Magnus Leßmann created FREEMARKER-109:
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Summary: 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: 2.3.28, 2.3.27-incubating
Reporter: Magnus Leßmann
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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