[rules-users] Cannot find nested resources when dynamically loading rules JAR.

[chrisjr]

Hi,

I am trying to load a JAR which contains only a change set XML and its DRL
files, but Drools (both 5.1.1 and 5.4.0) always complains that the DRL files
cannot be found because they don't exist. For example:

<?xml version="1.0" encoding="UTF-8"?>
<change-set xmlns='http://drools.org/drools-5.0/change-set'
    xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
    xs:schemaLocation='http://drools.org/drools-5.0/change-set
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/main/resources/change-set-1.0.0.xsd'>
    <add>
        <resource source='classpath:com/my/stuff/rules/Stuff.drl' type='DRL'
/>
    </add>
</change-set>

So Drools is obviously loading my change set XML correctly, at the very
least. The  Drools documentation
<http://docs.jboss.org/drools/release/5.4.0.Final/drools-expert-docs/html/ch03.html#d0e2434>  
implies that what I am doing is correct, but it looks like the Change Set
XML parser is forgetting to use my custom class loader when reading the
<resource> elements:

The following patch fixes my problem:
--- org/drools/xml/changeset/ResourceHandler.java.orig	2012-09-20
17:08:18.209547000 +0100
+++ org/drools/xml/changeset/ResourceHandler.java	2012-09-20
17:10:22.019335902 +0100
@@ -77,7 +77,7 @@
         InternalResource resource = null;
         
         if ( src.trim().startsWith( "classpath:" ) ) {
-            resource = new ClassPathResource( src.substring( src.indexOf(
':' ) + 1 ) );
+            resource = new ClassPathResource( src.substring( src.indexOf(
':' ) + 1 ), parser.getClassLoader() );
         } else {
             resource = new UrlResource( src );
            
((UrlResource)resource).setBasicAuthentication(basicAuthentication);

Is this patch correct please, or have I completely misunderstood the Drools
documentation?
Thanks,
Chris




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