Hi Eugen,
see below
etvc wrote:
  Hello! Can anyone help me?
 I tried to install Xwiki Enterprise 1.8 on Jetty and OracleXE 10.2 (I used
 Windows). I did all steps according to instalation instruction "Installing
 the XWiki WAR manually" and instructions about Jetty and Oracle instalation
 and configuring, EXACTLY as its wrote.
 All is ok, exept one thing: I found, that one moment is missing in xwiki
 instructions. When you installing OracleXE, automaticly configuring APEX
 (web-interface of Oracle XE) with HTTP port 8080 and Jetty (by default) also
 uses same port. For this reason, I changed port in Oracle.
 Now Jetty works fine, but when I trying 
http://localhost:8080/xwiki I
 receiving the folowing:
 HTTP ERROR 500
 Problem accessing /xwiki/bin/view/Main/. Reason:
     Error number 3 in 0: Could not initialize main XWiki context
 Wrapped Exception: Error number 3001 in 3: Cannot load class
 com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager from
 param xwiki.store.migration.manager.class
 Wrapped Exception: Error number 0 in 3: Exception while hibernate execute
 Wrapped Exception: Could not parse mapping document from resource
 xwiki.oracle.hbm.xml
 Caused by:
 com.xpn.xwiki.XWikiException: Error number 3 in 0: Could not initialize main
 XWiki context
 Wrapped Exception: Error number 3001 in 3: Cannot load class
 com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager from
 param xwiki.store.migration.manager.class
 Wrapped Exception: Error number 0 in 3: Exception while hibernate execute
 Wrapped Exception: Could not parse mapping document from resource
 xwiki.oracle.hbm.xml
        at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:326)
        at com.xpn.xwiki.XWiki.getXWiki(XWiki.java:387)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:135)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115)
        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:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
        at
 com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:145)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:111)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at
 com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:68)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at
com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:295)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at
com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:378)
        at
 org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
        at
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
        at
 org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
        at
 org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:865)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at
 org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
        at
 org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)
 Wrapped Exception:
 com.xpn.xwiki.XWikiException: Error number 3001 in 3: Cannot load class
 com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager from
 param xwiki.store.migration.manager.class
 Wrapped Exception: Error number 0 in 3: Exception while hibernate execute
 Wrapped Exception: Could not parse mapping document from resource
 xwiki.oracle.hbm.xml
        at com.xpn.xwiki.XWiki.createClassFromConfig(XWiki.java:1002)
        at com.xpn.xwiki.XWiki.initXWiki(XWiki.java:726)
        at com.xpn.xwiki.XWiki.(XWiki.java:668)
        at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:316)
        at com.xpn.xwiki.XWiki.getXWiki(XWiki.java:387)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:135)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115)
        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:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
        at
 com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:145)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:111)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at
 com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:68)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at
com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:295)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at
com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:378)
        at
 org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
        at
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
        at
 org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
        at
 org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:865)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at
 org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
        at
 org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)
 Wrapped Exception:
 com.xpn.xwiki.XWikiException: Error number 0 in 3: Exception while hibernate
 execute
 Wrapped Exception: Could not parse mapping document from resource
 xwiki.oracle.hbm.xml
        at
  
[snip]
 Wrapped Exception:
 org.hibernate.DuplicateMappingException: Duplicate class/entity mapping
 com.xpn.xwiki.doc.XWikiDocument 
It looks like somehow the xwiki.oracle.hbm.xml is duplicating the mappings,
which means they have been done before at some point.
Can you double-check the <mapping> elements in your hibernate.cfg.xml ?
Happy coding,
Anca Luca
          at
org.hibernate.cfg.Mappings.addClass(Mappings.java:118)
        at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:145)
        at org.hibernate.cfg.Configuration.add(Configuration.java:675)
        at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:510)
        at org.hibernate.cfg.Configuration.addResource(Configuration.java:572)
        at
 org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1593)
        at
 org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1561)
        at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1540)
        at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1514)
        at org.hibernate.cfg.Configuration.configure(Configuration.java:1434)
        at
com.xpn.xwiki.store.XWikiHibernateBaseStore.initHibernate(XWikiHibernateBaseStore.java:141)
        at
com.xpn.xwiki.store.XWikiHibernateBaseStore.checkHibernate(XWikiHibernateBaseStore.java:562)
        at
 com.xpn.xwiki.store.XWikiHibernateBaseStore.execute(XWikiHibernateBaseStore.java:1038)
        at
com.xpn.xwiki.store.XWikiHibernateBaseStore.executeRead(XWikiHibernateBaseStore.java:1082)
        at
com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager.getDBVersion(XWikiHibernateMigrationManager.java:68)
        at
com.xpn.xwiki.store.migration.AbstractXWikiMigrationManager.(AbstractXWikiMigrationManager.java:68)
        at
com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager.(XWikiHibernateMigrationManager.java:51)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
 Source)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at com.xpn.xwiki.XWiki.createClassFromConfig(XWiki.java:994)
        at com.xpn.xwiki.XWiki.initXWiki(XWiki.java:726)
        at com.xpn.xwiki.XWiki.(XWiki.java:668)
        at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:316)
        at com.xpn.xwiki.XWiki.getXWiki(XWiki.java:387)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:135)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115)
        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:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
        at
 com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:145)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:111)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at
 com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:68)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at
com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:295)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at
com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112)
        at
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:378)
        at
 org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
        at
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
        at
 org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
        at
 org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:865)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at
 org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
        at
 org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)
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 I checked to many times hibernate.cfg.xml - all is ok (according
 instructions). I ONLY deleted comments for oracle part. Please help me!!!
 --
 Thanks in advice!
 Eugen Colesnicov