How Camunda works with Spring Boot

Camunda 7 Topics Discussion & Questions
1

Hello. I trying to create SPA with Spring Boot and Camunda.
I use Camunda starter dependency. I can easily start my process by using RuntimeService, but how can I manage tasks without Cockpit? I want to DemoDelegate do some stuff and then I don’t have to open Cockpit and press " complete" button on task. I tried to use TaskService, but somehow Spring injects null in taskService variable. Need your help. Here is some code:

@SpringBootApplication
@EnableResourceServer
@EnableProcessApplication
public class Main extends SpringBootServletInitializer {

    @Autowired
    private RuntimeService runtimeService;

    public static void main (String[] args) {
        SpringApplication.run(Main.class, args);
    }

    @Override
    protected SpringApplicationBuilder configure (SpringApplicationBuilder application) {
        return application.sources(Main.class);
    }

    @EventListener
    private void processPostDeploy(PostDeployEvent event) {
        runtimeService.startProcessInstanceByKey("Process_1uro4y5");
    }


}

@Component
public class DemoDelegate implements JavaDelegate {

    TaskService taskService;
    @Autowired
    public void setTaskService (TaskService taskService) {
        this.taskService = taskService;
    }

    @Override
    public void execute (DelegateExecution execution) throws Exception {
        System.out.println("First task");
        taskService.claim("Activity_1m1jmwo", "demo"); // nullPointer
// some logic here
        taskService.complete("Activity_1m1jmwo"); 
    }
}
2

Seems like in your BPMN-servictask you are not using delegateExpression but class to reference your vode. Could you double check this?
Background: class uses free reflection/default constructor. (Which is another good reason to prefer constructor injection -> fail fast)

3