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https://issues.apache.org/jira/browse/VELOCITY-775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903448#action_12903448
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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:
> "1334671...@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)
> "1946923...@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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