javax.management.InstanceAlreadyExistsException: org.xwiki:type=Velocity,domain=Engines,name=default

XWiki.org JIRA | Vincent Massol | 5 years ago
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  1. 0

    from time to time the following error appears at startup in the console: {noformat} 2012-05-25 19:47:04,147 [Lucene Index Rebuilder] WARN m.i.DefaultJMXBeanRegistration - Failed to register resource with name [type=Velocity,domain=Engines,name=default] ... {noformat} The reason is because 2 threads execute at the same time (the main request thread and the Lucene Index Rebuilder thread) and they both call DefaultVelocityManager.getVelocityEngine() at the same time. This method in turn calls VelocityFactory.createVelocityEngine() which registers the new Velocity Engine against the JMX server, leading to an error because the second time it executes the JM MBean is already registered. In practice this means that we create 2 Velocity Engine when we should only create one. FTR here are the logs that allowed me to capture the issue; {noformat} 2012-05-25 19:47:03,690 [http://localhost:8080/xwiki/bin/view/Main/WebHome] INFO m.i.DefaultJMXBeanRegistration - Registering MBean: [org.xwiki.velocity.internal.jmx.JMXVelocityEngine@763c3a45] with name [type=Velocity,domain=Engines,name=default] at [java.lang.RuntimeException at org.xwiki.management.internal.DefaultJMXBeanRegistration.registerMBean(DefaultJMXBeanRegistration.java:55) at org.xwiki.velocity.internal.DefaultVelocityFactory.createVelocityEngine(DefaultVelocityFactory.java:95) at com.xpn.xwiki.render.DefaultVelocityManager.getVelocityEngine(DefaultVelocityManager.java:211) at org.xwiki.display.internal.AbstractDocumentTitleDisplayer.evaluateTitle(AbstractDocumentTitleDisplayer.java:168) at org.xwiki.display.internal.AbstractDocumentTitleDisplayer.display(AbstractDocumentTitleDisplayer.java:107) at org.xwiki.display.internal.AbstractDocumentTitleDisplayer.display(AbstractDocumentTitleDisplayer.java:50) at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:80) at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:38) at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:111) at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:50) at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:67) at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:41) at com.xpn.xwiki.doc.XWikiDocument.getRenderedTitle(XWikiDocument.java:1145) at com.xpn.xwiki.plugin.lucene.AbstractDocumentData.<init>(AbstractDocumentData.java:109) at com.xpn.xwiki.plugin.lucene.DocumentData.<init>(DocumentData.java:62) at com.xpn.xwiki.plugin.lucene.IndexUpdater.queueDocument(IndexUpdater.java:324) at com.xpn.xwiki.plugin.lucene.IndexUpdater.onEvent(IndexUpdater.java:395) at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:261) at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:226) at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:1413) at com.xpn.xwiki.plugin.scheduler.SchedulerPlugin.updateSchedulerJobClass(SchedulerPlugin.java:698) at com.xpn.xwiki.plugin.scheduler.SchedulerPlugin.init(SchedulerPlugin.java:128) at com.xpn.xwiki.plugin.XWikiPluginManager.initPlugin(XWikiPluginManager.java:152) at com.xpn.xwiki.plugin.XWikiPluginManager.addPlugin(XWikiPluginManager.java:88) at com.xpn.xwiki.plugin.XWikiPluginManager.addPlugins(XWikiPluginManager.java:116) at com.xpn.xwiki.XWiki.preparePlugins(XWiki.java:1123) at com.xpn.xwiki.XWiki.initXWiki(XWiki.java:793) at com.xpn.xwiki.XWiki.<init>(XWiki.java:738) at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:399) at com.xpn.xwiki.XWiki.getXWiki(XWiki.java:486) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:136) 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:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:538) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1352) at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:120) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323) at org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:144) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323) at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:66) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323) at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323) at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:476) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:517) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:225) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:937) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:406) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:871) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:247) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110) at org.eclipse.jetty.server.Server.handle(Server.java:346) at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:589) at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:1048) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:601) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:214) at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:411) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:535) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:40) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:529) at java.lang.Thread.run(Thread.java:680) ] 2012-05-25 19:47:04,052 [Lucene Index Rebuilder] INFO m.i.DefaultJMXBeanRegistration - Registering MBean: [org.xwiki.velocity.internal.jmx.JMXVelocityEngine@6f7750ef] with name [type=Velocity,domain=Engines,name=default] at [java.lang.RuntimeException at org.xwiki.management.internal.DefaultJMXBeanRegistration.registerMBean(DefaultJMXBeanRegistration.java:55) at org.xwiki.velocity.internal.DefaultVelocityFactory.createVelocityEngine(DefaultVelocityFactory.java:95) at com.xpn.xwiki.render.DefaultVelocityManager.getVelocityEngine(DefaultVelocityManager.java:211) at org.xwiki.display.internal.AbstractDocumentTitleDisplayer.evaluateTitle(AbstractDocumentTitleDisplayer.java:168) at org.xwiki.display.internal.AbstractDocumentTitleDisplayer.display(AbstractDocumentTitleDisplayer.java:107) at org.xwiki.display.internal.AbstractDocumentTitleDisplayer.display(AbstractDocumentTitleDisplayer.java:50) at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:80) at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:38) at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:111) at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:50) at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:67) at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:41) at com.xpn.xwiki.doc.XWikiDocument.getRenderedTitle(XWikiDocument.java:1145) at com.xpn.xwiki.plugin.lucene.AbstractDocumentData.<init>(AbstractDocumentData.java:109) at com.xpn.xwiki.plugin.lucene.DocumentData.<init>(DocumentData.java:62) at com.xpn.xwiki.plugin.lucene.IndexUpdater.queueDocument(IndexUpdater.java:324) at com.xpn.xwiki.plugin.lucene.IndexRebuilder.addTranslationOfDocument(IndexRebuilder.java:390) at com.xpn.xwiki.plugin.lucene.IndexRebuilder.addTranslationOfDocument(IndexRebuilder.java:378) at com.xpn.xwiki.plugin.lucene.IndexRebuilder.indexDocuments(IndexRebuilder.java:344) at com.xpn.xwiki.plugin.lucene.IndexRebuilder.indexWiki(IndexRebuilder.java:310) at com.xpn.xwiki.plugin.lucene.IndexRebuilder.rebuildIndex(IndexRebuilder.java:265) at com.xpn.xwiki.plugin.lucene.IndexRebuilder.runInternal(IndexRebuilder.java:216) at com.xpn.xwiki.util.AbstractXWikiRunnable.run(AbstractXWikiRunnable.java:110) at java.lang.Thread.run(Thread.java:680) ] 2012-05-25 19:47:04,147 [Lucene Index Rebuilder] WARN m.i.DefaultJMXBeanRegistration - Failed to register resource with name [type=Velocity,domain=Engines,name=default] javax.management.InstanceAlreadyExistsException: org.xwiki:type=Velocity,domain=Engines,name=default at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453) ~[na:1.6.0_31] at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484) ~[na:1.6.0_31] at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963) ~[na:1.6.0_31] at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917) ~[na:1.6.0_31] at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312) ~[na:1.6.0_31] at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:482) ~[na:1.6.0_31] at org.xwiki.management.internal.DefaultJMXBeanRegistration.registerMBean(DefaultJMXBeanRegistration.java:62) ~[xwiki-commons-management-4.1-SNAPSHOT.jar:na] at org.xwiki.velocity.internal.DefaultVelocityFactory.createVelocityEngine(DefaultVelocityFactory.java:95) [xwiki-commons-velocity-4.1-20120523.144758-63.jar:na] at com.xpn.xwiki.render.DefaultVelocityManager.getVelocityEngine(DefaultVelocityManager.java:211) [xwiki-platform-legacy-oldcore-4.1-20120523.221259-159.jar:na] at org.xwiki.display.internal.AbstractDocumentTitleDisplayer.evaluateTitle(AbstractDocumentTitleDisplayer.java:168) [xwiki-platform-display-api-4.1-20120523.212404-230.jar:na] at org.xwiki.display.internal.AbstractDocumentTitleDisplayer.display(AbstractDocumentTitleDisplayer.java:107) [xwiki-platform-display-api-4.1-20120523.212404-230.jar:na] at org.xwiki.display.internal.AbstractDocumentTitleDisplayer.display(AbstractDocumentTitleDisplayer.java:50) [xwiki-platform-display-api-4.1-20120523.212404-230.jar:na] at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:80) [xwiki-platform-display-api-4.1-20120523.212404-230.jar:na] at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:38) [xwiki-platform-display-api-4.1-20120523.212404-230.jar:na] at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:111) [xwiki-platform-sheet-api-4.1-20120523.212414-230.jar:na] at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:50) [xwiki-platform-sheet-api-4.1-20120523.212414-230.jar:na] at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:67) [xwiki-platform-display-api-4.1-20120523.212404-230.jar:na] at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:41) [xwiki-platform-display-api-4.1-20120523.212404-230.jar:na] at com.xpn.xwiki.doc.XWikiDocument.getRenderedTitle(XWikiDocument.java:1145) [xwiki-platform-legacy-oldcore-4.1-20120523.221259-159.jar:na] at com.xpn.xwiki.plugin.lucene.AbstractDocumentData.<init>(AbstractDocumentData.java:109) [xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na] at com.xpn.xwiki.plugin.lucene.DocumentData.<init>(DocumentData.java:62) [xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na] at com.xpn.xwiki.plugin.lucene.IndexUpdater.queueDocument(IndexUpdater.java:324) [xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na] at com.xpn.xwiki.plugin.lucene.IndexRebuilder.addTranslationOfDocument(IndexRebuilder.java:390) [xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na] at com.xpn.xwiki.plugin.lucene.IndexRebuilder.addTranslationOfDocument(IndexRebuilder.java:378) [xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na] at com.xpn.xwiki.plugin.lucene.IndexRebuilder.indexDocuments(IndexRebuilder.java:344) [xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na] at com.xpn.xwiki.plugin.lucene.IndexRebuilder.indexWiki(IndexRebuilder.java:310) [xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na] at com.xpn.xwiki.plugin.lucene.IndexRebuilder.rebuildIndex(IndexRebuilder.java:265) [xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na] at com.xpn.xwiki.plugin.lucene.IndexRebuilder.runInternal(IndexRebuilder.java:216) [xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na] at com.xpn.xwiki.util.AbstractXWikiRunnable.run(AbstractXWikiRunnable.java:110) [xwiki-platform-legacy-oldcore-4.1-20120523.221259-159.jar:na] at java.lang.Thread.run(Thread.java:680) [na:1.6.0_31] {noformat}

    XWiki.org JIRA | 5 years ago | Vincent Massol
    javax.management.InstanceAlreadyExistsException: org.xwiki:type=Velocity,domain=Engines,name=default
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Root Cause Analysis

  1. javax.management.InstanceAlreadyExistsException

    org.xwiki:type=Velocity,domain=Engines,name=default

    at com.sun.jmx.mbeanserver.Repository.addMBean()
  2. Java RT
    JmxMBeanServer.registerMBean
    1. com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453)[na:1.6.0_31]
    2. com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484)[na:1.6.0_31]
    3. com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963)[na:1.6.0_31]
    4. com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917)[na:1.6.0_31]
    5. com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312)[na:1.6.0_31]
    6. com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:482)[na:1.6.0_31]
    6 frames
  3. org.xwiki.management
    DefaultJMXBeanRegistration.registerMBean
    1. org.xwiki.management.internal.DefaultJMXBeanRegistration.registerMBean(DefaultJMXBeanRegistration.java:62)[xwiki-commons-management-4.1-SNAPSHOT.jar:na]
    1 frame
  4. org.xwiki.velocity
    DefaultVelocityFactory.createVelocityEngine
    1. org.xwiki.velocity.internal.DefaultVelocityFactory.createVelocityEngine(DefaultVelocityFactory.java:95)[xwiki-commons-velocity-4.1-20120523.144758-63.jar:na]
    1 frame
  5. com.xpn.xwiki
    DefaultVelocityManager.getVelocityEngine
    1. com.xpn.xwiki.render.DefaultVelocityManager.getVelocityEngine(DefaultVelocityManager.java:211)[xwiki-platform-legacy-oldcore-4.1-20120523.221259-159.jar:na]
    1 frame
  6. org.xwiki.display
    DefaultDocumentDisplayer.display
    1. org.xwiki.display.internal.AbstractDocumentTitleDisplayer.evaluateTitle(AbstractDocumentTitleDisplayer.java:168)[xwiki-platform-display-api-4.1-20120523.212404-230.jar:na]
    2. org.xwiki.display.internal.AbstractDocumentTitleDisplayer.display(AbstractDocumentTitleDisplayer.java:107)[xwiki-platform-display-api-4.1-20120523.212404-230.jar:na]
    3. org.xwiki.display.internal.AbstractDocumentTitleDisplayer.display(AbstractDocumentTitleDisplayer.java:50)[xwiki-platform-display-api-4.1-20120523.212404-230.jar:na]
    4. org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:80)[xwiki-platform-display-api-4.1-20120523.212404-230.jar:na]
    5. org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:38)[xwiki-platform-display-api-4.1-20120523.212404-230.jar:na]
    5 frames
  7. org.xwiki.sheet
    SheetDocumentDisplayer.display
    1. org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:111)[xwiki-platform-sheet-api-4.1-20120523.212414-230.jar:na]
    2. org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:50)[xwiki-platform-sheet-api-4.1-20120523.212414-230.jar:na]
    2 frames
  8. org.xwiki.display
    ConfiguredDocumentDisplayer.display
    1. org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:67)[xwiki-platform-display-api-4.1-20120523.212404-230.jar:na]
    2. org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:41)[xwiki-platform-display-api-4.1-20120523.212404-230.jar:na]
    2 frames
  9. com.xpn.xwiki
    AbstractXWikiRunnable.run
    1. com.xpn.xwiki.doc.XWikiDocument.getRenderedTitle(XWikiDocument.java:1145)[xwiki-platform-legacy-oldcore-4.1-20120523.221259-159.jar:na]
    2. com.xpn.xwiki.plugin.lucene.AbstractDocumentData.<init>(AbstractDocumentData.java:109)[xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na]
    3. com.xpn.xwiki.plugin.lucene.DocumentData.<init>(DocumentData.java:62)[xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na]
    4. com.xpn.xwiki.plugin.lucene.IndexUpdater.queueDocument(IndexUpdater.java:324)[xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na]
    5. com.xpn.xwiki.plugin.lucene.IndexRebuilder.addTranslationOfDocument(IndexRebuilder.java:390)[xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na]
    6. com.xpn.xwiki.plugin.lucene.IndexRebuilder.addTranslationOfDocument(IndexRebuilder.java:378)[xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na]
    7. com.xpn.xwiki.plugin.lucene.IndexRebuilder.indexDocuments(IndexRebuilder.java:344)[xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na]
    8. com.xpn.xwiki.plugin.lucene.IndexRebuilder.indexWiki(IndexRebuilder.java:310)[xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na]
    9. com.xpn.xwiki.plugin.lucene.IndexRebuilder.rebuildIndex(IndexRebuilder.java:265)[xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na]
    10. com.xpn.xwiki.plugin.lucene.IndexRebuilder.runInternal(IndexRebuilder.java:216)[xwiki-platform-search-lucene-4.1-20120523.214923-187.jar:na]
    11. com.xpn.xwiki.util.AbstractXWikiRunnable.run(AbstractXWikiRunnable.java:110)[xwiki-platform-legacy-oldcore-4.1-20120523.221259-159.jar:na]
    11 frames
  10. Java RT
    Thread.run
    1. java.lang.Thread.run(Thread.java:680)[na:1.6.0_31]
    1 frame