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Posted to dev@velocity.apache.org by "Stu Belden (JIRA)" <ji...@apache.org> on 2006/06/22 14:06:30 UTC
[jira] Updated: (VELOCITY-383) NPE when processing template under
heavy concurrent load
[ http://issues.apache.org/jira/browse/VELOCITY-383?page=all ]
Stu Belden updated VELOCITY-383:
--------------------------------
Attachment: Example.java
Proof of concept for the lack of thread safety in the Template class. This will work with the default velocity properties, and (probably) any velocity template. This POC is heavily inspired by the example "app_example1" that ships with the distribuition.
> NPE when processing template under heavy concurrent load
> --------------------------------------------------------
>
> Key: VELOCITY-383
> URL: http://issues.apache.org/jira/browse/VELOCITY-383
> Project: Velocity
> Type: Bug
> Components: Source
> Versions: 1.4
> Environment: Operating System: Windows XP
> Platform: PC
> Reporter: Hans
> Priority: Critical
> Attachments: Example.java
>
> During load testing the server, with 50 concurrent users, the
> VelocityViewServlet would throw a null pointer exception about 3% of the time.
> 97% of the time, the page would serve normally.
> Below is the trace:
> java.lang.NullPointerException
> at org.apache.velocity.runtime.parser.node.ASTDirective.init
> (ASTDirective.java:94)
> at org.apache.velocity.runtime.parser.node.SimpleNode.init
> (SimpleNode.java:201)
> at org.apache.velocity.Template.initDocument(Template.java:199)
> at org.apache.velocity.Template.process(Template.java:124)
> at
> org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource
> (ResourceManagerImpl.java:423)
> at org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource
> (ResourceManagerImpl.java:341)
> at org.apache.velocity.runtime.RuntimeInstance.getTemplate
> (RuntimeInstance.java:831)
> at org.apache.velocity.runtime.RuntimeInstance.getTemplate
> (RuntimeInstance.java:813)
> at org.apache.velocity.runtime.RuntimeSingleton.getTemplate
> (RuntimeSingleton.java:285)
> at
> org.apache.velocity.tools.view.servlet.VelocityViewServlet.getTemplate
> (VelocityViewServlet.java:540)
> at
> org.apache.velocity.tools.view.servlet.VelocityViewServlet.handleRequest
> (VelocityViewServlet.java:475)
> at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest
> (VelocityViewServlet.java:407)
> at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doPost
> (VelocityViewServlet.java:383)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
> (ApplicationFilterChain.java:237)
> at org.apache.catalina.core.ApplicationFilterChain.doFilter
> (ApplicationFilterChain.java:157)
> at org.apache.catalina.core.ApplicationDispatcher.invoke
> (ApplicationDispatcher.java:674)
> at org.apache.catalina.core.ApplicationDispatcher.doInclude
> (ApplicationDispatcher.java:576)
> at org.apache.catalina.core.ApplicationDispatcher.include
> (ApplicationDispatcher.java:501)
> at org.apache.velocity.tools.view.ImportSupport.acquireString
> (ImportSupport.java:140)
> at org.apache.velocity.tools.struts.TilesTool.doInsert
> (TilesTool.java:476)
> at org.apache.velocity.tools.struts.TilesTool.doInsert
> (TilesTool.java:419)
> at org.apache.velocity.tools.struts.TilesTool.processUrl
> (TilesTool.java:398)
> at org.apache.velocity.tools.struts.TilesTool.processAsDefinitionOrURL
> (TilesTool.java:357)
> at org.apache.velocity.tools.struts.TilesTool.processObjectValue
> (TilesTool.java:305)
> at org.apache.velocity.tools.struts.TilesTool.get(TilesTool.java:135)
> at sun.reflect.GeneratedMethodAccessor136.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at org.apache.velocity.runtime.parser.node.GetExecutor.execute
> (GetExecutor.java:65)
> at
> org.apache.velocity.util.introspection.UberspectImpl$VelGetterImpl.invoke
> (UberspectImpl.java:302)
> at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute
> (ASTIdentifier.java:157)
> at org.apache.velocity.runtime.parser.node.ASTReference.execute
> (ASTReference.java:175)
> at org.apache.velocity.runtime.parser.node.ASTReference.render
> (ASTReference.java:220)
> at org.apache.velocity.runtime.parser.node.SimpleNode.render
> (SimpleNode.java:230)
> at org.apache.velocity.Template.merge(Template.java:256)
> at
> org.apache.velocity.tools.view.servlet.VelocityViewServlet.mergeTemplate
> (VelocityViewServlet.java:592)
> at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest
> (VelocityViewServlet.java:417)
> at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doPost
> (VelocityViewServlet.java:383)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
> (ApplicationFilterChain.java:237)
> at org.apache.catalina.core.ApplicationFilterChain.doFilter
> (ApplicationFilterChain.java:157)
> at org.apache.catalina.core.ApplicationDispatcher.invoke
> (ApplicationDispatcher.java:674)
> at org.apache.catalina.core.ApplicationDispatcher.processRequest
> (ApplicationDispatcher.java:465)
> at org.apache.catalina.core.ApplicationDispatcher.doForward
> (ApplicationDispatcher.java:400)
> at org.apache.catalina.core.ApplicationDispatcher.forward
> (ApplicationDispatcher.java:303)
> at org.apache.struts.action.RequestProcessor.doForward
> (RequestProcessor.java:1063)
> at org.apache.struts.tiles.TilesRequestProcessor.doForward
> (TilesRequestProcessor.java:263)
> at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition
> (TilesRequestProcessor.java:239)
> at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig
> (TilesRequestProcessor.java:302)
> at org.apache.struts.action.RequestProcessor.process
> (RequestProcessor.java:229)
> at org.apache.struts.action.ActionServlet.process
> (ActionServlet.java:1194)
> at org.apache.struts.action.ActionServlet.doPost
> (ActionServlet.java:432)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
> (ApplicationFilterChain.java:237)
> at org.apache.catalina.core.ApplicationFilterChain.doFilter
> (ApplicationFilterChain.java:157)
> at org.apache.catalina.core.StandardWrapperValve.invoke
> (StandardWrapperValve.java:214)
> at org.apache.catalina.core.StandardContextValve.invoke
> (StandardContextValve.java:178)
> at org.apache.catalina.core.StandardHostValve.invoke
> (StandardHostValve.java:126)
> at org.apache.catalina.valves.ErrorReportValve.invoke
> (ErrorReportValve.java:105)
> at org.apache.catalina.core.StandardEngineValve.invoke
> (StandardEngineValve.java:107)
> at org.apache.catalina.connector.CoyoteAdapter.service
> (CoyoteAdapter.java:148)
> at org.apache.coyote.http11.Http11Processor.process
> (Http11Processor.java:825)
> at
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnecti
> on(Http11Protocol.java:731)
> at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket
> (PoolTcpEndpoint.java:526)
> at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt
> (LeaderFollowerWorkerThread.java:80)
> at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run
> (ThreadPool.java:684)
> at java.lang.Thread.run(Unknown Source)
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