我从位于
的样本运行STS客户端https://docs.wso2.com/display/IS540/Downloading+a+Sample
我使用'sts-policy-ut.xml'作为我的政策（请参阅代码）。我得到了SAML2令牌，我也可以验证。当我在'client.properties'文件中启用relyingPary标志时，我收到以下错误：
java.lang.ClassCastException: org.apache.axiom.om.impl.llom.OMElementImpl cannot be cast to org.w3c.dom.Element
at org.apache.rampart.builder.BindingBuilder.handleSupportingTokens(BindingBuilder.java:392)
at org.apache.rampart.builder.SymmetricBindingBuilder.doSignBeforeEncrypt(SymmetricBindingBuilder.java:499)
at org.apache.rampart.builder.SymmetricBindingBuilder.build(SymmetricBindingBuilder.java:86)
at org.apache.rampart.MessageBuilder.build(MessageBuilder.java:144)
at org.apache.rampart.handler.RampartSender.invoke(RampartSender.java:65)
at org.apache.axis2.engine.Phase.invokeHandler(Phase.java:340)
at org.apache.axis2.engine.Phase.invoke(Phase.java:313)
at org.apache.axis2.engine.AxisEngine.invoke(AxisEngine.java:262)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:427)
at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:406)
at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:555)
at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:531)
at org.wso2.carbon.identity.samples.sts.Client.run(Client.java:239)
at org.wso2.carbon.identity.samples.sts.Client.main(Client.java:95)
请告诉我如何修复它。我只是使用推荐的Maven方法来构建项目并运行提供的批处理文件。