java调用PHP接口时，遇到问题

org.codehaus.xfire.XFireRuntimeException: Could not invoke service.. Nested exception is org.codehaus.xfire.fault.XFireF

ault: Unexpected character 'S' (code 83) in epilog; expected '<'

 at [row,col {unknown-source}]: [1,24]

org.codehaus.xfire.fault.XFireFault: Unexpected character 'S' (code 83) in epilog; expected '<'

 at [row,col {unknown-source}]: [1,24]

        at org.codehaus.xfire.fault.XFireFault.createFault(XFireFault.java:89)

        at org.codehaus.xfire.client.Client.onReceive(Client.java:410)

        at org.codehaus.xfire.transport.http.HttpChannel.sendViaClient(HttpChannel.java:139)

        at org.codehaus.xfire.transport.http.XFireServletChannel.send(XFireServletChannel.java:48)

        at org.codehaus.xfire.handler.OutMessageSender.invoke(OutMessageSender.java:26)

        at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)

        at org.codehaus.xfire.client.Invocation.invoke(Invocation.java:79)

        at org.codehaus.xfire.client.Invocation.invoke(Invocation.java:114)

        at org.codehaus.xfire.client.Client.invoke(Client.java:336)

        at org.codehaus.xfire.client.XFireProxy.handleRequest(XFireProxy.java:77)

        at org.codehaus.xfire.client.XFireProxy.invoke(XFireProxy.java:57)

        at $Proxy7.isUser(Unknown Source)

        at com.yingnet.t.common.bo.MembersBO.isRepeat4username(MembersBO.java:38)

        at com.yingnet.gzycw.common.struts.BindAction.check_username(BindAction.java:81)

        at sun.reflect.GeneratedMethodAccessor678.invoke(Unknown Source)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.lang.reflect.Method.invoke(Method.java:601)

        at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)

        at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:216)

        at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)

        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)

        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)

        at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

        at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:130)

        at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:107)

        at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:78)

        at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:383)

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

        at com.yingnet.framework.filter.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:40)

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)

        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)

        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)

        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)

        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)

        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)

        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)

        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)

        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)

        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)

        at java.lang.Thread.run(Thread.java:722)

Caused by: com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected character 'S' (code 83) in epilog; expected '<'

 at [row,col {unknown-source}]: [1,24]

        at com.ctc.wstx.sr.StreamScanner.throwUnexpectedChar(StreamScanner.java:623)

        at com.ctc.wstx.sr.BasicStreamReader.nextFromProlog(BasicStreamReader.java:2047)

        at com.ctc.wstx.sr.BasicStreamReader.nextFromTree(BasicStreamReader.java:2647)

        at com.ctc.wstx.sr.BasicStreamReader.next(BasicStreamReader.java:1019)

        at org.codehaus.xfire.soap.handler.ReadHeadersHandler.invoke(ReadHeadersHandler.java:44)

        at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)

        at org.codehaus.xfire.client.Client.onReceive(Client.java:406)

        ... 47 more

此接口是调用PHP的createuser()方法向数据库插入数据，导致此问题的原因是由于数据库中已存在当前插入的数据。