I have a POJO class where the class variables are getting injected by `@Value` annotation. I am trying to validate my class variables using javax validation api & so I have tried `@NotNull`, `@NotEmpty` and `@NotBlank`, but all of them seem not to be validating or throwing any kind of exception even when a blank/null value is present in the application.yml file. Any idea as to how can I validate my POJO here using the javax validation api?
PS: I am using lombok to generate my getter/setter.

Below is my sample code!

**POJO Class:**

```
@Component
@Getter
@Setter
public class Credentials {

    @NotBlank
    @Value("${app.username}")
    private String user_name;

    @NotBlank
    @Value("${app.password}")
    private String password;

}

```

Below is the application.yml file:

```
app:
    username: '#{null}'
    password: passWord

```

Even if I provide a blank value, I don't get any exception when I try to print these values in the console.