2008-05-30 18:02:01,359 [] [P1-19] WARN  action.RequestProcessor         - Unhandled Exception thrown: class java.lang.RuntimeException 
18:02:01.360 WARN!! [P1-19] org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:589) >11> /xwiki/bin/view/Main/: 
java.lang.RuntimeException: Failed to load component [com.xpn.xwiki.render.VelocityManager] for hint [default]
        at com.xpn.xwiki.web.Utils.getComponent(Utils.java:531)
        at com.xpn.xwiki.web.Utils.getComponent(Utils.java:547)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:186)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:116)
        at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:596)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:428)
        at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:830)
        at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112)
        at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:821)
        at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:471)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
        at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:633)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
        at org.mortbay.http.HttpServer.service(HttpServer.java:954)
        at org.mortbay.http.HttpConnection.service(HttpConnection.java:816)
        at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:983)
        at org.mortbay.http.HttpConnection.handle(HttpConnection.java:833)
        at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
        at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
        at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
Caused by: org.xwiki.component.manager.ComponentLookupException: Failed to lookup component role [com.xpn.xwiki.render.VelocityManager] for hint [default]
        at org.xwiki.plexus.manager.PlexusComponentManager.lookup(PlexusComponentManager.java:58)
        at com.xpn.xwiki.web.Utils.getComponent(Utils.java:529)
        ... 25 more
Caused by: org.codehaus.plexus.component.repository.exception.ComponentLookupException: Unable to lookup component 'com.xpn.xwiki.render.VelocityManager', it could not be created
        at org.codehaus.plexus.DefaultComponentLookupManager.lookup(DefaultComponentLookupManager.java:151)
        at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:277)
        at org.codehaus.plexus.personality.plexus.lifecycle.phase.PlexusContainerLocator.lookup(PlexusContainerLocator.java:51)
        at org.xwiki.plexus.manager.PlexusComponentManager.lookup(PlexusComponentManager.java:56)
        ... 26 more
Caused by: org.codehaus.plexus.component.factory.ComponentInstantiationException: Could not instantiate component: role: 'com.xpn.xwiki.render.VelocityManager', implementation: 'com.xpn.xwiki.render.DefaultVelocityManager', role hint: 'default' realm: plexus.core
        at org.codehaus.plexus.component.factory.java.JavaComponentFactory.makeException(JavaComponentFactory.java:113)
        at org.codehaus.plexus.component.factory.java.JavaComponentFactory.newInstance(JavaComponentFactory.java:87)
        at org.codehaus.plexus.component.manager.AbstractComponentManager.createComponentInstance(AbstractComponentManager.java:239)
        at org.codehaus.plexus.component.manager.AbstractComponentManager.createComponentInstance(AbstractComponentManager.java:128)
        at org.codehaus.plexus.component.manager.ClassicSingletonComponentManager.getComponent(ClassicSingletonComponentManager.java:90)
        at org.codehaus.plexus.DefaultComponentLookupManager.lookup(DefaultComponentLookupManager.java:147)
        ... 29 more
Caused by: java.lang.LinkageError: duplicate class definition: com/xpn/xwiki/render/DefaultVelocityManager
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at org.mortbay.http.ContextLoader.loadClass(ContextLoader.java:225)
        at org.mortbay.http.ContextLoader.loadClass(ContextLoader.java:193)
        at org.codehaus.plexus.classworlds.strategy.ForeignStrategy.loadClass(ForeignStrategy.java:35)
        at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:201)
        at org.codehaus.plexus.component.factory.java.JavaComponentFactory.newInstance(JavaComponentFactory.java:48)
        ... 33 more