ConfigurationProperties does not bind properties

Question

I want to bind my application.properties into a class automatically by using @ConfigurationProperties annotation. First, I tried with @Value annotation and was able to inject pr

Answer 1

The main problem is that you do not have setters. When you put setters to ConfigBuilder works fine. The ConfigBuilder must be like this

@Component
@ConfigurationProperties(prefix="my")
public class ConfigBinder {

    private String name;

    private String url;

    // Getters and Setters !!!
}

Answer 2

You need to remove @Component from you properties class and add setters because standard bean property binding is used by @ConfigurationProperties:

@ConfigurationProperties(prefix="my")
public class ConfigBinder {

    private String name;

    private String url; // expected to be filled automatically

    public String getUrl() {
        return this.url;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setUrl(String url) {
        this.url = url;
    }
}

And add @EnableConfigurationProperties to your main class:

@SpringBootApplication
@EnableConfigurationProperties(ConfigBinder.class)
public class Application {

    public static void main(String[] args) {
        final ApplicationContext ctx = SpringApplication.run(Application.class, args);
        final ConfigBinder confs = ctx.getBean(ConfigBinder.class);
        System.out.println(confs.getUrl());
        System.out.println(confs.getName());
    }

}