MyFaces Tag Library Descriptors are not found by the Jasper Compiler
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Key: GERONIMO-2955
URL: https://issues.apache.org/jira/browse/GERONIMO-2955
Project: Geronimo
Issue Type: Bug
Security Level: public (Regular issues)
Components: web
Affects Versions: 2.0-M3
Reporter: Paul McMahan
Assigned To: Paul McMahan
Priority: Critical
Jasper's technique for finding Tag Library Descriptors (TLDs) does not work
well with Geronimo's MultiParentClassLoader. The Jasper compiler tries to
find TLDs in jar files by getting the list of jars from the webapp's
classloader and scanning them for META-INF/**.tld. Then it repeats this
process up the classloader hierarchy (at least what it *thinks* is the
classloader hierarchy) by calling ClassLoader.getParent(). That works OK when
then TLDs are in the webapp's WEB-INF/lib or in the JRE's system or application
classloader. But this technique doesn't work in Geronimo because there are
sometimes jars in the classloader hierarchy that are only accessible by using
Geronimo's special MultiParentClassLoader.getParents() method.
The Jasper code referred to above can be viewed in the scanJars() method of
this class:
http://svn.apache.org/repos/asf/tomcat/tc6.0.x/tags/TOMCAT_6_0_10/java/org/apache/jasper/compiler/TldLocationsCache.java
Because of this limitation the Jasper compiler does not find the TLDs in
myfaces-impl-2.0-SNAPSHOT.jar because it doesn't find the classloader
containing that jar when it looks up the direct lineage of classloaders. This
causes the following error message when a JSP refers to the JSF taglibs:
{quote}
javax.servlet.ServletException: The absolute uri: http://java.sun.com/jsf/html
cannot be resolved in either web.xml or the jar files deployed with this
application
{quote}
The MyFaces TLDs need to be made accessible to Jasper so that webapps can
reference the JSF taglibs in their JSPs without copying the TLDs into their
WARs.
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