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https://issues.apache.org/jira/browse/VELOCITY-562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12521372
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nhb commented on VELOCITY-562:
------------------------------
They are using different templates and different context objects. There is,
however, one property object in the context of thread "http-8080-Processor23"
that is modified by thread "DataExchange" before and after the invocation of
Velocity there. It is not accessed by Velocity in that thread and it is not in
this context. So i don't think that this could be a problem.
Threre is no OutOfMemoryError. The "DataExchange" thread is working with huge
amounts of data. I wrote a NotificationListener using the MemoryMXBean. It got
notified that the heap will be running out of space soon, shortly before the
other thread starts parsing.
Thanks for that tip.
> Hanging in jj_scan_token (while holding lock for getResouce)
> ------------------------------------------------------------
>
> Key: VELOCITY-562
> URL: https://issues.apache.org/jira/browse/VELOCITY-562
> Project: Velocity
> Issue Type: Bug
> Affects Versions: 1.5
> Environment: Integreated in Tomcat on Ubuntu Linux
> JDK version: 1.5.0_08-b03
> Reporter: nhb
>
> We are having trouble with deadlocks in Velocity after updating from 1.3 to
> 1.5
> The thread holding the lock allways it at
> org.apache.velocity.runtime.parser.Parser.jj_scan_token(Parser.java:3259)
> although the frames below that differ between restarts. It is not possible to
> use Eclipse to step over that line. It simply hangs.
> 3259 is this line: "if (jj_la == 0 && jj_scanpos == jj_lastpos) throw jj_ls;"
> Here is an example stacktrace:
> Full thread dump Java HotSpot(TM) Client VM (1.5.0_08-b03 mixed mode):
> "DataExchange" daemon prio=1 tid=0x08b2df10 nid=0x2824 waiting for monitor
> entry [0x8545a000..0x8545b130]
> at
> org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:287)
> - waiting to lock <0x91140270> (a
> org.apache.velocity.runtime.resource.ResourceManagerImpl)
> at
> org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1102)
> at
> org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1077)
> at
> org.apache.velocity.runtime.RuntimeSingleton.getTemplate(RuntimeSingleton.java:303)
> at org.apache.velocity.app.Velocity.getTemplate(Velocity.java:503)
> at
> de.his.servlet.util.ServletUtil.parseWithVelocity(ServletUtil.java:735)
> [...]
> "http-8080-Processor23" daemon prio=1 tid=0x08220cc8 nid=0x2803 runnable
> [0x858e2000..0x858e3db0]
> at
> org.apache.velocity.runtime.parser.Parser.jj_scan_token(Parser.java:3259)
> at org.apache.velocity.runtime.parser.Parser.jj_3R_56(Parser.java:3089)
> at org.apache.velocity.runtime.parser.Parser.jj_3R_29(Parser.java:2696)
> at org.apache.velocity.runtime.parser.Parser.jj_3_8(Parser.java:2530)
> at org.apache.velocity.runtime.parser.Parser.jj_3_7(Parser.java:2574)
> at org.apache.velocity.runtime.parser.Parser.jj_2_7(Parser.java:2483)
> at org.apache.velocity.runtime.parser.Parser.Reference(Parser.java:1240)
> at
> org.apache.velocity.runtime.parser.Parser.PrimaryExpression(Parser.java:2391)
> at
> org.apache.velocity.runtime.parser.Parser.UnaryExpression(Parser.java:2366)
> at
> org.apache.velocity.runtime.parser.Parser.MultiplicativeExpression(Parser.java:2215)
> at
> org.apache.velocity.runtime.parser.Parser.AdditiveExpression(Parser.java:2139)
> at
> org.apache.velocity.runtime.parser.Parser.RelationalExpression(Parser.java:2007)
> at
> org.apache.velocity.runtime.parser.Parser.EqualityExpression(Parser.java:1931)
> at
> org.apache.velocity.runtime.parser.Parser.ConditionalAndExpression(Parser.java:1891)
> at
> org.apache.velocity.runtime.parser.Parser.ConditionalOrExpression(Parser.java:1851)
> at
> org.apache.velocity.runtime.parser.Parser.Expression(Parser.java:1798)
> at
> org.apache.velocity.runtime.parser.Parser.SetDirective(Parser.java:1730)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:310)
> at
> org.apache.velocity.runtime.parser.Parser.IfStatement(Parser.java:1453)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:293)
> at
> org.apache.velocity.runtime.parser.Parser.IfStatement(Parser.java:1453)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:293)
> at
> org.apache.velocity.runtime.parser.Parser.IfStatement(Parser.java:1453)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:293)
> at
> org.apache.velocity.runtime.parser.Parser.IfStatement(Parser.java:1453)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:293)
> at
> org.apache.velocity.runtime.parser.Parser.ElseStatement(Parser.java:1564)
> at
> org.apache.velocity.runtime.parser.Parser.IfStatement(Parser.java:1495)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:293)
> at org.apache.velocity.runtime.parser.Parser.process(Parser.java:258)
> at org.apache.velocity.runtime.parser.Parser.parse(Parser.java:105)
> at
> org.apache.velocity.runtime.RuntimeInstance.parse(RuntimeInstance.java:1042)
> at
> org.apache.velocity.runtime.RuntimeInstance.parse(RuntimeInstance.java:972)
> at org.apache.velocity.Template.process(Template.java:120)
> at
> org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource(ResourceManagerImpl.java:415)
> at
> org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:335)
> - locked <0x91140270> (a
> org.apache.velocity.runtime.resource.ResourceManagerImpl)
> at
> org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1102)
> at org.apache.velocity.runtime.directive.Parse.render(Parse.java:177)
> at
> org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:448)
> at
> org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
> at
> org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
> at org.apache.velocity.runtime.directive.Parse.render(Parse.java:224)
> at
> org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)
> at
> org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
> at org.apache.velocity.runtime.directive.Parse.render(Parse.java:224)
> at
> org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)
> at
> org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
> at org.apache.velocity.runtime.directive.Parse.render(Parse.java:224)
> at
> org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:448)
> at
> org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:448)
> at
> org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107)
> at
> org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
> at
> org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107)
> at
> org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
> at org.apache.velocity.Template.merge(Template.java:254)
> at
> de.his.servlet.util.ServletUtil.parseWithVelocity(ServletUtil.java:736)
> at
> de.his.servlet.util.ServletUtil.sendResponseWithVelocity(ServletUtil.java:684)
> at
> de.his.servlet.HISServletModuleImpl.handleRequest(HISServletModuleImpl.java:637)
> at
> de.his.servlet.RequestDispatcherServlet.invoke(RequestDispatcherServlet.java:908)
> at
> de.his.servlet.RequestDispatcherServlet.handleRequest(RequestDispatcherServlet.java:843)
> at
> de.his.servlet.RequestDispatcherServlet.doGet(RequestDispatcherServlet.java:1060)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
> 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:868)
> at
> org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
> at
> org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
> at
> org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
> at
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
> at java.lang.Thread.run(Thread.java:595)
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