[jboss-user] [jBPM] - Re: JBPM5 EL Expression

[Donald Walters]

Donald Walters [http://community.jboss.org/people/dondragon2] created the discussion

"Re: JBPM5 EL Expression"

To view the discussion, visit: http://community.jboss.org/message/623342#623342

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Hi Maciej,

Based on your advice above I was able to make an implementation. This only works for condition expressions at the moment. But, I have been having an issue with the registration and usage of the dialect.

below is how I register it. This is done just before creating the KnoledgeBase
ProcessDialectRegistry.setDialect("jexl", new ELProcessDialect());

The xml is as follows:
<sequenceFlow id="case15" sourceRef="decision8" targetRef="prompt9">
            <conditionExpression xsi:type="tFormalExpression" language="jexl"> ${response['resultSet'] != null &amp;&amp; response['resultSet'][0][0] &gt; 0}      </conditionExpression>
</sequenceFlow>

But this does not work.

If do the following it works perfectly.
ProcessDialectRegistry.setDialect("mvel", new ELProcessDialect());

The xml is as follows:
<sequenceFlow id="case15" sourceRef="decision8" targetRef="prompt9">
            <conditionExpression xsi:type="tFormalExpression"> ${response['resultSet'] != null &amp;&amp; response['resultSet'][0][0] &gt; 0}      </conditionExpression>
</sequenceFlow>

I realize that from the core xml parser there are some checks for languages and anything other than java, xpath, rule then there is an exception.
With some assistance I would be able to make the correct implementation and also for node support.

Attached is source.
note: I used the Apache Commons JEXL 2.0.1 library
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