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https://issues.apache.org/jira/browse/WW-4422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15509067#comment-15509067
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Lukasz Lenart commented on WW-4422:
-----------------------------------

hmm... another thing - when you remove Struts tags from {{template2.jsp}} 
everything works ...

> Component inside Component - "Could not render JSP template"
> ------------------------------------------------------------
>
>                 Key: WW-4422
>                 URL: https://issues.apache.org/jira/browse/WW-4422
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Other
>    Affects Versions: 2.3.16.3
>         Environment: Windows, Pluto Portlets
>            Reporter: Mark Goertzen
>              Labels: component
>             Fix For: 2.3.31, 2.5.3
>
>
> Trying to render a Component inside a Component will fail with logged error 
> "JspTemplateEngine.error(34) | Could not render JSP template". There is a 
> workaround, which is simply to have ANY struts tag after the inner component 
> declared in the <param> of the outer component. Also, the inner component 
> only causes this failure when it has struts tags inside it.
> eg. This fails:
> {code:xml}
> <s:component ... template="someTemplate.jsp">
>   <s:param name="body">
>     <s:component ... template="otherTemplate.jsp"><!-- only fails if there is 
> struts tag(s) inside otherTemplate.jsp -->
>       <!--other params-->
>     </s:component>
>   </s:param>
> <s:component>
> {code}
> Note that param body is rendered inside someTemplate.jsp like this:
> {code:xml}
> <s:property value="%{parameters.body}" escapeHtml="false" />
> {code}
> eg. This will work exactly as expected:
> {code:xml}
> <s:component ... template="someTemplate.jsp">
>   <s:param name="body">
>     <s:component ... template="otherTemplate.jsp"><!-- only fails if there is 
> struts tag(s) inside this template -->
>       <!--other params-->
>     </s:component>
>     <s:if test=""><!-- DO NOT DELETE THIS LINE - Fixes "component inside 
> component" bug in Struts 2.3.16.3 --></s:if>
>   </s:param>
> <s:component>
> {code}
> Note that the "if" tag can be any struts tag and it will work.



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