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https://issues.apache.org/jira/browse/WW-5009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16760705#comment-16760705
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Hudson commented on WW-5009:
----------------------------
SUCCESS: Integrated in Jenkins build Struts-master-JDK8 #234 (See
[https://builds.apache.org/job/Struts-master-JDK8/234/])
WW-5009 EmptyStackException in JSON plugin due to concurrency (amashchenko: rev
be457f4241418b75cdcf0a9b71775dde91f94163)
* (edit) plugins/json/src/main/java/org/apache/struts2/json/JSONInterceptor.java
* (edit)
plugins/json/src/test/java/org/apache/struts2/json/JSONInterceptorTest.java
> 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: Aleksandr Mashchenko
> 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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