It violates the Sun classloading spec to load endorsed classes from WEB-INF/lib or WEB-INF/classes. There are a number of bugs that have been filed on this and the conclusion of all of them is that Tomcat simply won't support any sort of overriding of XML or DOM libraries from the webapp classloader. If you want to override jdk1.4.x endorsed packages, you must use common/endorsed. If you just want to use specific xerces classes, you can remove them from common/endorsed (and make sure they don't exist in common/lib). Then, create a separate instance of Tomcat using CATALINA_BASE and create a CATALINA_BASE/shared/lib directory. Put your xerces jar there and your app will use your custom version of Xerces rather than any default ones that Tomcat provides.
That is the only way I know to use a specific version of xerces per/app. Of course you can always just replace Tomcat's version of xerces with yours and force all apps to your yours by putting it in common/endorsed.
Jake
At 06:47 PM 1/11/2003 -0800, you wrote:
Hi all,
Is there a way for webapps to declare jars that can override jars in Tomcat's common/endorsed directory? For example, if I want to my webapp to use a specific version of Xerces, independent of what gets distributed with Tomcat, what do I have to do? Right now, with Tomcat 4.1.18, if I have a copy of xercesImpl.jar in /WEB-INF/lib I get:
Exception during startup processing
java.lang.reflect.InvocationTargetException
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)
Caused by: java.lang.VerifyError: Cannot inherit from final class
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:509)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1664)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:953)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1394)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1274)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:322)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.createContentDispatcher(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.<init>(XMLDocumentFragmentScannerImpl.java:249)
at org.apache.xerces.impl.XMLDocumentScannerImpl.<init>(XMLDocumentScannerImpl.java:245)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.<init>(Unknown Source)
at org.apache.xerces.parsers.IntegratedParserConfiguration.createDocumentScanner(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.<init>(DTDConfiguration.java:367)
at org.apache.xerces.parsers.StandardParserConfiguration.<init>(StandardParserConfiguration.java:198)
at org.apache.xerces.parsers.IntegratedParserConfiguration.<init>(Unknown Source)
at org.apache.xerces.parsers.IntegratedParserConfiguration.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:296)
at java.lang.Class.newInstance(Class.java:249)
at org.apache.xerces.util.ObjectFactory.newInstance(ObjectFactory.java:266)
at org.apache.xerces.util.ObjectFactory.findJarServiceProvider(ObjectFactory.java:360)
at org.apache.xerces.util.ObjectFactory.createObject(ObjectFactory.java:185)
at org.apache.xerces.util.ObjectFactory.createObject(ObjectFactory.java:120)
at org.apache.xerces.parsers.SAXParser.<init>(SAXParser.java:140)
at org.apache.xerces.parsers.SAXParser.<init>(SAXParser.java:125)
at org.apache.xerces.jaxp.SAXParserImpl.<init>(SAXParserImpl.java:102)
at org.apache.xerces.jaxp.SAXParserFactoryImpl.newSAXParser(SAXParserFactoryImpl.java:95)
at org.apache.commons.digester.Digester.getParser(Digester.java:676)
at org.apache.commons.digester.Digester.getXMLReader(Digester.java:892)
at org.apache.commons.digester.Digester.parse(Digester.java:1495)
at org.apache.catalina.startup.ContextConfig.defaultConfig(ContextConfig.java:548)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:638)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:243)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3567)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:738)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:347)
at org.apache.catalina.core.StandardService.start(StandardService.java:497)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2189)
at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
... 5 more
Any help on this would be greatly appreciated. Please cc: me in when responding since I'm not subscribed to the tomcat-user mailing list.
Thanks,
-Mark
P/S - it would have been a great help if the error message included which jarfile it was barfing on!
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