项目启动异常：Exception: java.lang.RuntimeException: XPathFactory#newInstance()

项目启动时，报如下异常：

**** MessageBrokerServlet failed to initialize due to runtime exception: Exception: java.lang.RuntimeException: XPathFactory#newInstance() failed to create an XPathFactory for the default object model: http://java.sun.com/jaxp/xpath/dom with the XPathFactoryConfigurationException: javax.xml.xpath.XPathFactoryConfigurationException: No XPathFctory implementation found for the object model: http://java.sun.com/jaxp/xpath/domat javax.xml.xpath.XPathFactory.newInstance(Unknown Source)at flex.messaging.config.XPathServerConfigurationParser.initializeExpressionQuery(XPathServerConfigurationParser.java:46)at flex.messaging.config.AbstractConfigurationParser.parse(AbstractConfigurationParser.java:68)at flex.messaging.config.FlexConfigurationManager.getMessagingConfiguration(FlexConfigurationManager.java:79)at flex.messaging.MessageBrokerServlet.init(MessageBrokerServlet.java:106)at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1139)at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:966)at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3956)at org.apache.catalina.core.StandardContext.start(StandardContext.java:4230)at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:926)at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:889)at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1149)at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)at org.apache.catalina.core.StandardService.start(StandardService.java:448)at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)at org.apache.catalina.startup.Catalina.start(Catalina.java:552)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)11/03/29 09:36:57 ERROR [main] [/hgwl].loadOnStartup(3958) | Servlet /hgwl threw load() exceptionjavax.servlet.UnavailableException: XPathFactory#newInstance() failed to create an XPathFactory for the default object model: http://java.sun.com/jaxp/xpath/dom with the XPathFactoryConfigurationException: javax.xml.xpath.XPathFactoryConfigurationException: No XPathFctory implementation found for the object model: http://java.sun.com/jaxp/xpath/domat flex.messaging.MessageBrokerServlet.init(MessageBrokerServlet.java:170)at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1139)at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:966)at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3956)at org.apache.catalina.core.StandardContext.start(StandardContext.java:4230)at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:926)at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:889)at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1149)at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)at org.apache.catalina.core.StandardService.start(StandardService.java:448)at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)at org.apache.catalina.startup.Catalina.start(Catalina.java:552)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)  

 

 

 

 

解决方法：在工程中加入 xalan.jar (我只加了这个就可以)，xerces-2.6.2.jar，xercesImpl.jar，xml-apis.jar。