如何解决 tomcat 与 commons-digester.jar 加载冲突问题？

[m99c]

在Eclipse的Debug页面 Java Application 中 启动 tomcat，
要是添加commons-digester.jar 到 classpath，
就会造成tomcat启动不了，错误信息为：

10 [main] ERROR digester.Digester - Begin event threw exception
java.lang.ClassNotFoundException: org.apache.catalina.core.StandardServer
at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at org.apache.commons.digester.ObjectCreateRule.begin(ObjectCreateRule.java:252)
at org.apache.commons.digester.Rule.begin(Rule.java:200)
at org.apache.commons.digester.Digester.startElement(Digester.java:1273)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:454)
at org.apache.xerces.impl.XMLNamespaceBinder.startElement(XMLNamespaceBinder.java:571)
at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(XMLDTDValidator.java:756)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:752)
at org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(XMLDocumentScannerImpl.java:942)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1520)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:333)
at org.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:524)
at org.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:580)
at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:152)
at org.apache.xerces.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1169)
at org.apache.commons.digester.Digester.parse(Digester.java:1548)
at org.apache.catalina.startup.Catalina.start(Catalina.java:449)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
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:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
Catalina.start: java.lang.ClassNotFoundException: org.apache.catalina.core.StandardServer
java.lang.ClassNotFoundException: org.apache.catalina.core.StandardServer
at org.apache.commons.digester.Digester.createSAXException(Digester.java:2540)
at org.apache.commons.digester.Digester.createSAXException(Digester.java:2566)
at org.apache.commons.digester.Digester.startElement(Digester.java:1276)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:454)
at org.apache.xerces.impl.XMLNamespaceBinder.startElement(XMLNamespaceBinder.java:571)
at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(XMLDTDValidator.java:756)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:752)
at org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(XMLDocumentScannerImpl.java:942)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1520)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:333)
at org.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:524)
at org.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:580)
at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:152)
at org.apache.xerces.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1169)
at org.apache.commons.digester.Digester.parse(Digester.java:1548)
at org.apache.catalina.startup.Catalina.start(Catalina.java:449)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
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:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)

[whyxx]

我这边都可以呀,不过我是将这个jar放在自己工程的WEB-INF\lib目录下的,不知道你是怎么用的

[m99c]

我是在项目中添加 bootstrap.jar 启动 tomcat，
在Eclipse Debug 指定-Dcatalina.home=C:\Tomcat 。

classpath 添加的commons-digester.jar 也是在
workspace，
启动的是C:\Tomcat ,但是Eclipse Debug时只会使用它自己定义的classpath，
不会用到 WEB-INF\lib 里边的 jar

[willmas]

我也碰到了，不过我是在jbuilder里用struts1.1，因为它带着digest，结果tomcat启动不了，奇怪的是我把这个jar从struts的lib里删了它还是报同样的错误

[willmas]

我的common-digester.jar都从workspace删掉了，我看classpath里都没有了，可是还是不行

[m99c]

我自己估计是 workspace 中的 commons-digester.jar
比 tomcat 目录下 server\lib的commons-digester.jar 太早加载，
导致 catalinaLoader 出问题，不知如何解决？

[m99c]

谢谢各位，我的问题解决了!
Bootstrap 从ClassLoaderFactry中先调入 commonLoader ，jar文件的CLASSPATH是common\endorsed和common\lib，
再调入catalinaLoader， jar文件的CLASSPATH是server\lib

我在 Eclipse 的 classpath 把 tomcat下的 common\lib 的所有jar文件作为 External Jars 加入，再把server\lib的所有jar文件作为External Jars 加入。
这样就行了！