Hi, I use xwiki 7.0.1 / tomcat-7.0.47 and I didn't manage to upgrade xwiki to xwiki 8.2.1. Then I tried to use java8/tomcat-8.5.4 to launch my current xwiki7.0.1 but I failed with these error message. To resume, with apache-tomcat-8.5.4 if I use java7, I can use Xwiki 7.0.1 but if I simply modify bin/catalina.sh with JAVA_HOME=/opt/jre1.8.0_102 xwiki crash with theses error :-( Any idea what is the problem? My tomcat launch only on xwiki (without other xwiki or application) and I launch tomcat with root account. Thxs for any help 9-Aug-2016 16:02:00.903 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 57469 ms 29-Aug-2016 16:02:26.239 SEVERE [https://xwiki-dev.dom.cp2i.i2/bin/view/Main/] org.apache.catalina.core.StandardWrapperValve.invoke "Servlet.service()" pour la servlet action a généré une exception java.lang.NullPointerException         at com.xpn.xwiki.web.Utils.getContextComponentManager(Utils.java:695)         at com.xpn.xwiki.web.Utils.getComponent(Utils.java:752)         at com.xpn.xwiki.web.Utils.getComponent(Utils.java:719) 2016-08-29 15:50:52,750 [Core extension repository updater] ERROR o.i.j.JmxUtil                  - ISPN000034: There's already an cache manager instance registered under 'org.xwiki.infinispan' JMX domain. If you want to allow multiple instances configured with same JMX domain enable 'allowDuplicateDomains' attribute in 'globalJmxStatistics' config element 29-Aug-2016 15:50:53.443 SEVERE [https://xwiki-dev.dom.cp2i.i2/bin/view/Main/] org.apache.catalina.core.StandardWrapperValve.invoke "Servlet.service()" pour la servlet action a généré une exception java.lang.NullPointerException         at com.xpn.xwiki.web.Utils.getContextComponentManager(Utils.java:695)         at com.xpn.xwiki.web.Utils.getComponent(Utils.java:752)         at com.xpn.xwiki.web.Utils.getComponent(Utils.java:719)         at com.xpn.xwiki.web.XWikiRequestProcessor.processPath(XWikiRequestProcessor.java:47)         at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:154)         at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)         at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)         at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)   <cut> 2016-08-29 15:50:54,182 [Core extension repository updater] ERROR o.i.j.JmxUtil                  - ISPN000034: There's already an cache manager instance registered under 'org.xwiki.infinispan' JMX domain. If you want to allow multiple instances configured with same JMX domain enable 'allowDuplicateDomains' attribute in 'globalJmxStatistics' config element