Dear Geoserver users,

A while ago we had to restart our Geoserver instance (version 2.14.0) and since 
then I get the following error when trying to view the groups:

org.apache.wicket.WicketRuntimeException: Can't instantiate page using 
constructor 'public org.geoserver.web.data.layergroup.LayerGroupPage()'. 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.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:102)
        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:622)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at 
org.springframework.web.servlet.mvc.ServletWrappingController.handleRequestInternal(ServletWrappingController.java:157)
        at 
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:174)
        at 
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:50)
        at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
        at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
        at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
        at 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
        at 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:26)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:69)
        at 
org.geoserver.wms.animate.AnimatorFilter.doFilter(AnimatorFilter.java:73)
        at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
        at 
org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:41)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:37)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
        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$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
        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:331)
        at 
org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:51)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
        at 
org.geoserver.security.filter.GeoServerUserNamePasswordAuthenticationFilter.doFilter(GeoServerUserNamePasswordAuthenticationFilter.java:112)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        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$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$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:331)
        at 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
        at 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
        at 
org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:141)
        at 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:347)
        at 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:263)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:90)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.filters.XFrameOptionsFilter.doFilter(XFrameOptionsFilter.java:79)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:42)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.filters.SessionDebugFilter.doFilter(SessionDebugFilter.java:46)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:42)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
        at 
org.apache.coyote.ajp.AbstractAjpProcessor.process(AbstractAjpProcessor.java:868)
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at 
org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:175)
        ... 119 more
Caused by: java.lang.NullPointerException

When trying to view the groups I see the following in the log:

2019-02-14 07:05:27,813 ERROR [geoserver.ows] -
org.geoserver.platform.ServiceException: 
javax.xml.transform.TransformerException: java.lang.RuntimeException: Can't 
obtain Envelope of Layer-Groups: null
        at 
org.geoserver.wms.capabilities.GetCapabilitiesResponse.write(GetCapabilitiesResponse.java:110)
        at org.geoserver.ows.Dispatcher.response(Dispatcher.java:1032)
        at 
org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:268)
        at 
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:174)
        at 
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:50)
        at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
        at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
        at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
        at 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
        at 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:26)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:69)
        at 
org.geoserver.wms.animate.AnimatorFilter.doFilter(AnimatorFilter.java:73)
        at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
        at 
org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:41)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:37)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$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:331)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:51)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:215)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
        at 
org.geoserver.security.filter.GeoServerBasicAuthenticationFilter.doFilter(GeoServerBasicAuthenticationFilter.java:81)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$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:331)
        at 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
        at 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
        at 
org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:141)
        at 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:347)
        at 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:263)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:90)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.filters.XFrameOptionsFilter.doFilter(XFrameOptionsFilter.java:79)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:42)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.filters.SessionDebugFilter.doFilter(SessionDebugFilter.java:46)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:42)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
        at 
org.apache.coyote.ajp.AbstractAjpProcessor.process(AbstractAjpProcessor.java:868)
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
Caused by: javax.xml.transform.TransformerException: 
java.lang.RuntimeException: Can't obtain Envelope of Layer-Groups: null
        at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:737)
        at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:343)
        at 
org.geotools.xml.transform.TransformerBase$Task.run(TransformerBase.java:284)
        at 
org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:119)
        at 
org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:101)
        at 
org.geoserver.wms.capabilities.GetCapabilitiesResponse.write(GetCapabilitiesResponse.java:108)
        ... 97 more
Caused by: java.lang.RuntimeException: Can't obtain Envelope of Layer-Groups: 
null
        at 
org.geoserver.wms.capabilities.GetCapabilitiesTransformer$CapabilitiesTranslator.handleLayers(GetCapabilitiesTransformer.java:715)
        at 
org.geoserver.wms.capabilities.GetCapabilitiesTransformer$CapabilitiesTranslator.handleCapability(GetCapabilitiesTransformer.java:472)
        at 
org.geoserver.wms.capabilities.GetCapabilitiesTransformer$CapabilitiesTranslator.encode(GetCapabilitiesTransformer.java:310)
        at 
org.geotools.xml.transform.TransformerBase$XMLReaderSupport.parse(TransformerBase.java:996)
        at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:659)
        at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:728)
        ... 102 more
Caused by: java.lang.NullPointerException



I have reloaded the configuration and catalagus, but still no joy.

If I understand it correctly Geoserver cannot obtain the bounding box of the 
group layers, but how can I change that?

I have removed the group layers and group sources, but the error still remains.

If anybody can help me out and pointing to a solution, it will be most welcome.

Met vriendelijke groet,

Itay Bar-On
Geo Informatie Specialist
[Gemeente Vlaardingen]

Informatie en Facilitaire Voorzieningen
Westnieuwland 6, 3131VX Vlaardingen, Nederland
T   06 10173309
E  [email protected]
W  www.vlaardingen.nl

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http://geoserver.org/comm/userlist-guidelines.html

If you want to request a feature or an improvement, also see this: 
https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer


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