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https://issues.apache.org/jira/browse/WW-4494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14520974#comment-14520974
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Lukasz Lenart commented on WW-4494:
-----------------------------------
As far I understand you can always revert to the old version with defining a
key in {{freemarker.properties}}
{noformat}
incompatible_improvements=2.3.0
{noformat}
> Improve FreemarkerManager to activate new freemarker feature
> ------------------------------------------------------------
>
> Key: WW-4494
> URL: https://issues.apache.org/jira/browse/WW-4494
> Project: Struts 2
> Issue Type: Improvement
> Affects Versions: 2.3.20
> Reporter: zhouyanming
> Fix For: 2.3.24
>
>
> http://freemarker.org/docs/pgui_config_incompatible_improvements.html#pgui_config_incompatible_improvements_how_to_set
> use "new Configuration(Configuration.VERSION_2_3_22)" instead of "new
> Configuration( )"
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