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https://issues.apache.org/jira/browse/WW-5009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16759358#comment-16759358
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ASF GitHub Bot commented on WW-5009:
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aleksandr-m commented on pull request #328: WW-5009 EmptyStackException in JSON
plugin due to concurrency
URL: https://github.com/apache/struts/pull/328
@yasserzamani I know that you've assigned that issue to yourself, but I
think it is the most simple solution that we can merge in 2.5.x branch. Can you
take a look.
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> EmptyStackException in JSON plugin due to concurrency
> -----------------------------------------------------
>
> Key: WW-5009
> URL: https://issues.apache.org/jira/browse/WW-5009
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - JSON
> Affects Versions: 2.5.20
> Environment: JDK 1.8_0_191
> Tomcat 9.0.12
> Reporter: Eduardo Quintanilla
> Assignee: Yasser Zamani
> Priority: Critical
> Labels: json, json-rpc
> Fix For: 2.5.21, 2.6
>
> Attachments: logs.txt, struts-json-example-master.zip
>
>
> EmptyStackException in JSON plugin due to concurrency
> Note: The issue was found in an app that was upgraded from version 2.3.34
> Logs: [^logs.txt]
> I created a sample application that should help reproducing the error.
> [^struts-json-example-master.zip]
> The error happened opening the app (localhost/struts-json-example) in 4
> different browsers / sessions.
> As a workaround I have overridden the JSONInterceptor so a new instance of
> JSONUtil is used with every request and the issue is not happening anymore. I
> suppose there is a performance cost with that change but for now it works.
>
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