example-dmn-rest

Spring Boot Web application with embedded Camunda engine

This example demonstrates how you can build Spring Boot Web application having following configured:

• Embedded Camunda engine accessible via REST
• Process application and one Decision Definition deployed

How is it done

1. To embed the Camunda Engine accessible via REST API you must add following dependency to your pom.xml:

...
<dependency>
  <groupId>org.camunda.bpm.springboot</groupId>
  <artifactId>camunda-bpm-spring-boot-starter-rest</artifactId>
  <version>7.16.0</version>
</dependency>
...

2. With Spring Boot you usually create an "application" class annotated with @SpringBootApplication. In order to have the Camunda process application registered, you can simply add an annotation @EnableProcessApplication to the same class and also include processes.xml file to your META-INF folder:

@SpringBootApplication
public class DmnRestApplication {

  public static void main(final String... args) throws Exception {
    SpringApplication.run(RestApplication.class, args);
  }

}

3. You can also put BPMN, CMMN and DMN files in your classpath, they will be automatically deployed and registered within a process application.

This example deploys a decision definition.

Run the application and call the REST API

You can then build the application with mvn clean install and then run it with java -jar command.

Then you can access REST API in browser: http://localhost:8080/engine-rest/decision-definition - this will show you the deployed decision definition.

In order to evaluate a decision, execute the following:

POST http://localhost:8080/engine-rest/decision-definition/key/checkOrder/evaluate

{
  "variables" : {
    "sum" : { "value" : 1100, "type" : "Double" },
    "status" : { "value" : "silver", "type" : "String" }
  }
}

Or have a look at the JUnit test in the project.