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https://issues.apache.org/jira/browse/FREEMARKER-109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Dekany resolved FREEMARKER-109.
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Resolution: Fixed
Fix Version/s: 2.3.29
Thanks! Fix committed for the next release.
> Invalid function signature - IAE when loading TLD functions with line breaks.
> -----------------------------------------------------------------------------
>
> Key: FREEMARKER-109
> URL: https://issues.apache.org/jira/browse/FREEMARKER-109
> Project: Apache Freemarker
> Issue Type: Bug
> Components: jsp
> Affects Versions: 2.3.27-incubating, 2.3.28
> Reporter: Magnus Leßmann
> Priority: Minor
> Fix For: 2.3.29
>
> Attachments: FreemarkerIssueDemo.java, demo.ftl, demo.tld
>
>
> When a taglib descriptor file contains a function definition with line breaks
> in the function signature, the TaglibFactory fails to load the taglib with an
> ``IllegalArgumentException`` complaining about an invalid function signature.
> The pattern ``FUNCTION_SIGNATURE_PATTERN`` from ``TagLibMethodUtil`` does not
> support function signatures containing newline characters.
> However, having the ability for newline characters is important to maintain
> readability with the FQNs.
> I did not see any reason why line breaks would be forbidden in TLD files as
> the taglib can be loaded by our application and [the XML definition clearly
> states this as allowed|https://www.w3.org/TR/REC-xml/#sec-line-ends]
> I have attached an example. And I believe fixing this will not be that big of
> a deal.
> Maybe setting the flag ``Pattern.DOTALL`` is enough to resolve this.
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