[rules-users] ForEach element cannot see CollectionExpression

[sam.squire at paretopartners.com]

Hello there,

I am experimenting with Drools. I seem to be having problems with making 
the ForEach element to work. It cannot 'see' the mappings created when I 
start the process. I am hand coding the XML flow files and using the 
schema (and documentation) to help me.

The problem seems to be in the flow file before the rule file is even 
executed. Is this the correct way to pass a collection to the process?

// the collection to iterate over
Collection<BusinessObject> pending = new ArrayList<BusinessObject>();
pending.add(new BusinessObject());
pending.add(new BusinessObject());

// the parameters for the process
Map<String, Object> params = new HashMap<String, Object>();
params.put("pending", pending);

ksession.startProcess("org.processor", params);
ksession.fireAllRules();

In the rule file, I have:
        <forEach id="2" name="processor" variableName="current" 
collectionExpression="pending" > 
                <in-ports>
                        <in-port type="DROOLS_DEFAULT" nodeId="6" 
nodeInType="DROOLS_DEFAULT" /> 
                </in-ports>
                <out-ports>
                        <out-port type="DROOLS_DEFAULT" nodeId="8" 
nodeOutType="DROOLS_DEFAULT" /> 
                </out-ports>

        <nodes>
                <start id="6" name="test" />

                <actionNode id="7">
                <action type="expression" dialect="mvel">
                        System.out.println(current);
                </action>
                </actionNode>

                <end id="8" name="done"/>

        </nodes>

                <connections>
                        <connection from="6" to="7" />
                        <connection from="7" to="8" />
                </connections>

        </forEach>


I cannot tell if the scope inside the ForEach > nodes is separate from the 
outer-scope, can I use the same IDs?

The error I receive:
Exception in thread "main" java.lang.IllegalArgumentException: Could not 
find collection params



What am I doing wrong?

Regards,
S. Squire


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