FEEL Expression in Output Entry

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Bernd Rücker

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Mar 9, 2016, 4:39:56 AM3/9/16
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Hey guys.

 

It is currently not possible to use FEEL to easily create a list of results in one output entry – correct (see example below – results in the exception shown below). It sounds that it SHOULD be possible according to the FEEL specification – or what do you think? In this case it is a feature request?

 

Thanks

Bernd

 

 

    <decision id="test" name="Test">

        <decisionTable id="decisionTable">

            <input id="input1" label="True">

                <inputExpression id="inputExpression1" typeRef="boolean">

                    <text>test.isTrue()</text>

                </inputExpression>

            </input>

            <output id="output1" label="Answer" name="answer" />

            <rule id="row-305433060-1">

                <inputEntry id="UnaryTests_0yemjku">

                    <text>true</text>

                </inputEntry>

                <outputEntry id="LiteralExpression_1ae1hqv"

                    expressionLanguage="feel">

                    <text><![CDATA["x", "y"]]></text>

                </outputEntry>

            </rule>

        </decisionTable>

    </decision>

 

Caused by: java.lang.UnsupportedOperationException: FEEL-01016 Simple Expression not supported by FEEL engine

    at org.camunda.bpm.dmn.feel.impl.juel.FeelEngineLogger.simpleExpressionNotSupported(FeelEngineLogger.java:157) ~[camunda-engine-feel-juel-7.4.0.jar:7.4.0]

    at org.camunda.bpm.dmn.feel.impl.juel.FeelEngineImpl.evaluateSimpleExpression(FeelEngineImpl.java:41) ~[camunda-engine-feel-juel-7.4.0.jar:7.4.0]

    at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateFeelSimpleExpression(DefaultDmnDecisionContext.java:276) ~[camunda-engine-dmn-7.4.0.jar:7.4.0]

    at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateOutputEntry(DefaultDmnDecisionContext.java:266) ~[camunda-engine-dmn-7.4.0.jar:7.4.0]

    at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateOutputEntries(DefaultDmnDecisionContext.java:245) ~[camunda-engine-dmn-7.4.0.jar:7.4.0]

    at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateMatchingRule(DefaultDmnDecisionContext.java:164) ~[camunda-engine-dmn-7.4.0.jar:7.4.0]

    at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.setEvaluationOutput(DefaultDmnDecisionContext.java:156) ~[camunda-engine-dmn-7.4.0.jar:7.4.0]

    at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateDecisionTable(DefaultDmnDecisionContext.java:103) ~[camunda-engine-dmn-7.4.0.jar:7.4.0]

    at org.camunda.bpm.dmn.engine.impl.DefaultDmnEngine.evaluateDecisionTable(DefaultDmnEngine.java:95) ~[camunda-engine-dmn-7.4.0.jar:7.4.0]

    at org.camunda.bpm.engine.impl.dmn.invocation.DecisionTableInvocation.invoke(DecisionTableInvocation.java:52) ~[camunda-engine-7.4.0.jar:7.4.0]

    at org.camunda.bpm.engine.impl.delegate.DelegateInvocation.proceed(DelegateInvocation.java:54) ~[camunda-engine-7.4.0.jar:7.4.0]

    at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocationInContext(DefaultDelegateInterceptor.java:86) ~[camunda-engine-7.4.0.jar:7.4.0]

    at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocation(DefaultDelegateInterceptor.java:58) ~[camunda-engine-7.4.0.jar:7.4.0]

    at org.camunda.bpm.engine.impl.util.DecisionTableUtil.invoke(DecisionTableUtil.java:86) ~[camunda-engine-7.4.0.jar:7.4.0]

    at org.camunda.bpm.engine.impl.util.DecisionTableUtil.evaluateDecisionTable(DecisionTableUtil.java:81) ~[camunda-engine-7.4.0.jar:7.4.0]

 

Bernd Rücker

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Mar 9, 2016, 4:41:11 AM3/9/16
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Attached the DMN Table

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test.dmn

Sebastian Menski

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Mar 9, 2016, 4:44:26 AM3/9/16
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Hi Bernd,

as you can read in the documentation [1] Camunda only supports FEEL for input entries. So the feature request would be to support FEEL also for other expressions.

Cheers,
Sebastian

Bernd Rücker

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Mar 9, 2016, 4:47:26 AM3/9/16
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But what I have just sent as an example would be valid DMN 1.1 – correct?

 

And it would be a nice addition to mention this limitation also here: https://docs.camunda.org/manual/7.4/reference/dmn11/decision-table/rule/#expression-language-of-an-output-entry

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Sebastian Menski

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Mar 9, 2016, 5:08:15 AM3/9/16
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Hi Bernd,

actually if I look at the FEEL grammar I don't think that you can create a list. In 9.4.3 we have: "Each output entry SHALL be a simple expression (grammar rule 5)."

And rule 5 states: "simple expression = arithmetic expression | simple value | comparison ; "
And a simple value is: "19 simple value = qualified name | simple literal ;"
And s simple literal is: "33 simple literal = numeric literal | string literal | Boolean literal | date time literal ;"

So no lists so far. Why do you think that list are valid? Sorry if I overlooked something. I not quite sure what is possible with FEEL in output entries.

Cheers,
Sebastian

Sebastian Menski

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Mar 9, 2016, 5:26:31 AM3/9/16
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Hi Bernd,

my last post seems to only be valid for S-FEEL. For real FEEL we found the sentence "An output entry is an expression." on page 135. And an expression can be a boxed expression. And a boxed expression can be a list.
So yes you are right your example seems to be valid. Sorry.

Cheers,
Sebastian

Bernd Rücker

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Mar 9, 2016, 10:10:19 AM3/9/16
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Hi Sebastian.

 

Thanks for looking into that in detail! I was indeed unsure if possible, but tended to believe it IS possible (but I am actually not “the grammer guy” ;-)). I put it on the DMN backlog.

 

Cheers

Bernd

 

Von: camunda-...@googlegroups.com [mailto:camunda-...@googlegroups.com] Im Auftrag von Sebastian Menski


Gesendet: Mittwoch, 9. März 2016 11:27
An: camunda BPM users <camunda-...@googlegroups.com>

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