XFire在Websphere Application Server5.1里运行的空指针异常的解决

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我是靠谱客的博主虚心裙子，最近开发中收集的这篇文章主要介绍XFire在Websphere Application Server5.1里运行的空指针异常的解决，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

最近在部署Server方面碰到了一个非常棘手的问题，在WAS5.1上部署App server成功没有任何异常，客户端连接和操作没有任何问题。当用到了一个特殊的服务时，出现了问题，这个服务又和Web Service相关，项目里用到了Web Service作为另一部分的业务支持。但是有意思的是在RAD+WAS Test Environment的开发环境下没有一点问题，却偏偏在本地QA环境下不行。后来发现请求wsdl文件时也会出类似异常。

本地QA环境如下：（真实QA环境部署在Soloris下）

OS: Windows XP

软件架构：WAS 5.1＋Sonic MQ6.1 + Oracle10g （全部都是单服务器）

XFire 1.2.5

抛出异常：

[Servlet Error]-[org/codehaus/xfire/xmlbeans/XmlBeansWSDLBuilder]: java.lang.NoClassDefFoundError: org/codehaus/xfire/xmlbeans/XmlBeansWSDLBuilder

at org.codehaus.xfire.xmlbeans.XmlBeansWSDLBuilderFactory.createWSDLBuilder(XmlBeansWSDLBuilderFactory.java:20)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilderAdapter.write(WSDLBuilderAdapter.java:40)
at org.codehaus.xfire.DefaultXFire.generateWSDL(DefaultXFire.java:104)
at org.codehaus.xfire.transport.http.XFireServletController.generateWSDL(XFireServletController.java:380)
at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:125)
at org.codehaus.xfire.transport.http.XFireServlet.doGet(XFireServlet.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:974)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:555)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:200)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:119)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:276)
at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.cache.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:114)
at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:186)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:618)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:443)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:593)

看到这个异常一般大家都会以为是classpath没配置好或者缺少相应jar包。我也是这么做的，于是检查了下，但是该jar确实存在，classpath理论上没有问题。于是重新打包重新部署，几次折腾之后，异常出现了变化：

E SRVE0026E: [Servlet Error]-[Provider null could not be instantiated: java.lang.NullPointerException]: javax.xml.stream.FactoryConfigurationError: Provider null could not be instantiated: java.lang.NullPointerException
at javax.xml.stream.FactoryFinder.newInstance(FactoryFinder.java:75)
at javax.xml.stream.FactoryFinder.find(FactoryFinder.java:136)
at javax.xml.stream.FactoryFinder.find(FactoryFinder.java:92)
at javax.xml.stream.XMLInputFactory.newInstance(XMLInputFactory.java:136)
at at org.codehaus.xfire.util.STAXUtils.<clinit>(STAXUtils.java:48).null(Unknown Source)
at org.codehaus.xfire.util.jdom.StaxBuilder.<init>(StaxBuilder.java:150)
at at org.codehaus.xfire.wsdl.AbstractWSDL.<clinit>(AbstractWSDL.java:43).null(Unknown Source)
at org.codehaus.xfire.xmlbeans.XmlBeansWSDLBuilderFactory.createWSDLBuilder(XmlBeansWSDLBuilderFactory.java:20)
at org.codehaus.xfire.wsdl11.builder.WSDLBuilderAdapter.write(WSDLBuilderAdapter.java:40)
at org.codehaus.xfire.DefaultXFire.generateWSDL(DefaultXFire.java:104)
at org.codehaus.xfire.transport.http.XFireServletController.generateWSDL(XFireServletController.java:380)
at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:125)
at org.codehaus.xfire.transport.http.XFireServlet.doGet(XFireServlet.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:974)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:555)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:200)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:119)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:276)
at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:618)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:439)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java(Compiled Code))

这次没辙了，Google了下，发现中文资料还真是稀少（用这种架构的不多，毕竟都是狂贵的东东），在一堆英文网页里挖掘发现还是有人碰到类似的问题，其中MS有个是IBM的人说把WAS里java/jre/lib里的两个properties文件：jaxp.properties和Xerces.properties里最下面被注释的属性去掉注释，给设置回来可以解决。看了下，是下面三行属性设置。

＃javax.xml.transform.TransformerFactory=org.apache.xalan.processor.TransformerFactoryImpl
＃javax.xml.parsers.SAXParserFactory=org.apache.xerces.jaxp.SAXParserFactoryImpl
＃javax.xml.parsers.DocumentBuilderFactory=org.apache.xerces.jaxp.DocumentBuilderFactoryImpl

看这些类还真像回事，蛮以为去掉注释，哈雷路亚搞定了，不想，试了下还是不行。继续搜索着偶然发现了下面的一段话：

I've seen some posts which relate to this issue, so I've tried to add an '
xml.stream.properties' file with these settings:

javax.xml.stream.XMLInputFactory=com.ctc.wstx.stax.WstxInputFactory
javax.xml.stream.XMLOutputFactory=com.ctc.wstx.stax.WstxOutputFactory
javax.xml.stream.XMLEventFactory=com.ctc.wstx.stax.WstxEventFactory

into my web app lib directory, but I'm still getting the error.

想了想，把他的属性设置拷贝进那个IBM的人说的两个文件的，然后stop server，保存文件，重启server，再试了一次，OK搞定，yeah！

但是想不通的是，在RAD的开发环境里也是一样的设置，为什么那个没有问题。由于IBM的那套东西不能debug，折腾这个剩下的矛盾已没有意义。WAS6已经出来，希望在新的版本平台上没有这个问题:-)