Spring Boot: exception while exiting application

Question

I want to run a Spring application that should exit after it has done its work. But in my implementation I get an exception.

build.gradle contains:

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web") {
        exclude module: "spring-boot-starter-tomcat"
    }
}

Application.java:

@SpringBootApplication
public class Application {

    @Autowired
    private ApplicationContext context;

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

    @PostConstruct
    public void doTheWorkAndExit() {
        // do the work ...
        SpringApplication.exit(context, () -> 0);
    }

}

I get the exception

Exception thrown from LifecycleProcessor on context close

java.lang.IllegalStateException: LifecycleProcessor not initialized - call 'refresh' before invoking lifecycle methods via the context: org.springframework.context.annotation.AnnotationConfigAppl
icationContext@1807f5a7: startup date [Fri Mar 11 10:03:27 CET 2016]; root of context hierarchy
    at org.springframework.context.support.AbstractApplicationContext.getLifecycleProcessor(AbstractApplicationContext.java:415)
    at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:975)
    at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:934)
    at org.springframework.boot.SpringApplication.close(SpringApplication.java:1252)
    at org.springframework.boot.SpringApplication.exit(SpringApplication.java:1238)
    at mypackage.Application.doTheWorkAndExit(Application.java:34)
    ...

What can I do? Is there a better solution than using System.exit(0)?

Answer 1

In your Application.class you can implement CommandLineRunner interface.

@SpringBootApplication
public class Application implements CommandLineRunner{}

After implementation you need to implement a void method run()

@Override
public void run(String... strings) {
    //here starts your code (like in a normal main method in a java application)
}

The application shuts down after excecuting all of the code.

---

The complete Application.class:

@SpringBootApplication
public class Application implements CommandLineRunner{

  @Override
  public void run(String... strings) {
      //here your code...
  }

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