Toolbar: NPE after a certain period of time due to quartz

I webt for a lunch and I let my browser opened and logued as root. After 30 minutes, I am getting such an error:

2009-01-13 12:56:54,218: WARN [org.jahia.resourcebundle.JahiaResourceBundle] - Resource [toolbar.itemgroups.page] not found in class java.util.PropertyResourceBundle using locale [fr]
2009-01-13 12:56:54,218: WARN [org.jahia.resourcebundle.JahiaResourceBundle] - Resource [toolbar.itemgroups.page] not found in class java.util.PropertyResourceBundle using locale [fr]
2009-01-13 12:56:54,218: WARN [org.jahia.resourcebundle.JahiaResourceBundle] - Resource [toolbar.itemgroups.page] not found in engine resource bundles using locale [fr]
2009-01-13 12:56:54,375: WARN [org.jahia.resourcebundle.JahiaResourceBundle] - Resource [toolbar.itemgroups.monitoring] not found in class java.util.PropertyResourceBundle using locale [fr]
2009-01-13 12:56:54,375: WARN [org.jahia.resourcebundle.JahiaResourceBundle] - Resource [toolbar.itemgroups.monitoring] not found in class java.util.PropertyResourceBundle using locale [fr]
2009-01-13 12:56:54,390: WARN [org.jahia.resourcebundle.JahiaResourceBundle] - Resource [toolbar.itemgroups.monitoring] not found in engine resource bundles using locale [fr]
[GC 435353K->340535K(621376K), 0.0355881 secs]
[GC 434679K->340223K(621184K), 0.0316154 secs]
[GC 434751K->340176K(621376K), 0.0337129 secs]
[GC 434704K->339672K(621184K), 0.0246343 secs]
[GC 434008K->339709K(614016K), 0.0169478 secs]
2009-01-13 13:25:00,046: ERROR [org.jahia.ajax.gwt.templates.components.toolbar.server.ToolbarServiceImpl] - Unable to get number of running job.
java.lang.NullPointerException
at org.jahia.ajax.gwt.templates.components.toolbar.server.ToolbarServiceImpl.updateGWTProcessJobInfo(ToolbarServiceImpl.java:622)
at org.jahia.ajax.gwt.templates.components.toolbar.server.ToolbarServiceImpl.updateGWTJahiaStateInfo(ToolbarServiceImpl.java:466)
at sun.reflect.GeneratedMethodAccessor642.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:164)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at org.jahia.ajax.gwt.commons.server.AbstractJahiaGWTServiceImpl.service(AbstractJahiaGWTServiceImpl.java:59)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.jahia.ajax.gwt.commons.server.AbstractJahiaGWTServiceImpl.service(AbstractJahiaGWTServiceImpl.java:65)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jahia.bin.filters.jcr.JcrSessionFilter.doFilter(JcrSessionFilter.java:23)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:164)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:141)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:90)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:417)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
2009-01-13 13:25:00,062: ERROR [org.jahia.ajax.gwt.templates.components.toolbar.server.ToolbarServiceImpl] - Error when triing to load Jahia state info due to
org.jahia.ajax.gwt.commons.client.rpc.GWTJahiaServiceException
at org.jahia.ajax.gwt.templates.components.toolbar.server.ToolbarServiceImpl.updateGWTProcessJobInfo(ToolbarServiceImpl.java:667)
at org.jahia.ajax.gwt.templates.components.toolbar.server.ToolbarServiceImpl.updateGWTJahiaStateInfo(ToolbarServiceImpl.java:466)
at sun.reflect.GeneratedMethodAccessor642.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:164)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at org.jahia.ajax.gwt.commons.server.AbstractJahiaGWTServiceImpl.service(AbstractJahiaGWTServiceImpl.java:59)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.jahia.ajax.gwt.commons.server.AbstractJahiaGWTServiceImpl.service(AbstractJahiaGWTServiceImpl.java:65)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jahia.bin.filters.jcr.JcrSessionFilter.doFilter(JcrSessionFilter.java:23)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:164)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:141)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:90)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:417)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
2009-01-13 13:25:41,656: INFO [org.jahia.services.search.lucene.fs.JahiaIndexSearcher] - Opening Searcher@1f486a5 main
2009-01-13 13:25:41,656: INFO [org.jahia.services.search.lucene.AbstractLuceneSearchIndexer] - Finished processing 8 indexing orders in 94ms.
2009-01-13 13:25:41,656: INFO [org.jahia.services.search.lucene.fs.JahiaIndexSearcher] - autowarming org.jahia.services.search.lucene.fs.JahiaIndexSearcher@1f486a5 from org.jahia.services.search.lucene.fs.JahiaIndexSearcher@c5b905
FilterCache

{cumulative_inserts=0, hits=0, cumulative_evictions=0, inserts=1, cumulative_lookups=0, lookups=0, cumulative_hitratio=0.00, cumulative_hits=0, hitratio=0.00, evictions=0, size=1}
2009-01-13 13:25:41,656: INFO [org.jahia.services.search.lucene.fs.JahiaIndexSearcher] - autowarming result for org.jahia.services.search.lucene.fs.JahiaIndexSearcher@1f486a5
FilterCache{cumulative_inserts=0, hits=0, cumulative_evictions=0, inserts=1, cumulative_lookups=0, lookups=0, cumulative_hitratio=0.00, cumulative_hits=0, hitratio=0.00, evictions=0, size=1}

2009-01-13 13:25:41,656: INFO [org.jahia.services.search.lucene.fs.LuceneCoreSearcher] - Registered new searcher org.jahia.services.search.lucene.fs.JahiaIndexSearcher@1f486a5
[GC 434045K->340145K(621056K), 0.0190636 secs]
[GC 433585K->339709K(612992K), 0.0258391 secs]