Hi all,

I have a problem with opening Geofence Data Rules and Admin Rules pages from 
the Geoserver Web UI (stack trace below). Additionally, I'm getting 
NullPointerException if I press the Test Connection -button  on the GeoFence 
Admin Page.
Geoserver 2.18.0 is running on Ubuntu 18.04.5 LTS  with JVM Version (Ubuntu: 
11.0.8 (OpenJDK 64-Bit Server VM).
I have installed the latest geofence and geofence-server plugins.
Can someone help me to get past this?
Here's the stack trace:

org.apache.wicket.WicketRuntimeException: Can't instantiate page using 
constructor 'public org.geoserver.geofence.web.GeofenceServerAdminPage()'. An 
exception has been thrown during construction!
              at 
org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:194)
              at 
org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:67)
              at 
org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:103)
              at 
org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:106)
              at 
org.apache.wicket.core.request.handler.PageProvider.resolvePageInstance(PageProvider.java:271)
              at 
org.apache.wicket.core.request.handler.PageProvider.getPageInstance(PageProvider.java:169)
              at 
org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
              at 
org.apache.wicket.request.handler.render.WebPageRenderer.isPageStateless(WebPageRenderer.java:287)
              at 
org.apache.wicket.request.handler.render.WebPageRenderer.shouldRenderPageAndWriteResponse(WebPageRenderer.java:329)
              at 
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:193)
              at 
org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175)
              at 
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:895)
              at 
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
              at 
org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265)
              at 
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222)
              at 
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
              at 
org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)
              at 
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
              at 
org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:137)
              at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
              at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
              at 
org.springframework.web.servlet.mvc.ServletWrappingController.handleRequestInternal(ServletWrappingController.java:166)
              at 
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177)
              at 
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:52)
              at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
              at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
              at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
              at 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
              at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
              at 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
              at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:26)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:69)
              at 
org.geoserver.wms.animate.AnimatorFilter.doFilter(AnimatorFilter.java:70)
              at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
              at 
org.geoserver.monitor.MonitorFilter.doFilter(MonitorFilter.java:88)
              at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
              at 
org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:41)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:37)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
              at 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
              at 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
              at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
              at 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
              at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
              at 
org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:51)
              at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
              at 
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
              at 
org.geoserver.security.filter.GeoServerUserNamePasswordAuthenticationFilter.doFilter(GeoServerUserNamePasswordAuthenticationFilter.java:122)
              at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
              at 
org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:158)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
              at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
              at 
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
              at 
org.geoserver.security.filter.GeoServerSecurityContextPersistenceFilter$1.doFilter(GeoServerSecurityContextPersistenceFilter.java:52)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
              at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
              at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
              at 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
              at 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
              at 
org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:142)
              at 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
              at 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:101)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.geoserver.filters.XFrameOptionsFilter.doFilter(XFrameOptionsFilter.java:77)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:47)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.geoserver.filters.SessionDebugFilter.doFilter(SessionDebugFilter.java:46)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:42)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
              at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
              at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
              at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
              at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
              at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
              at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
              at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
              at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
              at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
              at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
              at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
              at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
              at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
              at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
              at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
              at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
              at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
              at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
              at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
              at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.reflect.InvocationTargetException
              at 
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native
 Method)
              at 
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
              at 
java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
              at 
java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
              at 
org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:175)
              ... 123 more
Caused by: java.lang.NullPointerException
              at 
org.hibernate.impl.SessionFactoryImpl.getClassMetadata(SessionFactoryImpl.java:807)
              at 
com.googlecode.genericdao.search.hibernate.HibernateMetadataUtil.get(HibernateMetadataUtil.java:92)
              at 
com.googlecode.genericdao.dao.jpa.JPABaseDAO._all(JPABaseDAO.java:206)
              at 
com.googlecode.genericdao.dao.jpa.GenericDAOImpl.findAll(GenericDAOImpl.java:61)
              at 
org.geoserver.geofence.core.dao.impl.AdminRuleDAOImpl.findAll(AdminRuleDAOImpl.java:93)
              at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
              at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
              at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
              at java.base/java.lang.reflect.Method.invoke(Method.java:566)
              at 
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)
              at 
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
              at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
              at 
org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:295)
              at 
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
              at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
              at 
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
              at com.sun.proxy.$Proxy40.findAll(Unknown Source)
              at 
org.geoserver.geofence.services.AdminRuleAdminServiceImpl.getAll(AdminRuleAdminServiceImpl.java:154)
              at 
org.geoserver.geofence.web.GeofenceAdminRulesModel.<init>(GeofenceAdminRulesModel.java:73)
              at 
org.geoserver.geofence.web.GeofenceServerAdminPage.<init>(GeofenceServerAdminPage.java:62)
              ... 128 more

BR,
Eetu Jutila

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