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https://issues.apache.org/jira/browse/SLING-1633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carsten Ziegeler closed SLING-1633.
-----------------------------------


> After unregistering a ResourceDecorator service any request causes a 
> NullPointerException to be thrown
> ------------------------------------------------------------------------------------------------------
>
>                 Key: SLING-1633
>                 URL: https://issues.apache.org/jira/browse/SLING-1633
>             Project: Sling
>          Issue Type: Bug
>          Components: JCR
>    Affects Versions: JCR Resource 2.0.6
>            Reporter: Davide Maestroni
>            Assignee: Felix Meschberger
>            Priority: Critical
>             Fix For: JCR Resource 2.0.8
>
>
> After registering and then unregistering a service implementing the 
> ResourceDecorator interface, any request causes a NullPointerException thus 
> making the whole repository unusable even if the HTTP response code is always 
> 200 (see trace below).
> 09.08.2010 12:23:15.109 *INFO* [127.0.0.1 [1281349395109] GET 
> /sling/content.json HTTP/1.1] logs/request.log 09/Aug/2010:12:23:15 +0200 [2] 
> <- 200 - 0ms
> 09.08.2010 12:23:15.109 *INFO* [127.0.0.1 [1281349395109] GET 
> /sling/content.json HTTP/1.1] logs/access.log 127.0.0.1 - admin 
> 09/Aug/2010:12:23:15 +0200 "GET /sling/content.json HTTP/1.1" 200 - "-" 
> "curl/7.19.5 (i586-pc-mingw32msvc) libcurl/7.19.5 zlib/1.2.3"
> 09.08.2010 12:23:15.109 *ERROR* [127.0.0.1 [1281349395109] GET 
> /sling/content.json HTTP/1.1] org.apache.sling.engine.impl.SlingMainServlet 
> service: Uncaught Problem handling the request java.lang.NullPointerException
>       at 
> org.apache.sling.engine.impl.SlingHttpServletRequestImpl.getResource(SlingHttpServletRequestImpl.java:107)
>       at 
> org.apache.sling.servlets.resolver.internal.SlingServletResolver.getErrorResource(SlingServletResolver.java:537)
>       at 
> org.apache.sling.servlets.resolver.internal.SlingServletResolver.handleError(SlingServletResolver.java:490)
>       at 
> org.apache.sling.engine.impl.SlingMainServlet.service(SlingMainServlet.java:363)
>       at 
> org.apache.sling.engine.impl.SlingMainServlet.service(SlingMainServlet.java:207)
>       at 
> org.apache.felix.http.base.internal.handler.ServletHandler.doHandle(ServletHandler.java:91)
>       at 
> org.apache.felix.http.base.internal.handler.ServletHandler.handle(ServletHandler.java:77)
>       at 
> org.apache.felix.http.base.internal.dispatch.ServletPipeline.handle(ServletPipeline.java:42)
>       at 
> org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:49)
>       at 
> org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
>       at 
> org.apache.felix.http.base.internal.dispatch.FilterPipeline.dispatch(FilterPipeline.java:48)
>       at 
> org.apache.felix.http.base.internal.dispatch.Dispatcher.dispatch(Dispatcher.java:39)
>       at 
> org.apache.felix.http.base.internal.DispatcherServlet.service(DispatcherServlet.java:55)
>       at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>       at 
> org.apache.felix.http.proxy.ProxyServlet.service(ProxyServlet.java:60)
>       at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>       at 
> org.apache.sling.launchpad.base.webapp.SlingServletDelegate.service(SlingServletDelegate.java:275)
>       at 
> org.apache.sling.launchpad.webapp.SlingServlet.service(SlingServlet.java:148)
>       at 
> org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:527)
>       at 
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:423)
>       at 
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
>       at 
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:456)
>       at 
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
>       at 
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:924)
>       at 
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:358)
>       at 
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
>       at 
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:860)
>       at 
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
>       at 
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:245)
>       at 
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
>       at 
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113)
>       at org.eclipse.jetty.server.Server.handle(Server.java:335)
>       at 
> org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:588)
>       at 
> org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:1029)
>       at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:549)
>       at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:211)
>       at 
> org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:418)
>       at 
> org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:489)
>       at 
> org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436)
>       at java.lang.Thread.run(Unknown Source)
> The issue seems to be solved just replacing line 110 of 
> bundles/jcr/resource/src/main/java/org/apache/sling/jcr/resource/internal/ResourceDecoratorTracker.java
>  with:
> ResourceDecorator[] decorators = EMPTY_ARRAY;

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