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Posted to dev@velocity.apache.org by "Dominik Stadler (JIRA)" <de...@velocity.apache.org> on 2010/08/27 09:58:53 UTC
[jira] Created: (VELOCITY-775) Hanging in jj_scan_token
Hanging in jj_scan_token
------------------------
Key: VELOCITY-775
URL: https://issues.apache.org/jira/browse/VELOCITY-775
Project: Velocity
Issue Type: Bug
Components: Engine
Environment: Velocity 1.6.3
Reporter: Dominik Stadler
I have the same issue as reported in VELOCITY-562, velocity hangs in method Parser.jj_scan_token(). I can reproduce it by running heavy load on my application for a few hours.
Currently running 1.6.3, I looked at the issues fixed in 1.6.4, VELOCITY-718 seems not related, but I will now upgrade to 1.6.4 and see if the same happens again.
The application is using velocity in up to 3 threads simultaneously, nothing is shared between threads, relevant stack traces from a thread dump are as follows, one thread is currently not inside velocity at all:
"1334671070@qtp-2060763463-85" prio=6 tid=0x00000000181c5800 nid=0x6004 runnable [0x00000000110dd000]
java.lang.Thread.State: RUNNABLE
at org.apache.velocity.runtime.parser.Parser.jj_scan_token(Parser.java:3340)
at org.apache.velocity.runtime.parser.Parser.jj_3R_56(Parser.java:2768)
at org.apache.velocity.runtime.parser.Parser.jj_3R_29(Parser.java:3000)
at org.apache.velocity.runtime.parser.Parser.jj_3_8(Parser.java:2834)
at org.apache.velocity.runtime.parser.Parser.jj_3_7(Parser.java:2878)
at org.apache.velocity.runtime.parser.Parser.jj_2_7(Parser.java:2560)
at org.apache.velocity.runtime.parser.Parser.Reference(Parser.java:1317)
at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:354)
at org.apache.velocity.runtime.parser.Parser.IfStatement(Parser.java:1530)
at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:346)
at org.apache.velocity.runtime.parser.Parser.Directive(Parser.java:888)
at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:373)
at org.apache.velocity.runtime.parser.Parser.process(Parser.java:311)
at org.apache.velocity.runtime.parser.Parser.parse(Parser.java:105)
at org.apache.velocity.runtime.RuntimeInstance.parse(RuntimeInstance.java:1131)
at org.apache.velocity.runtime.RuntimeInstance.parse(RuntimeInstance.java:1086)
at org.apache.velocity.Template.process(Template.java:124)
at org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource(ResourceManagerImpl.java:446)
at org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:354)
at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1400)
at org.apache.velocity.runtime.directive.Parse.render(Parse.java:198)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:175)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
at org.apache.velocity.Template.merge(Template.java:328)
at org.apache.velocity.Template.merge(Template.java:235)
"1946923020@qtp-2060763463-4" prio=6 tid=0x000000000c6dc000 nid=0x48a4 runnable [0x0000000013bcd000]
java.lang.Thread.State: RUNNABLE
at org.apache.velocity.runtime.parser.Parser.jj_scan_token(Parser.java:3340)
at org.apache.velocity.runtime.parser.Parser.jj_3R_56(Parser.java:2768)
at org.apache.velocity.runtime.parser.Parser.jj_3R_29(Parser.java:3000)
at org.apache.velocity.runtime.parser.Parser.jj_3_8(Parser.java:2834)
at org.apache.velocity.runtime.parser.Parser.jj_3_7(Parser.java:2878)
at org.apache.velocity.runtime.parser.Parser.jj_2_7(Parser.java:2560)
at org.apache.velocity.runtime.parser.Parser.Reference(Parser.java:1317)
at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:354)
at org.apache.velocity.runtime.parser.Parser.Directive(Parser.java:888)
at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:373)
at org.apache.velocity.runtime.parser.Parser.process(Parser.java:311)
at org.apache.velocity.runtime.parser.Parser.parse(Parser.java:105)
at org.apache.velocity.runtime.RuntimeInstance.parse(RuntimeInstance.java:1131)
at org.apache.velocity.runtime.RuntimeInstance.parse(RuntimeInstance.java:1086)
at org.apache.velocity.Template.process(Template.java:124)
at org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource(ResourceManagerImpl.java:446)
at org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:354)
at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1400)
at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1380)
at org.apache.velocity.runtime.VelocimacroFactory.initVelocimacro(VelocimacroFactory.java:202)
- locked <0x00000000cd74bae8> (a org.apache.velocity.runtime.VelocimacroFactory)
at org.apache.velocity.runtime.RuntimeInstance.init(RuntimeInstance.java:261)
- locked <0x00000000cd950eb8> (a org.apache.velocity.runtime.RuntimeInstance)
at org.apache.velocity.app.VelocityEngine.init(VelocityEngine.java:107)
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[jira] Commented: (VELOCITY-775) Hanging in jj_scan_token
Posted by "Nathan Bubna (JIRA)" <de...@velocity.apache.org>.
[ https://issues.apache.org/jira/browse/VELOCITY-775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903448#action_12903448 ]
Nathan Bubna commented on VELOCITY-775:
---------------------------------------
This seems likely to be a bug in JavaCC, though i can't be sure right now. Considering the difficulty of reproducing this (3 hours under load), please provide as much info as possible about the environment (OS, JVM, servlet engine, etc) and also your velocity.properties, if you change any from the defaults. It would be good to know parser pool size, resource loader, etc.
> Hanging in jj_scan_token
> ------------------------
>
> Key: VELOCITY-775
> URL: https://issues.apache.org/jira/browse/VELOCITY-775
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Environment: Velocity 1.6.3
> Reporter: Dominik Stadler
>
> I have the same issue as reported in VELOCITY-562, velocity hangs in method Parser.jj_scan_token(). I can reproduce it by running heavy load on my application for a few hours.
> Currently running 1.6.3, I looked at the issues fixed in 1.6.4, VELOCITY-718 seems not related, but I will now upgrade to 1.6.4 and see if the same happens again.
> The application is using velocity in up to 3 threads simultaneously, nothing is shared between threads, relevant stack traces from a thread dump are as follows, one thread is currently not inside velocity at all:
> "1334671070@qtp-2060763463-85" prio=6 tid=0x00000000181c5800 nid=0x6004 runnable [0x00000000110dd000]
> java.lang.Thread.State: RUNNABLE
> at org.apache.velocity.runtime.parser.Parser.jj_scan_token(Parser.java:3340)
> at org.apache.velocity.runtime.parser.Parser.jj_3R_56(Parser.java:2768)
> at org.apache.velocity.runtime.parser.Parser.jj_3R_29(Parser.java:3000)
> at org.apache.velocity.runtime.parser.Parser.jj_3_8(Parser.java:2834)
> at org.apache.velocity.runtime.parser.Parser.jj_3_7(Parser.java:2878)
> at org.apache.velocity.runtime.parser.Parser.jj_2_7(Parser.java:2560)
> at org.apache.velocity.runtime.parser.Parser.Reference(Parser.java:1317)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:354)
> at org.apache.velocity.runtime.parser.Parser.IfStatement(Parser.java:1530)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:346)
> at org.apache.velocity.runtime.parser.Parser.Directive(Parser.java:888)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:373)
> at org.apache.velocity.runtime.parser.Parser.process(Parser.java:311)
> at org.apache.velocity.runtime.parser.Parser.parse(Parser.java:105)
> at org.apache.velocity.runtime.RuntimeInstance.parse(RuntimeInstance.java:1131)
> at org.apache.velocity.runtime.RuntimeInstance.parse(RuntimeInstance.java:1086)
> at org.apache.velocity.Template.process(Template.java:124)
> at org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource(ResourceManagerImpl.java:446)
> at org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:354)
> at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1400)
> at org.apache.velocity.runtime.directive.Parse.render(Parse.java:198)
> at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:175)
> at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
> at org.apache.velocity.Template.merge(Template.java:328)
> at org.apache.velocity.Template.merge(Template.java:235)
> "1946923020@qtp-2060763463-4" prio=6 tid=0x000000000c6dc000 nid=0x48a4 runnable [0x0000000013bcd000]
> java.lang.Thread.State: RUNNABLE
> at org.apache.velocity.runtime.parser.Parser.jj_scan_token(Parser.java:3340)
> at org.apache.velocity.runtime.parser.Parser.jj_3R_56(Parser.java:2768)
> at org.apache.velocity.runtime.parser.Parser.jj_3R_29(Parser.java:3000)
> at org.apache.velocity.runtime.parser.Parser.jj_3_8(Parser.java:2834)
> at org.apache.velocity.runtime.parser.Parser.jj_3_7(Parser.java:2878)
> at org.apache.velocity.runtime.parser.Parser.jj_2_7(Parser.java:2560)
> at org.apache.velocity.runtime.parser.Parser.Reference(Parser.java:1317)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:354)
> at org.apache.velocity.runtime.parser.Parser.Directive(Parser.java:888)
> at org.apache.velocity.runtime.parser.Parser.Statement(Parser.java:373)
> at org.apache.velocity.runtime.parser.Parser.process(Parser.java:311)
> at org.apache.velocity.runtime.parser.Parser.parse(Parser.java:105)
> at org.apache.velocity.runtime.RuntimeInstance.parse(RuntimeInstance.java:1131)
> at org.apache.velocity.runtime.RuntimeInstance.parse(RuntimeInstance.java:1086)
> at org.apache.velocity.Template.process(Template.java:124)
> at org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource(ResourceManagerImpl.java:446)
> at org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:354)
> at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1400)
> at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1380)
> at org.apache.velocity.runtime.VelocimacroFactory.initVelocimacro(VelocimacroFactory.java:202)
> - locked <0x00000000cd74bae8> (a org.apache.velocity.runtime.VelocimacroFactory)
> at org.apache.velocity.runtime.RuntimeInstance.init(RuntimeInstance.java:261)
> - locked <0x00000000cd950eb8> (a org.apache.velocity.runtime.RuntimeInstance)
> at org.apache.velocity.app.VelocityEngine.init(VelocityEngine.java:107)
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