Java民工的鐵皮房

場景：運行運用了Struts2.0 framework的項目時發生的錯誤。

環境：sun jdk1.5.0_15 + tomcat 5.0.28

原本以為自己玩了eclipse和myeclipse這么多年，一向項目的配置發布用myeclipse雖然沒有駕輕就熟，但是至少不會被難道，這次確倒在了這個jdk 1.5及tomcat 5.0.28的環境上。誰叫以前一直沒有試過在tomcat5.0.28上發布struts2呢，剛好現在客戶說一定要用struts2，剛好自己也想償償新，卻償到了這個苦頭。開始還以為是自己用myelipse deploy的問題，結果卻不是，為啥別人的tomcat5.5就能好好的run呢？廢話不少說，現在就看以下exception：

完整的Exception：
Exception starting filter struts2
javax.xml.transform.TransformerFactoryConfigurationError: Provider org.apache.xalan.processor.TransformerFactoryImpl not found
 at javax.xml.transform.TransformerFactory.newInstance(Unknown Source)
 at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<clinit>(DomHelper.java:167)
 at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:115)
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:786)
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments(XmlConfigurationProvider.java:132)
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:100)
 at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:130)
 at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
 at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:398)
 at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:455)
 at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:201)
 at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:225)
 at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:308)
 at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:79)
 at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3698)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4349)
 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:823)
 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)
 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)
 at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:277)
 at org.apache.catalina.core.StandardHost.install(StandardHost.java:832)
 at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:701)
 at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:432)
 at org.apache.catalina.startup.HostConfig.start(HostConfig.java:983)
 at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:349)
 at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1091)
 at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
 at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
 at org.apache.catalina.core.StandardService.start(StandardService.java:480)
 at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)
 at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
 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:585)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)

錯誤原因：
認為是由于jdk1.5 與 tomcat5.0之間的關于 TransformerFactoryImpl 類的沖突造成的。
tomcat-5.0.28\common\endorsed下有兩個jar包：xercesImpl.jar和xml-apis.jar，其中的類 javax.xml.transform.TransformerFactory 與jdk1.5中的類org.apache.xalan.processor.TransformerFactoryImpl其實是同一個類。
in tomcat java is called with the following argument:
-Djava.endorsed.dirs="X:\my_app\Portal\tomcat\common\endorsed"
In this directory you find two jar files: xercesImpl.jar and xml-apis.jar needed by tomcat and that must be loaded before all xmsl stuff present in the jdk (1.4 naming problem). And in the file xml-apis.jar the TransformerFactoryImpl is set to "org.apache.xalan.processor.TransformerFactoryImpl".

解決辦法：
1. 將xml-apis.jar移出endorsed文件夾。
2. 用xalan系列jar包替換原來的xercesImpl.jar和xml-apis.jar。
   xalan系列jar包：serializer.jar、xalan.jar、xercesImpl.jar和xml-apis.jar。
3. For other application, just check this file or dom3-xml-apis.jar in your class path.

（以上參考小立飛刀的TransformerFactoryImpl not found exception一文，也謝謝作者解答這個難題）