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Posted to dev@qpid.apache.org by "Keith Wall (JIRA)" <ji...@apache.org> on 2014/05/26 17:48:01 UTC
[jira] [Created] (QPID-5787) Management can observe a child object
before its constructor has completed
Keith Wall created QPID-5787:
--------------------------------
Summary: Management can observe a child object before its constructor has completed
Key: QPID-5787
URL: https://issues.apache.org/jira/browse/QPID-5787
Project: Qpid
Issue Type: Bug
Components: Java Broker
Affects Versions: 0.29
Reporter: Keith Wall
Assignee: Rob Godfrey
Currently new ConfiguredObjects register themselves within their parent within the constructor (ACO constructor's invocation of registerChild - line 243).
This allows *this* to escape before the object has completed its constructor. A client calling parent.getChildren is able to see partly constructed children (DEFECT).
This problem is revealed by a sporadic test failure - BDBHAVirtualHostNodeRestTest. The REST API tries to query virtual host node whose child is still undergoing construction. This leads to a NPE in the Broker logs and a 500 back to the http agent.
In this case, the VH's statistics fields are final and initialised once during AVH's constructor.
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Broker-Configuration-Thread 2014-05-26 11:04:05,038 INFO [qpid.server.stats.StatisticsCounter] Resetting statistics for counter: bytes-received-BDBHAVirtualHostNodeRestTest.testNewMasterElectedWhenVirtualHostIsStopped-28
qtp1754689051-872 2014-05-26 11:04:05,039 WARN [eclipse.jetty.servlet.ServletHandler] /api/latest/virtualhostnode/node3
java.lang.NullPointerException
at org.apache.qpid.server.virtualhost.AbstractVirtualHost.getBytesIn(AbstractVirtualHost.java:1175)
at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.qpid.server.model.ConfiguredObjectAttributeOrStatistic.getValue(ConfiguredObjectAttributeOrStatistic.java:138)
at org.apache.qpid.server.model.AbstractConfiguredObject.getStatistics(AbstractConfiguredObject.java:1296)
at org.apache.qpid.server.management.plugin.servlet.rest.ConfiguredObjectToMapConverter.incorporateStatisticsIntoMap(ConfiguredObjectToMapConverter.java:89)
at org.apache.qpid.server.management.plugin.servlet.rest.ConfiguredObjectToMapConverter.convertObjectToMap(ConfiguredObjectToMapConverter.java:42)
at org.apache.qpid.server.management.plugin.servlet.rest.ConfiguredObjectToMapConverter.incorporateChildrenIntoMap(ConfiguredObjectToMapConverter.java:112)
at org.apache.qpid.server.management.plugin.servlet.rest.ConfiguredObjectToMapConverter.convertObjectToMap(ConfiguredObjectToMapConverter.java:46)
at org.apache.qpid.server.management.plugin.servlet.rest.RestServlet.doGetWithSubjectAndActor(RestServlet.java:318)
at org.apache.qpid.server.management.plugin.servlet.rest.AbstractServlet$1.run(AbstractServlet.java:76)
at org.apache.qpid.server.management.plugin.servlet.rest.AbstractServlet$1.run(AbstractServlet.java:72)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.qpid.server.management.plugin.servlet.rest.AbstractServlet.doWithSubjectAndActor(AbstractServlet.java:195)
at org.apache.qpid.server.management.plugin.servlet.rest.AbstractServlet.doGet(AbstractServlet.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:575)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1496)
at org.apache.qpid.server.management.plugin.filter.ForbiddingAuthorisationFilter.doFilter(ForbiddingAuthorisationFilter.java:90)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:229)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
at org.eclipse.jetty.server.AbstractHttpConnection$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.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
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:744)
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