NoClassDefFoundError & LinkageError on deployment

[bsnavin]

I deployed a .sar with a service MBean that loads an XML and parses it with the "Commons Digester" component. The corresponding commons-digester.jar & dependent jars are also included in the .sar

My sar has defined a separate loader repository as multiple instances of the service can be deployed on the same JBoss server. When I deploy this into the "default" configuration of JBoss 3.2.x with "java2ParentDelegation=false", it works just fine.

But when I use "java2ParentDelegation=true", I get the following errors:

First time deployment after server startup :

Caused by: java.lang.NoClassDefFoundError: org/apache/commons/digester/ObjectCreationFactory
 at org.apache.commons.digester.Digester.addFactoryCreate(Digester.java:2044)
 at org.apache.commons.digester.Digester.addFactoryCreate(Digester.java:1936)
 at org.apache.commons.digester.xmlrules.DigesterRuleParser.addRuleInstances(DigesterRuleParser.java:240)
 at org.apache.commons.digester.Digester.addRuleSet(Digester.java:1663)
 at org.apache.commons.digester.xmlrules.FromXmlRuleSet.addRuleInstances(FromXmlRuleSet.java:145)
 at org.apache.commons.digester.Digester.addRuleSet(Digester.java:1663)
 at org.apache.commons.digester.xmlrules.DigesterLoader.createDigester(DigesterLoader.java:91)

I undeploy the .sar and redeploy it (without a server restart), different error is thrown:

Caused by: java.lang.LinkageError: loader constraints violated when linking org/apache/commons/digester/ObjectCreationFactory class
 at org.apache.commons.digester.xmlrules.DigesterRuleParser.addRuleInstances(DigesterRuleParser.java:240)
 at org.apache.commons.digester.Digester.addRuleSet(Digester.java:1663)
 at org.apache.commons.digester.xmlrules.FromXmlRuleSet.addRuleInstances(FromXmlRuleSet.java:145)
 at org.apache.commons.digester.Digester.addRuleSet(Digester.java:1663)
 at org.apache.commons.digester.xmlrules.DigesterLoader.createDigester(DigesterLoader.java:91)

I am not able to figure out why this is happening. But I did notice that "commons-digester.jar" is also bundled with "jbossweb-tomcat50.sar".

Files :

Service.java

package digesterloadertest;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import org.apache.commons.digester.Digester;
import org.apache.commons.digester.xmlrules.DigesterLoader;

public class Service {

 public void setName(String name) {
 System.out.println("Setting name : " + name);
 }

 public void add(String name, String type) {
 System.out.println("Adding name : [" + name + "], type : [" + type + "]");
 }

 public static void main(String[] args) throws Exception {
 Digester digester = DigesterLoader.createDigester(new File("config/digester_rules.xml").toURL());
 digester.setUseContextClassLoader(true);

 InputStream inStream = new FileInputStream("config/xml_for_digester.xml");

 digester.parse(inStream);

 }
}

JBossService.java

package digesterloadertest;

import java.io.InputStream;
import java.net.URL;

import org.apache.commons.digester.Digester;
import org.apache.commons.digester.xmlrules.DigesterLoader;
import org.jboss.system.ServiceMBeanSupport;

public class JBossService extends ServiceMBeanSupport implements JBossServiceMBean {

 public void startService() throws Exception {
 URL u = Thread.currentThread().getContextClassLoader().getResource("config/digester_rules.xml");
 Digester digester = DigesterLoader.createDigester(u);
 digester.setUseContextClassLoader(true);

 InputStream inStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("config/xml_for_digester.xml");

 digester.parse(inStream);
 }
}

JBossServiceMBean

package digesterloadertest;

import org.jboss.system.ServiceMBean;

public interface JBossServiceMBean extends ServiceMBean { }

config/digester_rules.xml

<?xml version="1.0"?>

<digester-rules>
 <object-create-rule pattern="service" classname="digesterloadertest.Service"/>
 <set-properties-rule pattern="service">
 <alias attr-name="name" prop-name="name" />
 </set-properties-rule>
 <call-method-rule pattern="service/sub-service" methodname="add" paramcount="2"/>
 <call-param-rule pattern="service/sub-service" paramnumber="0" attrname="name"/>
 <call-param-rule pattern="service/sub-service" paramnumber="1" attrname="type"/>
</digester-rules>

config/xml_for_digester.xml

<?xml version="1.0"?>

<service name="MyService">
 <sub-service name="SubService1" type="Any"/>
 <sub-service name="SubService2" type="Some"/>
 <sub-service name="SubService3" type="All"/>
</service>

Any help on this would be of great help.

Thanks