How to name @Component from properties file?

Question

I am using spring. I know how to use properties data inside a class but I need to know how to give component name from the properties file.

@Component("componentName") // here I need to give my property instead of "componentName".
public class TestClass {

}

I do search abt it but not able to find sos! Please help me...

I'm not quite sure why you want to do this, could you clarify? — Jeroen Steenbeeke, Nov 27 '17 at 08:32
I think you can find answer here: https://stackoverflow.com/questions/7812745/spring-qualifier-and-property-placeholder — akhambir, Nov 27 '17 at 08:35
for reusability for next projects.We can easily change the prop name in future. — Mohanraj, Nov 27 '17 at 10:46

score 4 · Accepted Answer · answered Nov 27 '17 at 08:34

4

I'm afraid that is not possible. All names that is given to @Controller, @Service and so on requires to be final/constant.

answered Nov 27 '17 at 08:34

vegaasen

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16

Yes finally got to know its not possible. – Mohanraj Jan 08 '18 at 10:55

eis · Answer 2 · 2017-11-27T09:07:47.737

If you can use additional XML config, use alias directive as explained in this other question:

<beans>
    <alias name="${service.class}" alias="Service"/>
    <context:property-placeholder location="example/app.properties"/>
    <context:component-scan base-package="example"/>
<beans>

If you need to use java config only, there's an open issue about it here. It is still unresolved, so for strictly java config the same is not currently possible.

If that's a problem, you can also register a bean programmatically as detailed here. So you'd autowire a property and your target bean, implement BeanDefinitionRegistryPostProcessor and register your bean in the registry you get as a parameter using your property.

score 0 · Answer 3 · answered Nov 27 '17 at 08:47

I'm not sure if I understand correctly, from Spring 3 or up, you can use @PropertySource annotation to externalize your configuration to a properties file. And then display the values with @Value

If you are talking about distinguishing configuration beans, @Qualifier is the thing you are looking for

How to name @Component from properties file?

3 Answers3