ResolverUtil fails to load action beans outside WEB-INF under JBoss
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Key: STS-397
URL: http://mc4j.org/jira/browse/STS-397
Project: Stripes
Issue Type: Bug
Affects Versions: Release 1.4.3
Environment: Windows 2000, JDK 1.5.0.11, JBoss 4.0.2
Reporter: Jan Moravec
Assigned To: Tim Fennell
I encountered problem with Stripes failing to find action beans located outside
WEB-INF/class. No exception was thrown, the action beans just were not found.
After some digging I came to the following conclusion and solution:
The current dynamic action bean discovery implementation makes use of the URLs
returned from URLClassLoaders found in the CL hierarchy of the current thread
context CL. This is an example of the CL hierarchy with dumped URLs of the
found URLClassLoader instances under JBoss:
10:56:43,218 INFO (RMI TCP Connection(3)-192.168.1.65) [STDOUT]
WebappClassLoader
delegate: false
repositories:
/WEB-INF/classes/
----------> Parent Classloader:
[EMAIL PROTECTED]
file:/C:/JBoss/server/eshops/tmp/deploy/tmp5995eshops.ear-contents/eshops-exp.war/WEB-INF/classes/
[EMAIL PROTECTED]
empty URLs
[EMAIL PROTECTED]
url=file:/C:/JBoss/server/eshops/tmp/deploy/tmp5995eshops.ear ,addedOrder=28}
empty URLs
[EMAIL PROTECTED]
empty URLs
[EMAIL PROTECTED]
empty URLs
[EMAIL PROTECTED]
file:/C:/Java/Jdk1.5/lib/tools.jar
file:/C:/JBoss/bin/run.jar
[EMAIL PROTECTED]
file:/C:/Java/Jdk1.5/jre/lib/ext/bcprov.jar
file:/C:/Java/Jdk1.5/jre/lib/ext/dnsns.jar
file:/C:/Java/Jdk1.5/jre/lib/ext/localedata.jar
file:/C:/Java/Jdk1.5/jre/lib/ext/localedata.pack
file:/C:/Java/Jdk1.5/jre/lib/ext/sunjce_provider.jar
file:/C:/Java/Jdk1.5/jre/lib/ext/sunpkcs11.jar
As one can see, the URLs of EAR's utility JARs are not exposed by JBoss
org.jboss.mx.loading.UnifiedClassLoader3. And that is even though the UCL is a
subclass of URLClassLoader! Its getURLs method seems to return an empty array.
One needs to call getClasspath() method on the UCL to obtain the array of URLs
of JARs inside the deployed EAR. These URLs can then be normally scanned for
ActionBean instances. I have a patched version of ResolverUtil class that seems
to work. I will attach it later if I find out how to do that (no file upload on
this screen).
Maybe the action bean discovery mechanism should be configurable because you
may need similar hacks for other application servers....
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