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https://issues.apache.org/jira/browse/WW-5009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16755889#comment-16755889
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Eduardo Quintanilla edited comment on WW-5009 at 1/30/19 4:12 PM:
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The example is with the published (not-modified) Struts. The workaround was
applied in a local app with a custom Interceptor extending JSONInterceptor.
Something like:
{code:java}
<package name="custom-json" extends="json-default">
<interceptors>
<interceptor name="json" class="app.example.CustomJsonInterceptor"/>
</interceptors>
</package>
{code}
was (Author: eduardo quintanilla):
The example is with the published (not-modified) Struts. The workaround was
applied in a local app
> 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
> 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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