Spring instantiating object with @Value

Question

In my application.properties has the algumaCoisa=joao, and when I spin the java -jar nomedo.jar, it comes null, someone can explain to me why this happens and how I arrange?

@Component
class TesteClass{
    @Value("${algumaCoisa}")
    String nome

    String nomeDoValue
    String sobrenome

    TesteClass(info){

        this.nomeDoValue = nome
        this.sobrenome = info.sobrenome
    }
}

@Service
class AlgumService{
    //...
    for(i = 0; i < 3; i++){
        def objeto = new TesteClass(info)
        //...
    }
    //...
}

Answer 1

Point the location of the properties file to spring use in its class:

@Component
@PropertySource("classpath:/config.properties}")
class TesteClass{
    @Value("${algumaCoisa}")
    String nome

    String nomeDoValue
    String sobrenome

    TesteClass(info){

        this.nomeDoValue = nome
        this.sobrenome = info.sobrenome
    }
}

Follow spring documentation on the subject:

https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html