How to configure spring-boot with swing application

Question

I'd like using spring-boot-starter-data-jpa features to create a non-web aplication. In the 52.4 documentation says:

Application code that you want to run as your business logic can be implemented as a CommandLineRunner and dropped into the context as a @Bean definition.

My AppPrincipalFrame looks like:

@Component public class AppPrincipalFrame extends JFrame implements CommandLineRunner{  private JPanel contentPane;  @Override public void run(String... arg0) throws Exception {     EventQueue.invokeLater(new Runnable() {         public void run() {             try {                 AppPrincipalFrame frame = new AppPrincipalFrame();                 frame.setVisible(true);             } catch (Exception e) {                 e.printStackTrace();             }         }     }); } 

And boot application class looks like:

@Configuration @ComponentScan @EnableAutoConfiguration public class Application {     public static void main(String[] args) {    ApplicationContext context = SpringApplication.run(Application.class, args);    AppPrincipalFrame appFrame = context.getBean(AppPrincipalFrame.class);   } } 

But does not work. Anybody have a sample about this?

Edited and exception added.

Exception in thread "main" org.springframework.beans.factory.BeanCreationException:      Error creating bean with name 'appPrincipalFrame'.  Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [es.adama.swing.ui.AppPrincipalFrame]: Constructor threw exception; nested exception is java.awt.HeadlessException  

Regards.

Answer 1

It's been a while since you posted the question, but I run out with the same problem in a old project that I'm migrating and figured a different way, I think that more clear, to make the things work.

Instead of using SpringApplication.run(Application.class, args); you can use: new SpringApplicationBuilder(Main.class).headless(false).run(args); and it isn't necessary to make toy Application class extends from JFrame. Therefore the code could look like:

@Configuration @ComponentScan @EnableAutoConfiguration public class Application {       public static void main(String[] args) {     ConfigurableApplicationContext context = new SpringApplicationBuilder(Application.class).headless(false).run(args);     AppPrincipalFrame appFrame = context.getBean(AppPrincipalFrame.class); } 

Answer 2

The Swing application must be placed on the Swing Event Queue. Not doing so is a serious mistake.

So the correct way to do it:

public static void main(String[] args) {      ConfigurableApplicationContext ctx = new SpringApplicationBuilder(SwingApp.class)             .headless(false).run(args);      EventQueue.invokeLater(() -> {         SwingApp ex = ctx.getBean(SwingApp.class);         ex.setVisible(true);     }); } 

In addition, we can just use the @SpringBootApplication annotation.

@SpringBootApplication public class SwingApp extends JFrame { 

See my Spring Boot Swing integration tutorial for a full working example.