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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 edited comment on VELOCITY-562 at 8/21/07 2:35 AM:
-------------------------------------------------------
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. But 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.
was (Author: nhb):
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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