Shared DMN usage if tenant DMN does not exists

BPMN & Modeling Discussion & Questions
1

Hi all,

we have integrated the DMN engine in our application and are using tenant mechanism.

In the case, where the default (DMN) should be used, following error is thrown:

org.camunda.bpm.engine.exception.dmn.DecisionDefinitionNotFoundException: no decision definition deployed with key ‘orderDecision’ and tenant-id ‘undefined’: decisionDefinition is null

Usage:

  DecisionsEvaluationBuilder decisionsEvaluationBuilder = rule.getDecisionService()
      .evaluateDecisionByKey(decisionDefinitionKey);

  if (tenant == null || tenant.isEmpty()) {
    decisionsEvaluationBuilder.decisionDefinitionWithoutTenantId();
  } else {
    decisionsEvaluationBuilder.decisionDefinitionTenantId(tenant);
  }

  DmnDecisionResult result = decisionsEvaluationBuilder.variables(variables).evaluate();

So I implemented the usage in that way, that first I search for the dmn definition and check, if a tenant specific definition exists. Based on that I use the tenant or default dmn definition for the evaluation.

If the DMN is integrated in an BPMN as business rule call, such workaround is not needed.

Is this a correct behavior?

BR Bernd

2

You need to deploy the dmn file twice, one with tenant-id and one without tenant-id.

3

In my unit test three dmn files are deployed.

private void deployTenantMocks() {
  this.rule.getRepositoryService()
    .createDeployment()
    .addClasspathResource("Example.dmn")
    .deploy();
  this.rule.getRepositoryService()
    .createDeployment()
    .tenantId("fintec1")
    .addClasspathResource("fintec1/Example.dmn")
    .deploy();
  this.rule.getRepositoryService()
    .createDeployment()
    .tenantId("fintec2")
    .addClasspathResource("fintec2/Example.dmn")
    .deploy();
}

I have provided the unit test in following gitlab repository:

Test-Output

Tests in error:
   evaluateDecisionWithUndefinedTenant(com.test.dmn.DecisionServiceTest): no decision definition deployed with key 'orderDecision' and tenant-id 'undefined': decisionDefinition is null