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https://issues.apache.org/jira/browse/VELOCITY-748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791331#action_12791331
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Jarkko Viinamäki commented on VELOCITY-748:
-------------------------------------------
This looks like a duplicate of VELOCITY-718
> Caught in the while-loop
> ------------------------
>
> Key: VELOCITY-748
> URL: https://issues.apache.org/jira/browse/VELOCITY-748
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.6.2
> Reporter: Johann Weber
> Priority: Critical
>
> Caught in the infinity loop due to concurrent access to the get and put
> methods of HashMap which are not synchronized.
> Stacktrace:
> java.lang.Thread.State: RUNNABLE
> at java.util.HashMap.get(Unknown Source)
> at
> org.apache.velocity.util.introspection.ClassMap$MethodCache.get(ClassMap.java:249)
> at
> org.apache.velocity.util.introspection.ClassMap.findMethod(ClassMap.java:102)
> at
> org.apache.velocity.util.introspection.IntrospectorBase.getMethod(IntrospectorBase.java:105)
> at
> org.apache.velocity.util.introspection.Introspector.getMethod(Introspector.java:94)
> at
> org.apache.velocity.runtime.parser.node.PropertyExecutor.discover(PropertyExecutor.java:99)
> at
> org.apache.velocity.runtime.parser.node.PropertyExecutor.<init>(PropertyExecutor.java:56)
> at
> org.apache.velocity.util.introspection.UberspectImpl.getPropertyGet(UberspectImpl.java:246)
> at
> org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:148)
> at
> org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:252)
> at
> org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReference.java:460)
> at
> org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpression.java:62)
> at
> org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:85)
> at
> org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
> at
> org.apache.velocity.runtime.directive.Parse.render(Parse.java:260)
> 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.runtime.directive.Parse.render(Parse.java:260)
> 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)
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