Hi there,
The graphs under Server > Statistics are not being generated. Every place you should see a graph (png image), there is a broken page icon.
Under Server > Statistics > All Reports any of the PDF download links like:
https://$SERVERNAME:9091/plugins/monitoring/graph?stat=sessions&timeperiod=last60minutes&pdf=all
Yields server error:
HTTP ERROR 500
Problem accessing /plugins/monitoring/graph. Reason:
Server Error
Caused by:
java.lang.NoClassDefFoundError: Could not initialize class org.jfree.chart.JFreeChart
at org.jivesoftware.openfire.reporting.graph.GraphEngine.createChart(GraphEngine.java:309)
at org.jivesoftware.openfire.reporting.graph.GraphEngine.createChart(GraphEngine.java:305)
at org.jivesoftware.openfire.reporting.graph.GraphEngine.createTimeBarChart(GraphEngine.java:277)
at org.jivesoftware.openfire.reporting.graph.GraphEngine.generateChart(GraphEngine.java:125)
at org.jivesoftware.openfire.reporting.graph.GraphServlet.service(GraphServlet.java:111)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.jivesoftware.openfire.container.PluginServlet.handleServlet(PluginServlet.java:404)
at org.jivesoftware.openfire.container.PluginServlet.service(PluginServlet.java:101)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:226)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:215)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:499)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
at java.lang.Thread.run(Thread.java:748)
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This has been a problem for a long time, through many upgrades and reinstalls.
Debian 9 Stretch (Stable) ; openjdk-8-jre-headless:amd64
If there is anything else that you need to help let me know and I will get it to you.
Thanks!