ExecuteException: MethodExpression.interpret when referencing Entity EJB

[loleary]

I am struggling with a very strange Byteman exception that I just can't understand. My rule is simple but I have to use a custom helper method so that I can extract the specific elements from a Map:

RULE trace EventManagerBean addEventData events map
CLASS org.rhq.enterprise.server.event.EventManagerBean
METHOD addEventData
HELPER helpers.EventsHelper
AT ENTRY
IF TRUE
DO traceEventMap($1)
ENDRULE

$1 will be of type Map<EventSource, Set<Event>>. The helper class:

package helpers;

import java.util.Map;
import java.util.Set;

import org.jboss.byteman.rule.Rule;
import org.jboss.byteman.rule.helper.Helper;
import org.rhq.core.domain.event.Event;
import org.rhq.core.domain.event.EventSource;
import org.rhq.core.domain.resource.Resource;

public class EventsHelper extends Helper {

    protected EventsHelper(Rule rule) {
        super(rule);
    }

    public boolean traceEventMap(Map events) {
        Resource res = new Resource(12345);
        return traceln("I am returning...");
    }

}

When the rule is triggered, the helper method fails and the following is all that is output:

Rule.execute called for trace EventManagerBean addEventData events map_0
org.jboss.byteman.agent.Transformer : Saving transformed bytes to /tmp/JBM/bmdump/helpers/EventsHelper_HelperAdapter_Interpreted_1.class
HelperManager.install for helper class helpers.EventsHelper
calling activated() for helper class helpers.EventsHelper
Default helper activated
calling installed(trace EventManagerBean addEventData events map) for helper classhelpers.EventsHelper
Installed rule using default helper : trace EventManagerBean addEventData events map
trace EventManagerBean addEventData events map execute()
trace EventManagerBean addEventData events map : org.jboss.byteman.rule.exception.ExecuteException: MethodExpression.interpret : exception invoking method traceEventMap file /tmp/JBM/rules/BZ1110277.btm line 24
caught ExecuteException

I have tracked this down to the line 19 of the EventsHelper.java. If I comment out the line that reads:

        Resource res = new Resource(12345);

The helper method returns just fine and the exception goes away.

Any thoughts on what is going on here? If I put this same code into a Main method and invoke it directly, all is fine.