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

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javax.management.InstanceAlreadyExistsException: org.xwiki:type=Velocity,domain=Engines,name=default
at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312)
at org.xwiki.management.internal.DefaultJMXBeanRegistration.registerMBean(DefaultJMXBeanRegistration.java:62)
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.(AbstractDocumentData.java:109)
at com.xpn.xwiki.plugin.lucene.DocumentData.(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)

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