Hello,
I run into something that looks like non spec-conforming behavior and would
like to check with you if it's really a bug or I'm having incorrect expectations.
I have TLD located in JAR under META-INF/tlds/hi.tld. The JAR also contains
web-fragment.xml with taglib mapping like this:
<web-fragment ...>
<jsp-config>
<taglib>
<taglib-uri>/HiTag</taglib-uri>
<taglib-location>/tlds/hi.tld</taglib-location>
</taglib>
</jsp-config>
</web-fragment>
This JAR is loaded in a WAR, that contains JSP with following directive:
<%@ taglib uri="/HiTag" prefix="say"%>
During deployment in apache-tomcat-9.0.8 I see this warning:
30-May-2018 10:38:42.240 WARNING
[ContainerBackgroundProcessor[StandardEngine[Catalina]]]
org.apache.jasper.servlet.TldScanner.scanJspConfig Failed to process TLD with
path [/tlds/hi.tld] and URI [/HiTag]. The specified path does not exist.
and the jsp compilation fails.
When I move the TLD under META-INF/resources, then it starts to work.
When I use implicit mapping by defining <uri> element in hi.tld instead of
explicit mapping in web-fragment.xml, that works too.
The JSP spec says that TLDs must be in META-INF/ or subdirectories:
[quote]
JSP 7.3.1
When deployed inside a JAR file, the tag library descriptor files must be in
the META-INF directory, or a subdirectory of it.
[/quote]
I think it's caused by this line in TldScanner.java:
https://github.com/apache/tomcat/blob/TOMCAT_8_0_0_RC10/java/org/apache/jasper/servlet/TldScanner.java#L177
where ServletContext#getResource() would naturally see only files under
META-INF/resources/ dir.
Thanks for any opinions!
--
Tomas Hofman
Software Engineer, JBoss SET
Red Hat
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