Springboot using @Autowired on constructor with parameter

Question

I'm using springboot 1.3.8 and I have a @Autowired on a constructor with parameters but I get the error: No default constructor found...

@SpringBootApplication
public class App implements CommandLineRunner {

  private ApplicationContext context;
  private CLIHelper cliHelper;

  @Autowired
  public App(ApplicationContext context, CLIHelper cliHelper) {
    this.context = context;
    this.cliHelper = cliHelper;
  }

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

Answer is in your message. No default constructor i.e. public App() {...} available. Why don't you use @Autowired on fields? — lrother
– lrother, Commented Jun 2, 2017 at 12:17
Irother, I´d like to have a constructor with parameter to test some functionality. Some like this: Autowired private ApplicationContext context; Autowired private CLIHelper cliHelper; App app= new App(context, cliHelper); app.someMethods() — Juan Reina Pascual
– Juan Reina Pascual, Commented Jun 2, 2017 at 12:33

Sergii Bishyr · Accepted Answer · 2017-06-02 13:26:15Z

7

Your class is annotated with @SpringBootApplication which is also @Configuration. And @Configuration should have a default no-args constructor. From javadoc:

@Configuration classes must have a default/no-arg constructor and may not use @Autowired constructor parameters.

Since Spring version 4.3 you can have constructor injection for @Configuration class. Tested on Spring Boot version 1.5.3 and it works fine.

Here are the release notes for Spring 4.3. And here is the feature that you need:

@Configuration classes support constructor injection.

edited Jun 2, 2017 at 13:26

answered Jun 2, 2017 at 13:12

Sergii Bishyr

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