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https://issues.apache.org/struts/browse/WW-2246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44445#action_44445
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Musachy Barroso commented on WW-2246:
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It seems to me like FM should not throw an exception in this case, as it should
use any writer that is there already (it even says that they should use
assertions if jdk was >= 1.4). There is a comment for this code in S2:
// the BodyContent JSP writer doesn't like it when FM flushes automatically --
// so let's just not do it (it will be flushed eventually anyway)
which makes not want to change it.
> Impossible to use custom jsp taglibs inside custom FM template tags
> -------------------------------------------------------------------
>
> Key: WW-2246
> URL: https://issues.apache.org/struts/browse/WW-2246
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - Tags
> Affects Versions: 2.0.9
> Environment: Windows OS, J2SE 1.6, J2EE 5, Struts2
> Reporter: Alexey Koloskov
> Fix For: 2.1.3
>
>
> I create custom UI tags for Struts2 using FreeMarker. Inside FreeMarker
> template I use custom jsp tags library, e.g. displaytag as follows:
> <#assign display=JspTaglibs["http://displaytag.sf.net/el";]>
> <@display.table name="parameters.entities"/>.
> But during template rendering I get a such error:
> "freemarker.template.TemplateModelException: out != pageContext.getOut().
> Out is [EMAIL PROTECTED] pageContext.getOut()
> is null" at
> freemarker.ext.jsp.TagTransformModel.getWriter(TagTransformModel.java:156).
> It seems like a bug because for the first time
> FreeMarkerPageContext.getOut() always return null, and the check if(out !=
> pageContext.getOut()) is always true for JSPWriter.
> Stack trace:
> error when rendering out != pageContext.getOut(). Out is [EMAIL PROTECTED]
> pageContext.getOut() is null
> The problematic instruction:
> ----------
> ==> user-directive display.table [on line 4, column 1 in
> template/xhtml/EntityList.ftl]
> ----------
> Java backtrace for programmers:
> ----------
> freemarker.template.TemplateModelException: out != pageContext.getOut().
> Out is [EMAIL PROTECTED] pageContext.getOut() is null
> at
> freemarker.ext.jsp.TagTransformModel.getWriter(TagTransformModel.java:156)
> at freemarker.core.Environment.visit(Environment.java:220)
> ...(tale is omitted)
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