Add a JPA Entity

OrderEntity is a plain JPA entity representing a pizza order:

@Entity
public class OrderEntity implements Serializable {

  @Id
  @GeneratedValue
  protected Long id;

  @Version
  protected long version;

  protected String customer;
  protected String address;
  protected String pizza;
  protected boolean approved;

  // getters and setters ...
}

Add an EJB Service Bean

OrderBusinessLogic is a stateless session bean, exposed as a CDI bean via @Named so it can be invoked from a BPMN expression. persistOrder reads the process variables collected by the start form, persists a new OrderEntity, and stores its generated id as a new process variable:

@Stateless
@Named
public class OrderBusinessLogic {

  @PersistenceContext
  private EntityManager entityManager;

  public void persistOrder(DelegateExecution delegateExecution) {
    OrderEntity orderEntity = new OrderEntity();

    Map<String, Object> variables = delegateExecution.getVariables();

    orderEntity.setCustomer((String) variables.get("customer"));
    orderEntity.setAddress((String) variables.get("address"));
    orderEntity.setPizza((String) variables.get("pizza"));

    entityManager.persist(orderEntity);
    entityManager.flush();

    delegateExecution.removeVariables(variables.keySet());
    delegateExecution.setVariable("orderId", orderEntity.getId());
  }

}

Wire Up the Service Task

We replace the placeholder expression on the “Persist Order” service task with a real invocation of the EJB bean:

<bpmn:serviceTask id="ServiceTask_0lrmoed" name="Persist Order" camunda:expression="${orderBusinessLogic.persistOrder(execution)}">

Build and Deploy

Rebuild and redeploy the WAR file, then place another order - this time, the order is persisted to the database via the EJB service bean.