CODEWITHSUNDEEP
javaspringspring-boot
dertoni
dertoni

Reputation: 1803

Using @Value annotation in Spring Starter Class

I'm using Spring Boot to start an embedded Tomcat with my application in it. This Tomcat-Server is behind a firewall and for all connections to the outside world, I need to use a proxy with authentication.

For this reason I configured an Authenticator right before I start up the Spring Application in my main method.

Everything works fine with fixed Username/Password, but I would like to read these from a properties file, therefore I tried to inject these via

@Value("${proxy.user}")
private String proxyUser;
@Value("${proxy.password}")
private String proxyPassword;

But these always evaluate to null. I guess that's because the ApplicationContext and therefore the Spring Application does not exist, when the class with the main method is instantiated...

Is there a best practice for these kind of situation? Do I just read the properties in the "old-fashioned" way?

Class looks something like this:

@Configuration
@EnableAutoConfiguration
public class Application {

    @Value("${proxy.user}")
    private String proxyUser;
    @Value("${proxy.password}")
    private String proxyPassword;

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

    private void run() {
        ProxyAuthenticator proxyAuth = new ProxyAuthenticator(proxyUser, proxyPassword);
        Authenticator.setDefault(proxyAuth);

        // Spring Context starten
        ConfigurableApplicationContext context = SpringApplication.run(Application.class);
    }
}

Upvotes: 1

Views: 947

Answers (1)

M. Deinum
M. Deinum

Reputation: 124441

The problem is your main you aren't using Spring Boot you are just creating a new instance.

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

Now in your run method you are trying to use properties that haven't been initialized as it is just a new instance instead of a Spring configured instance.

You will need to start your application in the main method and afterwards you can configure the ProxyAuthenticator.

Upvotes: 2

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