Disabled antialias and not default style generate null pointer exception
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                 Key: GEOS-3447
                 URL: http://jira.codehaus.org/browse/GEOS-3447
             Project: GeoServer
          Issue Type: Bug
    Affects Versions: 2.0-RC1
         Environment: Linux
java version "1.6.0_15"
Java(TM) SE Runtime Environment (build 1.6.0_15-b03)
Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02, mixed mode)
            Reporter: Ľubomír Varga
            Assignee: Andrea Aime
            Priority: Minor


After fresh download and install of geoserver 2.0-RC1 I go thru login -> layer 
preview -> select "topp:states" -> shows open layers properties -> select tiled 
version -> select no antialiasing -> select styles: pophatch -> this generate 
error.

In log I see this exception:
15 Sep 16:50:08 ERROR [geoserver.ows] -
org.vfny.geoserver.wms.WmsException: java.lang.NullPointerException
        at 
org.vfny.geoserver.wms.responses.GetMapResponse.execute(GetMapResponse.java:442)
        at 
org.geoserver.ows.adapters.ResponseAdapter.getMimeType(ResponseAdapter.java:48)
        at org.geoserver.ows.Dispatcher.response(Dispatcher.java:690)
        at 
org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:216)
        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:875)
        at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:809)
        at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
        at 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501)
        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$CachedChain.doFilter(ServletHandler.java:1093)
        at 
org.vfny.geoserver.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265)
        at 
org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)
        at 
org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)
        at 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        at 
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:124)
        at 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        at 
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
        at 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        at 
org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:174)
        at 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        at 
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
        at 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        at 
org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:149)
        at 
org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:98)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:73)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at 
org.geoserver.filters.ReverseProxyFilter.doFilter(ReverseProxyFilter.java:183)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:41)
        at 
org.mortbay.jetty.servlet.ServletHandler$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: java.lang.NullPointerException
        at 
org.vfny.geoserver.wms.responses.PaletteExtractor.handleOpacity(PaletteExtractor.java:150)
        at 
org.vfny.geoserver.wms.responses.PaletteExtractor.visit(PaletteExtractor.java:381)
        at org.geotools.styling.GraphicImpl.accept(GraphicImpl.java:359)
        at 
org.vfny.geoserver.wms.responses.PaletteExtractor.visit(PaletteExtractor.java:289)
        at org.geotools.styling.FillImpl.accept(FillImpl.java:199)
        at 
org.vfny.geoserver.wms.responses.PaletteExtractor.visit(PaletteExtractor.java:346)
        at 
org.geotools.styling.PolygonSymbolizerImpl.accept(PolygonSymbolizerImpl.java:192)
        at 
org.vfny.geoserver.wms.responses.PaletteExtractor.visit(PaletteExtractor.java:202)
        at org.geotools.styling.RuleImpl.accept(RuleImpl.java:305)
        at 
org.vfny.geoserver.wms.responses.PaletteExtractor.visit(PaletteExtractor.java:215)
        at 
org.geotools.styling.FeatureTypeStyleImpl.accept(FeatureTypeStyleImpl.java:232)
        at 
org.vfny.geoserver.wms.responses.PaletteExtractor.visit(PaletteExtractor.java:183)
        at 
org.vfny.geoserver.wms.responses.DefaultRasterMapProducer.produceMap(DefaultRasterMapProducer.java:223)
        at 
org.vfny.geoserver.wms.responses.map.metatile.MetatileMapProducer.produceMap(MetatileMapProducer.java:122)
        at 
org.vfny.geoserver.wms.responses.GetMapResponse.execute(GetMapResponse.java:421)
        ... 52 more

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