tomcat5下启动错误，求解

tomcat5下启动错误，tomcat6正常；求解

严重: WSP0025: com.sun.xml.ws.policy.spi.PolicyAssertionValidator: WSP0028: Service provider com.sun.xml.ws.rm.jaxws.util.RMPolicyValidator could not be instantiated
java.lang.ClassCastException
at java.lang.Class.cast(Unknown Source)
at com.sun.xml.ws.policy.privateutil.ServiceFinder$LazyIterator.next(ServiceFinder.java:378)
at com.sun.xml.ws.policy.privateutil.ServiceFinder.toArray(ServiceFinder.java:228)
at com.sun.xml.ws.policy.privateutil.PolicyUtils$ServiceProvider.load(PolicyUtils.java:445)
at com.sun.xml.ws.policy.AssertionValidationProcessor.<clinit>(AssertionValidationProcessor.java:55)
at com.sun.xml.ws.policy.jaxws.WSDLPolicyMapWrapper.validateServerSidePolicies(WSDLPolicyMapWrapper.java:146)
at com.sun.xml.ws.policy.jaxws.PolicyWSDLParserExtension.postFinished(PolicyWSDLParserExtension.java:1053)
at com.sun.xml.ws.wsdl.parser.DelegatingParserExtension.postFinished(DelegatingParserExtension.java:187)
at com.sun.xml.ws.wsdl.pa --------------------编程问答-------------------- PolicyAssertionValidator类容器不识别 --------------------编程问答-------------------- 这种问题是包冲突呢！还是什么情况导致的呢！ --------------------编程问答-------------------- PolicyAssertionValidator 是jdk1.6.0.0.022以后才会有的，以前是没有这个的

补充：Java ,  Eclipse