Decision Evaluate via REST with complex Object

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Bernd Rücker

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Jan 16, 2016, 4:53:51 AM1/16/16
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Hey guys.

 

I do a POST to http://localhost:8080/engine-rest/engine/default/decision-definition/key/notwendigeKompetenz/evaluate according to https://docs.camunda.org/manual/7.4/reference/rest/decision-definition/post-evaluate/

 

I want to hand over a Java Object to rule evaluation. So I do the same I would do when starting a process instance:

{

                "variables": {

                               "claim": {

                                               "value": "{\"type\":\"Unfall KFZ\",\"expenditure\":\"100\"}",

                                               "type": "Object",

                                               "valueInfo": {

                                                               "serializationDataFormat": "application/json",

                                                               "objectTypeName": "com.camunda.demo.dmntraining.taskrouting.Claim"

                                               }

                               }

                }

}

 

But it seems that in this case Spin is not used to deserialize the JSON to a Java Object?

 

I get this stack trace:

 

10:48:11,172 WARNING [ExceptionHandler] (default task-27) org.camunda.bpm.engine.rest.exception.RestException: Cannot evaluate decision notwendigeKompetenz:1:d6

        at org.camunda.bpm.engine.rest.sub.repository.impl.DecisionDefinitionResourceImpl.evaluateDecision(DecisionDefinitionResourceImpl.java:150)

 

…

 

Caused by: org.camunda.bpm.engine.ProcessEngineException: Exception while evaluating decision with id 'notwendigeKompetenz:1:d68b39e4-bc1d-11e5-a86f-984920524153'

        at org.camunda.bpm.engine.impl.dmn.cmd.EvaluateDecisionByIdCmd.doEvaluateDecision(EvaluateDecisionByIdCmd.java:70)

        at org.camunda.bpm.engine.impl.dmn.cmd.EvaluateDecisionByIdCmd.execute(EvaluateDecisionByIdCmd.java:61)

        at org.camunda.bpm.engine.impl.dmn.cmd.EvaluateDecisionByIdCmd.execute(EvaluateDecisionByIdCmd.java:38)

        at org.camunda.bpm.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)

        at org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:95)

        at org.camunda.bpm.engine.impl.interceptor.JtaTransactionInterceptor.execute(JtaTransactionInterceptor.java:58)

        at org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30)

        at org.camunda.bpm.engine.impl.DecisionServiceImpl.evaluateDecisionTable(DecisionServiceImpl.java:47)

        at org.camunda.bpm.engine.impl.DecisionServiceImpl.evaluateDecisionTableById(DecisionServiceImpl.java:34)

        at org.camunda.bpm.engine.rest.sub.repository.impl.DecisionDefinitionResourceImpl.evaluateDecision(DecisionDefinitionResourceImpl.java:133)

        ... 48 more

Caused by: org.camunda.bpm.dmn.engine.impl.DmnEvaluationException: DMN-01002 Unable to evaluate expression for language 'juel': '${claim.type}'

        at org.camunda.bpm.dmn.engine.impl.DmnEngineLogger.unableToEvaluateExpression(DmnEngineLogger.java:32)

        at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateElExpression(DefaultDmnDecisionContext.java:329)

        at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateExpression(DefaultDmnDecisionContext.java:297)

        at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateInputExpression(DefaultDmnDecisionContext.java:217)

        at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateInput(DefaultDmnDecisionContext.java:112)

        at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateDecisionTable(DefaultDmnDecisionContext.java:93)

        at org.camunda.bpm.dmn.engine.impl.DefaultDmnEngine.evaluateDecisionTable(DefaultDmnEngine.java:95)

        at org.camunda.bpm.engine.impl.dmn.invocation.DecisionTableInvocation.invoke(DecisionTableInvocation.java:52)

        at org.camunda.bpm.engine.impl.delegate.DelegateInvocation.proceed(DelegateInvocation.java:54)

        at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocationInContext(DefaultDelegateInterceptor.java:86)

        at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocation(DefaultDelegateInterceptor.java:58)

        at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor$1.call(DefaultDelegateInterceptor.java:52)

        at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor$1.call(DefaultDelegateInterceptor.java:49)

        at org.camunda.bpm.engine.impl.context.ProcessApplicationClassloaderInterceptor.call(ProcessApplicationClassloaderInterceptor.java:44)

        at org.camunda.bpm.application.AbstractProcessApplication.execute(AbstractProcessApplication.java:109)

        at org.camunda.bpm.engine.impl.context.Context.executeWithinProcessApplication(Context.java:186)

        at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocation(DefaultDelegateInterceptor.java:49)

        at org.camunda.bpm.engine.impl.util.DecisionTableUtil.invoke(DecisionTableUtil.java:86)

        at org.camunda.bpm.engine.impl.util.DecisionTableUtil.evaluateDecisionTable(DecisionTableUtil.java:81)

        at org.camunda.bpm.engine.impl.dmn.cmd.EvaluateDecisionByIdCmd.doEvaluateDecision(EvaluateDecisionByIdCmd.java:67)

        ... 57 more

Caused by: java.lang.IllegalStateException: Object is not deserialized.

        at org.camunda.bpm.engine.variable.impl.value.ObjectValueImpl.getValue(ObjectValueImpl.java:86)

        at org.camunda.bpm.engine.impl.el.VariableContextElResolver.unpack(VariableContextElResolver.java:73)

        at org.camunda.bpm.engine.impl.el.VariableContextElResolver.getValue(VariableContextElResolver.java:42)

        at org.camunda.bpm.engine.impl.javax.el.CompositeELResolver.getValue(CompositeELResolver.java:231)

        at org.camunda.bpm.engine.impl.juel.AstIdentifier.eval(AstIdentifier.java:81)

        at org.camunda.bpm.engine.impl.juel.AstProperty.eval(AstProperty.java:52)

        at org.camunda.bpm.engine.impl.juel.AstEval.eval(AstEval.java:50)

        at org.camunda.bpm.engine.impl.juel.AstNode.getValue(AstNode.java:26)

        at org.camunda.bpm.engine.impl.juel.TreeValueExpression.getValue(TreeValueExpression.java:114)

        at org.camunda.bpm.engine.impl.dmn.el.ProcessEngineElExpression.getValue(ProcessEngineElExpression.java:43)

        at org.camunda.bpm.dmn.engine.impl.DefaultDmnDecisionContext.evaluateElExpression(DefaultDmnDecisionContext.java:325)

        ... 75 more

 

My fault? Bug? Missing Feature?

 

Thanks and cheers

Bernd

Bernd Rücker

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Jan 19, 2016, 8:45:46 AM1/19/16
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Anybody?

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Sebastian Menski

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Jan 19, 2016, 11:44:52 AM1/19/16
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Hi Bernd,

as you didn't provided an example it took some time to reproduce. ;)

And also I wasn't able to reproduce it. 

And the request:
POST /engine-rest/process-definition/key/testProcess/start HTTP/1.1
Accept: application/json
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Length: 303
Content-Type: application/json
Host: localhost:8080
User-Agent: HTTPie/0.9.2

{
    "variables": {
        "claim": {
            "type": "Object", 
            "value": "{\"type\":\"Unfall\"}", 
            "valueInfo": {
                "objectTypeName": "org.camunda.bpm.example.Claim", 
                "serializationDataFormat": "application/json"
            }
        }
    }
}

HTTP/1.1 200 OK
Content-Type: application/json
Date: Tue, 19 Jan 2016 16:42:25 GMT
Server: Apache-Coyote/1.1
Transfer-Encoding: chunked

{
    "businessKey": null, 
    "caseInstanceId": null, 
    "definitionId": "testProcess:1:abb66746-bec9-11e5-8ebf-0242c1341b97", 
    "ended": true, 
    "id": "9ec50a4e-becb-11e5-aa10-0242c1341b97", 
    "links": [
        {
            "method": "GET", 
            "rel": "self"
        }
    ], 
    "suspended": false
}


I used latest tomcat 7.5.0-SNAPSHOT.

Does this example fail in your setup?

Cheers,
Sebastian

Bernd Rücker

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Jan 19, 2016, 11:48:58 AM1/19/16
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Great – thanks!

So I take this as „should work” and will investigate further. Thanks a lot! I basically wasn’t sure if it is supported and should work or not…

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