Problem with Oracle JVM classLoader
-----------------------------------
Key: DISCOVERY-13
URL: https://issues.apache.org/jira/browse/DISCOVERY-13
Project: Commons Discovery
Issue Type: Improvement
Affects Versions: 0.4, 0.2
Environment: Oracle Java stored procedure (oracle versions 8i -> 11g)
Any OS
Reporter: Leo Blumencweig
Priority: Minor
Fix For: 0.4, 0.2
First of all, excuse my bad english (I'm an spanish speaker)
Starting in version 8i, Oracle provides an embedded JVM inside th databases, in
order to develop a stored procedure inJava language, later to be invoked via
PL/SQL.
Saddly, the JVM has some quirks, for example an somehow brain-damaged
classLoader (oracle.aurora.rdbms.OracleClassLoader).
This JVM stores the classes inside table objects (very reasonable).
This leads to some problem: the resources haves some strange URL (example:
jserver:/resource/schema/NAME_OF_THE_SCHEMA/ar.com.menhir.config.properties).
It will be not problema at all except because it's brain damage insist in
telling that the above URL works only with RESOURCES and not with CLASSES!!
for example, the following example
private static void getData ( ClassLoader cl , String str ){
System.out.println(str +".class" + "->
"+cl.getResource(str+".class"));
System.out.println(str +".class" + "->
"+ClassLoader.getSystemResource(str+".class"));
}
...
getData(Test.class.getClassLoader(),"ar.com.menhir.wstest.Test");
...
gives this 2 results:
with normal classLoader ( sun.misc.Launcher$AppClassLoader)
ar/com/menhir/wstest/Test.class->
file:/C:/Users/LeoB/workspace2/prueba/bin/ar/com/menhir/wstest/Test.class
ar/com/menhir/wstest/Test.class->
file:/C:/Users/LeoB/workspace2/prueba/bin/ar/com/menhir/wstest/Test.class
with oracle classLoader (oracle.aurora.rdbms.OracleClassLoader)
ar/com/menhir/wstest/Test.class-> null
ar/com/menhir/wstest/Test.class-> null
The problem arises in
org.apache.commons.discovery.resource.classes.DiscoverClasses, where the line
60
final String resourceName = className.replace('.','/') + ".class";
points to a nonexistente resource.
my workaround was to hack this class with the following:
final String resourceName =
ar.com.menhir.oracle.resources.Utils.getResourcePrefix(className).replace('.','/')
+ ".class";
where getResourcePrefix gets the correct prefix for this class.
You must note that this is a somehow brutal way of solving. I'm interested in
contribute with the wright way, but I'm not very sure of where to start.
Could you please help me?
Thank you
Leo Blumencweig
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