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https://issues.apache.org/jira/browse/QPID-7750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15972535#comment-15972535
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Rob Godfrey commented on QPID-7750:
-----------------------------------
So I think the core issue here is that requests on objects that are not opened
should probably result in some sort of error, rather than actually being
processed... however obviously the NPE should be fixed anyway
> [Java Broker] NPE in AbstractQueue#getOldestMessageArrivalTime when Queue was
> not opened
> ----------------------------------------------------------------------------------------
>
> Key: QPID-7750
> URL: https://issues.apache.org/jira/browse/QPID-7750
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: qpid-java-broker-7.0.0
> Reporter: Lorenz Quack
>
> There is a possibility of a NullPointerException in
> {{AbstractQueue#getOldestMessageArrivalTime}} when the queue has not been
> opened the entry list is {{null}}:
> {noformat}
> 2017-04-18 11:11:45,817 ERROR [HttpManagement-https-124]
> (o.a.q.s.m.p.f.ExceptionHandlingFilter) - Unexpected exception in servlet
> '/api/latest/virtualhost/default/default':
> java.lang.NullPointerException: null
> at
> org.apache.qpid.server.queue.AbstractQueue.getOldestMessageArrivalTime(AbstractQueue.java:1406)
> at
> org.apache.qpid.server.queue.AbstractQueue.getOldestMessageAge(AbstractQueue.java:1444)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.qpid.server.model.ConfiguredObjectMethodAttributeOrStatistic.getValue(ConfiguredObjectMethodAttributeOrStatistic.java:68)
> at
> org.apache.qpid.server.model.ConfiguredObjectMethodStatistic.getValue(ConfiguredObjectMethodStatistic.java:26)
> at
> org.apache.qpid.server.model.AbstractConfiguredObject.getStatistics(AbstractConfiguredObject.java:3159)
> at
> org.apache.qpid.server.queue.StandardQueueImplWithAccessChecking.getStatistics(StandardQueueImplWithAccessChecking.java:46)
> at
> org.apache.qpid.server.model.AbstractConfiguredObject.getStatistics(AbstractConfiguredObject.java:3146)
> at
> org.apache.qpid.server.management.plugin.servlet.rest.ConfiguredObjectToMapConverter.incorporateStatisticsIntoMap(ConfiguredObjectToMapConverter.java:218)
> at
> org.apache.qpid.server.management.plugin.servlet.rest.ConfiguredObjectToMapConverter.convertObjectToMap(ConfiguredObjectToMapConverter.java:65)
> at
> org.apache.qpid.server.management.plugin.servlet.rest.ConfiguredObjectToMapConverter.incorporateChildrenIntoMap(ConfiguredObjectToMapConverter.java:271)
> at
> org.apache.qpid.server.management.plugin.servlet.rest.ConfiguredObjectToMapConverter.convertObjectToMap(ConfiguredObjectToMapConverter.java:69)
> at
> org.apache.qpid.server.management.plugin.servlet.rest.RestServlet.doGet(RestServlet.java:303)
> at
> org.apache.qpid.server.management.plugin.servlet.rest.AbstractServlet.doGet(AbstractServlet.java:123)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:575)
> at
> org.apache.qpid.server.management.plugin.servlet.rest.RestServlet.service(RestServlet.java:396)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
> at
> org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1496)
> at
> org.apache.qpid.server.management.plugin.filter.AuthenticationCheckFilter$1.run(AuthenticationCheckFilter.java:157)
> at
> org.apache.qpid.server.management.plugin.filter.AuthenticationCheckFilter$1.run(AuthenticationCheckFilter.java:153)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.qpid.server.management.plugin.filter.AuthenticationCheckFilter.doFilterChainAs(AuthenticationCheckFilter.java:152)
> at
> org.apache.qpid.server.management.plugin.filter.AuthenticationCheckFilter.doFilter(AuthenticationCheckFilter.java:122)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
> at
> org.apache.qpid.server.management.plugin.filter.LoggingFilter.doFilter(LoggingFilter.java:63)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
> at
> org.apache.qpid.server.management.plugin.filter.ForbiddingTraceFilter.doFilter(ForbiddingTraceFilter.java:65)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
> at
> org.eclipse.jetty.servlets.CrossOriginFilter.handle(CrossOriginFilter.java:247)
> at
> org.eclipse.jetty.servlets.CrossOriginFilter.doFilter(CrossOriginFilter.java:210)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
> at
> org.apache.qpid.server.management.plugin.filter.ExceptionHandlingFilter.doFilter(ExceptionHandlingFilter.java:59)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:229)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
> at org.eclipse.jetty.server.Server.handle(Server.java:370)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
> at
> org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
> at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
> at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
> at
> org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
> at org.eclipse.jetty.io.nio.SslConnection.handle(SslConnection.java:196)
> at
> org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
> at
> org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> I'm not entirely sure what the events were leading up to the error. It might
> be a race between the broker starting up / shutting down and a browser making
> a request.
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