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https://issues.apache.org/jira/browse/SLING-2012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005126#comment-13005126
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Michael Dürig commented on SLING-2012:
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The issue might be due to a race in ScalaScriptEngine#eval():
Thread A: acquires the write lock
Thread A: calls interpreter.compile
Thread A: leaves the write lock
Thread B: acquires the write lock
Thread B: calls interpreter.compile
Thread B: leaves the write lock
Thread A: acquires the read lock
Thread A: calls interpreter.execute
At this point Thread A will call the classes generated by the script of Thread
B (*)
(*) the classes might be different due to the bindings wrapper generated on the
fly. See SLING-1236
> Sling Scala Hello World example concurrent access fails
> -------------------------------------------------------
>
> Key: SLING-2012
> URL: https://issues.apache.org/jira/browse/SLING-2012
> Project: Sling
> Issue Type: Bug
> Components: Scripting
> Reporter: Alex Parvulescu
> Priority: Minor
> Attachments: SLING-2012-logs.zip, ScriptEngineTest.scala.zip
>
>
> https://cwiki.apache.org/confluence/display/SLING/Using+Scala+with+Sling
> Installed Scala Hello World. Checked
> http://localhost:8888/content/helloworld.html it works!
> Next, hit refresh 2/3 times, it breaks with 500 errors.
> I'll attach some error logs
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