Hi all
I've got the following stack trace in my Geoserver logs:
2015-01-16 09:57:53,591 ERROR [geoserver.ows] -
org.geoserver.platform.ServiceException: Can't obtain the schema for the 
required layer.
                             at 
org.geoserver.wms.legendgraphic.GetLegendGraphicKvpReader.read(GetLegendGraphicKvpReader.java:160)
                             at 
org.geoserver.wms.legendgraphic.GetLegendGraphicKvpReader.read(GetLegendGraphicKvpReader.java:61)
                             at 
org.geoserver.ows.Dispatcher.parseRequestKVP(Dispatcher.java:1412)
                             at 
org.geoserver.ows.Dispatcher.dispatch(Dispatcher.java:622)
                             at 
org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:263)
                             at 
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
                             at 
org.geoserver.gwc.GWC.proxyOwsRequest(GWC.java:1188)
                             at 
org.geoserver.gwc.layer.GeoServerTileLayer.proxyRequest(GeoServerTileLayer.java:1117)
                             at 
org.geowebcache.service.wms.WMSService.handleRequest(WMSService.java:277)
                             at 
org.geowebcache.service.wms.WMSService$$FastClassByCGLIB$$85c0e55b.invoke(<generated>)
                             at 
net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
                             at 
org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689)
                             at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
                             at 
org.geoserver.gwc.config.GWCServiceEnablementInterceptor.invoke(GWCServiceEnablementInterceptor.java:46)
                             at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
                             at 
org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
                             at 
org.geowebcache.service.wms.WMSService$$EnhancerByCGLIB$$8fb5ec75.handleRequest(<generated>)
                             at 
org.geowebcache.GeoWebCacheDispatcher.handleServiceRequest(GeoWebCacheDispatcher.java:344)
                             at 
org.geowebcache.GeoWebCacheDispatcher.handleRequestInternal(GeoWebCacheDispatcher.java:254)
                             at 
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
                             at 
org.geoserver.gwc.dispatch.GwcServiceProxy.dispatch(GwcServiceProxy.java:97)
                             at 
sun.reflect.GeneratedMethodAccessor165.invoke(Unknown Source)
                             at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
                             at java.lang.reflect.Method.invoke(Unknown Source)
                             at 
org.geoserver.ows.Dispatcher.execute(Dispatcher.java:774)
                             at 
org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:272)
                             at 
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
                             at 
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
                             at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
                             at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
                             at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
                             at 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
                             at 
javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
                             at 
javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
                             at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
                             at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
                             at 
org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:27)
                             at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
                             at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:74)
                             at 
org.geoserver.wms.animate.AnimatorFilter.doFilter(AnimatorFilter.java:70)
                             at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:70)
                             at 
org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:45)
                             at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
                             at 
org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:49)
                             at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
                             at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
                             at 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)
                             at 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
                             at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
                             at 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
                             at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
                             at 
org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:53)
                             at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
                             at 
org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
                             at 
org.geoserver.security.filter.GeoServerBasicAuthenticationFilter.doFilter(GeoServerBasicAuthenticationFilter.java:82)
                             at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
                             at 
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
                             at 
org.geoserver.security.filter.GeoServerSecurityContextPersistenceFilter$1.doFilter(GeoServerSecurityContextPersistenceFilter.java:52)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
                             at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
                             at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
                             at 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)
                             at 
org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:134)
                             at 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
                             at 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
                             at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
                             at 
org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:75)
                             at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
                             at 
org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:42)
                             at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
                             at 
org.geoserver.filters.SessionDebugFilter.doFilter(SessionDebugFilter.java:47)
                             at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
                             at 
org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:43)
                             at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
                             at 
org.vfny.geoserver.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:109)
                             at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
                             at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
                             at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
                             at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
                             at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
                             at 
org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
                             at 
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
                             at 
org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
                             at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
                             at org.mortbay.jetty.Server.handle(Server.java:324)
                             at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
                             at 
org.mortbay.jetty.ajp.Ajp13Connection.access$2700(Ajp13Connection.java:44)
                             at 
org.mortbay.jetty.ajp.Ajp13Connection$RequestHandler.headerComplete(Ajp13Connection.java:225)
                             at 
org.mortbay.jetty.ajp.Ajp13Parser.parseNext(Ajp13Parser.java:474)
                             at 
org.mortbay.jetty.ajp.Ajp13Parser.parseAvailable(Ajp13Parser.java:142)
                             at 
org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
                             at 
org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
                             at 
org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
Caused by: org.geoserver.platform.ServiceException: Cannot get FeatureType for 
Layer
                             at 
org.geoserver.wms.legendgraphic.GetLegendGraphicKvpReader.addLayer(GetLegendGraphicKvpReader.java:219)
                             at 
org.geoserver.wms.legendgraphic.GetLegendGraphicKvpReader.read(GetLegendGraphicKvpReader.java:139)
                             ... 102 more

No entry with the same time in request.log. How can I find out what layer that 
caused this?

Regards
Anders Erlandsson
Sundsvalls kommun
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