用eclipse建立的webService客户端，在使用上完成正常，能正确发送请求并取得结果，但我将LOG4J配置成DEBUG后，看到每调用一次者抛出两次错误（如下，载取自出错日志），请问是何原因？
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16:47:01,828 DEBUG [main] org.apache.axis.MessageContext : MessageContext: setTargetService(PortalEngineDX)
16:47:01,828 DEBUG [main] org.apache.axis.i18n.ProjectResourceBundle : org.apache.axis.i18n.resource::handleGetObject(noService10)
16:47:01,828 DEBUG [main] org.apache.axis.ConfigurationException : Exception:
org.apache.axis.ConfigurationException: No service named PortalEngineDX is available
org.apache.axis.ConfigurationException: No service named PortalEngineDX is available
at org.apache.axis.configuration.FileProvider.getService(FileProvider.java:233)
at org.apache.axis.AxisEngine.getService(AxisEngine.java:311)
at org.apache.axis.MessageContext.setTargetService(MessageContext.java:755)
at org.apache.axis.client.Call.invoke(Call.java:2671)
at org.apache.axis.client.Call.invoke(Call.java:2424)
at org.apache.axis.client.Call.invoke(Call.java:2347)
at org.apache.axis.client.Call.invoke(Call.java:1804)
at com.ct.schema.portal.enginedx.PortalEngineDXSoapBindingStub.createUser(PortalEngineDXSoapBindingStub.java:844)
at com.ct.schema.portal.enginedx.PortalEngineDXProxy.createUser(PortalEngineDXProxy.java:81)
at com.k99k.portal.TestSoap1.main(TestSoap1.java:44)
at org.apache.axis.configuration.FileProvider.getService(FileProvider.java:233)
at org.apache.axis.AxisEngine.getService(AxisEngine.java:311)
at org.apache.axis.MessageContext.setTargetService(MessageContext.java:755)
at org.apache.axis.client.Call.invoke(Call.java:2671)
at org.apache.axis.client.Call.invoke(Call.java:2424)
at org.apache.axis.client.Call.invoke(Call.java:2347)
at org.apache.axis.client.Call.invoke(Call.java:1804)
at com.ct.schema.portal.enginedx.PortalEngineDXSoapBindingStub.createUser(PortalEngineDXSoapBindingStub.java:844)
at com.ct.schema.portal.enginedx.PortalEngineDXProxy.createUser(PortalEngineDXProxy.java:81)
at com.k99k.portal.TestSoap1.main(TestSoap1.java:44)
16:47:01,828 DEBUG [main] org.apache.axis.MessageContext : MessageContext: setServiceHandler(null)
16:47:01,828 DEBUG [main] org.apache.axis.i18n.ProjectResourceBundle : org.apache.axis.i18n.resource::handleGetObject(targetService)
16:47:01,828 DEBUG [main] org.apache.axis.client.Call : Target service: PortalEngineDX
16:47:01,828 DEBUG [main] org.apache.axis.MessageContext : MessageContext: setTargetService()
16:47:01,828 DEBUG [main] org.apache.axis.i18n.ProjectResourceBundle : org.apache.axis.i18n.resource::handleGetObject(noService10)
16:47:01,828 DEBUG [main] org.apache.axis.ConfigurationException : Exception:
org.apache.axis.ConfigurationException: No service named is available
org.apache.axis.ConfigurationException: No service named is available
at org.apache.axis.configuration.FileProvider.getService(FileProvider.java:233)
at org.apache.axis.AxisEngine.getService(AxisEngine.java:311)
at org.apache.axis.MessageContext.setTargetService(MessageContext.java:755)
at org.apache.axis.transport.http.HTTPTransport.setupMessageContextImpl(HTTPTransport.java:89)
at org.apache.axis.client.Transport.setupMessageContext(Transport.java:46)
at org.apache.axis.client.Call.invoke(Call.java:2719)
