🍃🎓 SPRING CERTIFICATION QUESTION: Which are valid ways ...

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🍃🎓 SPRING CERTIFICATION QUESTION: Which are valid ways to load external properties in Spring?

· java,spring

Which are valid ways to load external properties in Spring?

Using @PropertySource annotation

Using @Property annotation

Using @Value annotation

Using @Env annotation

Answer:

✅ You can load external properties with @PropertySource .

Ex:

@Configuration
@PropertySource("classpath:/com/organization/config/app.properties")
@PropertySource("file:config/local.properties")
public class ApplicationConfig {
     // ...
}

✅ You can also load external properties with @Value .

Ex:

@Configuration
public class DbConfig {
    @Bean
    public DataSource dataSource {
    // convenient alternative to explicitly using Environment bean
    @Value("$(db.driver") String driver,
    @Value("$(db.url") String URL,
    @Value("$(db.user") String user,
    @Value("$(db.password") String pwd) {
        BasicDataSource ds = new BasicDataSource();
        ds.setDriverClassName( driver );
        ds.setUrl(url);
        ds.setUser(user);
        ds.setPassword(pwd);
        return ds;
    }
}

❌ There is no such @Env annotation but usually, you load the environment with @Autowired:

@Autowired
private Environment env;

❌ Property is not an annotation, it is a class used to handle beans properties:

Person person = new Person();
person.setName("John");
Property nameProperty = PropertyAccessorFactory.forBeanPropertyAccess(person)
     .getProperty("name");
System.out.println("Name: " + nameProperty.getValue());

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