Can't use container level taglibs
---------------------------------
Key: JBAS-1602
URL: http://jira.jboss.com/jira/browse/JBAS-1602
Project: JBoss Application Server
Type: Bug
Components: Web (Tomcat) service
Reporter: Stan Silvert
Priority: Critical
JBoss/Tomcat needs a way to install tag libraries globally so they are
available to all web applications. This functionality is mentioned in the JSP
2.0 spec section 7.3.5. In Tomcat standalone, you can do this, but it
doesnât work in JBoss/Tomcat.
The way this works is that the Jasper TldLocationsCache âScans all JARs
accessible to the webapp's classloader and its parent classloaders for TLDs.â
If I put my jar into Tomcat standaloneâs common/lib directory then the tag
library will be shared across all web apps. Iâve tried putting the jar in
several âwell knownâ locations in JBoss/Tomcat and nothing seems to work.
For Reference, Iâve attached the TldLocationsCache source code from Tomcat
5.5.8.
Concerning TldLocationsCache, Scott Stark says:
"This class is useless for non-URLClassLoaders and URLClassLoaders that do not
expose their classpath via getURLs which is what we currently do because of an
old bad behavior with annotated codebases of rmi classes. "
Remy Maucherat offered this as a possible solution:
Would it be possible to have the ENCLoader facade return more interesting
things ?
/**
* A trival extension of URLClassLoader that uses an empty URL[] as its
* classpath so that all work is delegated to its parent.
*/
static class ENCLoader extends URLClassLoader
{
private URL[] urllist = new URL[0];
ENCLoader(ClassLoader parent)
{
super(new URL[0], parent);
}
void addURLInternal(URL url)
{
URL[] result = new URL[urllist.length + 1];
for (int i = 0; i < urllist.length; i++)
result[i] = urllist[i];
result[urllist.length] = url;
urllist = result;
}
public URL[] getURLs()
{
return urllist;
}
}
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