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https://issues.apache.org/jira/browse/GROOVY-9507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17083963#comment-17083963
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Paul King commented on GROOVY-9507:
-----------------------------------
The issue can illustrated outside templates and seems to be an issue with the
grammar. It can be simplified to:
{code}
null.each { ; x = 0 }
{code}
which passes under 2.5.x but fails in 3+ with:
{noformat}
Unexpected input: '{'; Expecting <EOF> at line: 1, column: 11
{noformat}
It can be fixed by removing the unneeded semicolon. I don't know whether we
could adjust StreamingTemplateEngine to do that but seems worth seeing if the
grammar can be tweaked first.
> JSP style loop in StreamingTemplateEngine template results in
> TemplateParseException
> ------------------------------------------------------------------------------------
>
> Key: GROOVY-9507
> URL: https://issues.apache.org/jira/browse/GROOVY-9507
> Project: Groovy
> Issue Type: Bug
> Components: Templating
> Affects Versions: 3.0.3
> Reporter: Christopher Chase
> Priority: Major
>
>
> The example below works as expected when run in Groovy 2.5.8, yet it fails
> when run in Groovy 3.0.3
>
>
> {code:java}
> TemplateEngine engine = new StreamingTemplateEngine()
> Template template = engine.createTemplate('''
> <ul>
> <% items.each { %>
> <li>${it}</li>
> <% } %>
> </ul>
> ''')
> println template.make([items : [1,2,3,4]])
> {code}
>
> Expected output (and the output 2.5.8 yields):
>
> {noformat}
> <ul>
> <li>1</li>
> <li>2</li>
> <li>3</li>
> <li>4</li>
> </ul>{noformat}
>
> Exception 3.0.3 gives:
>
> {noformat}
> Exception in thread "main" groovy.text.TemplateParseException: Template parse
> error 'Unexpected input: '{'; Expecting RBRACE ' at line 3, column 27
> 2: <ul>
> --> 3: <% items.each { %>
> 4: <li>${it}</li>{noformat}
>
>
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