i believe what i'm seeing is explained by

  https://osgeo-org.atlassian.net/browse/GEOS-7216


On Wed, 28 Sep 2016 12:32:57 +1000, Raif S. Naffah wrote:

> hi all,
> 
> working w/ GeoServer 2.8.5 i'm getting sporadic failures when
> requesting WFS capabilities.  the failures show up in the
> geoserver.log as follows:
> 
> 2016-09-28 12:02:18,843 INFO [org.geoserver.wfs] - 
> Request: getServiceInfo
> 2016-09-28 12:02:18,844 INFO [org.geoserver.wfs] - 
> Request: getCapabilities
>     baseUrl = http://localhost:9100/geoserver/
>     service = WFS
> 2016-09-28 12:02:18,879 ERROR [org.geoserver.ows] - 
> java.io.IOException
>       at
> org.geoserver.wfs.response.GetCapabilitiesResponse.write(GetCapabilitiesResponse.java:63)
> at org.geoserver.ows.Dispatcher.response(Dispatcher.java:996) at
> org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:279)
> 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$CachedChain.doFilter(ServletHandler.java:1093)
> at
> org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:28)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:75)
> at
> org.geoserver.wms.animate.AnimatorFilter.doFilter(AnimatorFilter.java:71)
> at
> org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:71)
> at
> org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:46)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:50)
> at
> org.mortbay.jetty.servlet.ServletHandler$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:69)
> 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$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:73)
> at
> org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:92)
> at
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
> at
> org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:69)
> at
> org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
> at
> org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:73)
> at
> org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:92)
> at
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
> at
> org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:54)
> at
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
> at
> org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:69)
> at
> org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
> at
> org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:73)
> at
> org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:92)
> at
> org.geoserver.security.filter.GeoServerBasicAuthenticationFilter.doFilter(GeoServerBasicAuthenticationFilter.java:83)
> at
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
> at
> org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:69)
> at
> org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
> at
> org.geoserver.security.filter.GeoServerSecurityContextPersistenceFilter$1.doFilter(GeoServerSecurityContextPersistenceFilter.java:53)
> at
> org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:73)
> at
> org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:92)
> at
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
> at
> org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)
> at
> org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:135)
> at
> org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
> at
> org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:87)
> 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:48)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:44)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
> at
> org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
> at
> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
> at
> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
> at
> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
> at org.mortbay.jetty.Server.handle(Server.java:324) at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514) at
> org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211) at
> org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380) at
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
> at
> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
> Caused by: javax.xml.transform.TransformerException:
> java.lang.NullPointerException at
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:746)
> at
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:351)
> at
> org.geotools.xml.transform.TransformerBase$Task.run(TransformerBase.java:300)
> at
> org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:133)
> at
> org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:112)
> at
> org.geoserver.wfs.response.GetCapabilitiesResponse.write(GetCapabilitiesResponse.java:61)
>  ...
> 79 more Caused by: java.lang.NullPointerException at
> org.geoserver.wfs.CapabilitiesTransformer$WFS1_1$CapabilitiesTranslator1_1.featureType(CapabilitiesTransformer.java:1572)
> at
> org.geoserver.wfs.CapabilitiesTransformer$WFS1_1$CapabilitiesTranslator1_1.featureTypes(CapabilitiesTransformer.java:1421)
> at
> org.geoserver.wfs.CapabilitiesTransformer$WFS2_0$CapabilitiesTranslator2_0.featureTypeList(CapabilitiesTransformer.java:2273)
> at
> org.geoserver.wfs.CapabilitiesTransformer$WFS2_0$CapabilitiesTranslator2_0.encode(CapabilitiesTransformer.java:2024)
> at
> org.geotools.xml.transform.TransformerBase$XMLReaderSupport.parse(TransformerBase.java:1026)
> at
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:668)
> at
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:737)
>  ...
> 84 more looking at the source of the CapabilitiesTransformer near
> line #1572 i see:
> 
> 
>                 Envelope bbox = null;
>                 bbox = featureType.getLatLonBoundingBox();
> 
>                 start("ows:WGS84BoundingBox");
> 
>                 element("ows:LowerCorner", bbox.getMinX() + " " +
> bbox.getMinY()); element("ows:UpperCorner", bbox.getMaxX() + " " +
> bbox.getMaxY());
> 
>                 end("ows:WGS84BoundingBox");
>                 
> 1/ any ideas why bbox is sometimes null?
> 
> 2/ does it make sense to check for null before emitting this element?
-- 
cheers;
rsn

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