Spring bean primitive properties when using @Component and @Autowired?

Question

How to set value for primitive properties of a bean?

Since we have @Component annotation and also @Autowired annotation also is for binding instance dependencies, so what about primitive properties?

@Component
class Person{
@Autowired
Address address;

int age /// what about this one?
}

Answer 1

For primitives you can use the @Value annotation. The usual scenario is to have a PropertyPlaceholderConfigurer which has loaded the values from a properties file, and then have @Value("${property.key}")

You can also define your values as beans, which is more old-school:

<bean id="foo" class="java.lang.Integer" factory-method="valueOf">
    <constructor-arg value="20" />
</bean>

and then

@Autowired
@Qualifier("foo")
private int foo;