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https://issues.apache.org/jira/browse/WW-5517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17914310#comment-17914310
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Lukasz Lenart commented on WW-5517:
-----------------------------------

It's due to [allowlist 
capability|https://cwiki.apache.org/confluence/display/WW/Struts+6.x.x+to+7.x.x+migration#Struts6.x.xto7.x.xmigration-OGNLallowlistcapability],
 you can disable it when debugging.

> The debug Struts tag throws an error.
> -------------------------------------
>
>                 Key: WW-5517
>                 URL: https://issues.apache.org/jira/browse/WW-5517
>             Project: Struts 2
>          Issue Type: Bug
>    Affects Versions: 7.0.0
>            Reporter: Boris Kole
>            Priority: Major
>             Fix For: 7.0.1
>
>
> When using the debug Struts tag it throws the following errors.
> |{*}Messages{*}:| # org.apache.struts2.text.DefaultTextProvider.texts
>  # Caught an exception while getting the property values of 
> org.apache.struts2.text.DefaultTextProvider@61995fff
>  # An exception occurred processing [/home.jsp] at line [3] 1: <%@ taglib 
> prefix="s" uri="/struts-tags" %> 2: 3: <s:debug/> Stacktrace:|
> |{*}File{*}:|org/apache/jasper/servlet/JspServletWrapper.java|
> |{*}Line number{*}:|599|
> The JSP I used:
> {code:java}
> <%@ taglib prefix="s" uri="/struts-tags" %>
> <s:debug/> {code}
>  



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