wssecurity 实现数字签名报错，高手请指点一下。

Question

客户端调用的代码如下：
public static void main(String[] args) {
// TODO Auto-generated method stub
  try
    {
         
     String serviceURL = "http://localhost:8080/WebStudy/services/TestHelloService";
     Service srvcModel = new ObjectServiceFactory().create(ITestHelloService.class);
     XFireProxyFactory factory = new XFireProxyFactory(XFireFactory.newInstance().getXFire());
     ITestHelloService service = (ITestHelloService)factory.create(srvcModel,serviceURL);
    
     Client client = Client.getInstance(service);
     client.addOutHandler(new DOMOutHandler());
     Properties properties = new Properties();
     //设置认证类型为数字证书方式
     properties.setProperty(WSHandlerConstants.ACTION, WSHandlerConstants.SIGNATURE);
    
     //添加用户名：
     properties.setProperty(WSHandlerConstants.PASSWORD_TYPE, WSConstants.PW_TEXT);
     properties.setProperty(WSHandlerConstants.USER,"admin");
     properties.setProperty(WSHandlerConstants.PW_CALLBACK_CLASS, PasswordHandler.class.getName());
     properties.setProperty(WSHandlerConstants.SIG_PROP_FILE, "META-INF/xfire/outsecurity.properties");
     properties.setProperty(WSHandlerConstants.SIG_KEY_ID, "IssuerSerial");
     client.addOutHandler(new WSS4JOutHandler(properties));
     System.out.println(service.sayHello("Web Service"));
    }
    catch(Exception ex)
    {
     System.out.println(ex);
    }
}服务器配置service.xml文件如下：
<service>
      <name>TestHelloService</name>
      <namespace>http://com.webservice/TestHelloService</namespace>
        <serviceClass>com.webservice.ITestHelloService</serviceClass>
        <implementationClass>com.webservice.TestHelloServiceImpl
        </implementationClass>
        <inHandlers>
          <handler  handlerClass = "org.codehaus.xfire.util.dom.DOMInHandler" />
          <bean id="org.codehaus.xfire.security.wss4j.WSS4JInHandler" 
                class="org.codehaus.xfire.security.wss4j.WSS4JInHandler" xmlns="">
           <property name="properties">
             <props>
             <prop key="action">Signature</prop>
             <prop key="signaturePropFile">META-INF/xfire/insecurity.properties</prop>
             <prop key="passwordCallbackClass">com.webservice.wssecurity.PasswordHandler</prop>
             </props>
           </property>
          </bean>
          <handler handlerClass ="com.webservice.wssecurity.ValidateUserTokenHandler"/>
          </inHandlers>
</service>数字证书都放到了服务器的\src\META-INF\xfire\下面了生成数字证书的命令如下：
客户端调用的时候报错如下：
org.codehaus.xfire.XFireRuntimeException: Could not invoke service.. Nested exception is org.codehaus.xfire.fault.XFireFault: WSHandler: Signature: error during message procesingorg.apache.ws.security.WSSecurityException: Signature creation failed; nested exception is: 
java.security.UnrecoverableKeyException: Cannot recover key