SOAP soap_headers
   _serviceClient.addHeadersToEnvelope(env);
   // set the message context with that soap envelope
   _messageContext.setEnvelope(env);

   // add the message contxt to the operation client
   _operationClient.addMessageContext(_messageContext);
   
   _serviceClient.getOptions().setProperty(HTTPConstants.SO_TIMEOUT,new Integer(600000));
   _serviceClient.getOptions().setProperty(HTTPConstants.CONNECTION_TIMEOUT,new Integer(600000));

      
   // execute the operation client
   [color=#FF0000] _operationClient.execute(true);
/*执行到此处时停止，捕捉到异常，如果跟进去的话，会执行连接数据库操作，但出现问题：[INFO] Unable to sendViaPost to url[http://localhost:8080/axis2/services/TermInfo]
java.net.SocketTimeoutException: Read timed out */[/color]

   org.apache.axis2.context.MessageContext _returnMessageContext = _operationClient
     .getMessageContext(org.apache.axis2.wsdl.WSDLConstants.MESSAGE_LABEL_IN_VALUE);
   org.apache.axiom.soap.SOAPEnvelope _returnEnv = _returnMessageContext
     .getEnvelope();

   java.lang.Object object = fromOM(_returnEnv.getBody()
     .getFirstElement(),
     dataaccess.TermInfoStub.IfTheTermIsExistByIdResponse.class,
     getEnvelopeNamespaces(_returnEnv));

   return (dataaccess.TermInfoStub.IfTheTermIsExistByIdResponse) object;

  } catch (org.apache.axis2.AxisFault f) {

   org.apache.axiom.om.OMElement faultElt = f.getDetail();
   if (faultElt != null) {
    if (faultExceptionNameMap.containsKey(faultElt.getQName())) {
     // make the fault by reflection
     try {
      java.lang.String exceptionClassName = (java.lang.String) faultExceptionClassNameMap
        .get(faultElt.getQName());
      java.lang.Class exceptionClass = java.lang.Class
        .forName(exceptionClassName);
      java.lang.Exception ex = (java.lang.Exception) exceptionClass
        .newInstance();
      // message class
      java.lang.String messageClassName = (java.lang.String) faultMessageMap
        .get(faultElt.getQName());
      java.lang.Class messageClass = java.lang.Class
        .forName(messageClassName);
      java.lang.Object messageObject = fromOM(faultElt,
        messageClass, null);
      java.lang.reflect.Method m = exceptionClass.getMethod(
        "setFaultMessage",
        new java.lang.Class[] { messageClass });
      m.invoke(ex, new java.lang.Object[] { messageObject });

      if (ex instanceof dataaccess.ExceptionException0) {
       throw (dataaccess.ExceptionException0) ex;
      }

      throw new java.rmi.RemoteException(ex.getMessage(), ex);
     } catch (java.lang.ClassCastException e) {
      // we cannot intantiate the class - throw the original
      // Axis fault
      throw f;
     } catch (java.lang.ClassNotFoundException e) {
      // we cannot intantiate the class - throw the original
      // Axis fault
      throw f;
     } catch (java.lang.NoSuchMethodException e) {
      // we cannot intantiate the class - throw the original
      // Axis fault
      throw f;
     } catch (java.lang.reflect.InvocationTargetException e) {
      // we cannot intantiate the class - throw the original
      // Axis fault
      throw f;
     } catch (java.lang.IllegalAccessException e) {
      // we cannot intantiate the class - throw the original
      // Axis fault
      throw f;
     } catch (java.lang.InstantiationException e) {
      // we cannot intantiate the class - throw the original
      // Axis fault
      throw f;
     }
    } else {
     throw f;
    }
   } else {
    throw f;
   }
  } finally {
   _messageContext.getTransportOut().getSender().cleanup(
     _messageContext);
  }
 }