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https://issues.apache.org/jira/browse/WW-4629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15270179#comment-15270179
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Aleksandr Mashchenko commented on WW-4629:
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Struts2 now use Tiles version 2.2.2, which supports [expression
languages|https://tiles.apache.org/2.2/framework/tutorial/advanced/el-support.html#OGNL_Support].
In Tiles definition xml it looks something like that -
{{OGNL:requestScope.body}}, the {{OGNL:}} part tells which expression language
is used.
Try to remove semicolon from your {{ATTN: Missing Page Title!}} definition or
escape it somehow and see if it works.
> Tile definition Inheritance/overriding is broken in Struts2 tiles plugin
> 2.3.28+
> --------------------------------------------------------------------------------
>
> Key: WW-4629
> URL: https://issues.apache.org/jira/browse/WW-4629
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - Tiles
> Affects Versions: 2.3.28
> Reporter: paul deg
>
> Tiles definition working with Struts2 release 2.3.24 stopped working in
> 2.3.28+.
> Example:
> <definition name="layouts.enroll.resp"
> template="/WEB-INF/tiles/EnrollmentLayout_resp.jsp" >
> <put-attribute name="app" value="Banking" />
> <put-attribute name="title" value="ATTN: Missing Page Title!" />
> <put-attribute name="content" />
> </definition>
> <definition name="enrollment.resp.choose" extends="layouts.enroll.resp">
> <put-attribute name="content" value="/ChooseService_Captcha.jsp" />
> <put-attribute name="title" value="Sign Up for Online
> Access" cascade="true"/>
> </definition>
> Value of attribute "title" defined in "enrollment.resp.choose" definition is
> not available in any scope.
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