Replacing Spring bean injection via XML with annotation injection

Question

I want to declare and inject a bean through annotations. It was previously done through XML, but I need to apply on a Spring Boot project.

Here is the source xml

<oauth:resource-details-service id="rds"> <oauth:resource id="oauth1" key="${key}" secret="${secret}" request-token-url="${token}" user-authorization-url="${user-auth}" access-token-url="${accesstokenurl}"> </oauth:resource> </oauth:resource-details-service>

The bean was later used like this

<bean class="org.springframework.security.oauth.consumer.client.OAuthRestTemplate"> <constructor-arg ref="oauth1"/> </bean>

The only way I found is through direct instantiation

BaseProtectedResourceDetails resourceDetails = new BaseProtectedResourceDetails(); resourceDetails.set... resourceDetails.set... OAuthRestTemplate restTemplate = new OAuthRestTemplate(resourceDetails);

What would be the proper way to do this?

You can initialize BaseProtectedResourceDetails in your configuration java class and then initialize bean for OAuthRestTemplate and pass the initialized bean of BaseProtectedResourceDetails in constructor. — Naman Gala
– Naman Gala, Commented Feb 19, 2015 at 4:50

tcharaf · Accepted Answer · 2015-02-19 09:59:40Z

you can use @Bean annotation in your main class for example:

@SpringBootApplication public class Application{ @Bean public OAuthRestTemplate getAuth(){ BaseProtectedResourceDetails resourceDetails = new BaseProtectedResourceDetails(); resourceDetails.set... resourceDetails.set... return new OAuthRestTemplate(resourceDetails); } }

and after use @Autowired to inject the object

@Autowired private OAuthRestTemplate oAuthRestTemplate;

What if the resourceDetails needs configuration defined in a property file (like a secret key), having a field annotated with @Value could be work or would it be empty when the bean is created?
you can try to use Environment object like this : @Resource Environment env; and get property like : final String myPropertyValue = environment.getProperty("myProperty");

Community · Accepted Answer · 2017-05-23 12:12:40Z

I am not sure you are searching for this explanation. But if I understand you question then following information may help you.

For Sample configuration class you can see this example.

package com.tutorialspoint; import org.springframework.context.annotation.*; @Configuration public class TextEditorConfig { @Bean public TextEditor textEditor(){ return new TextEditor( spellChecker() ); } @Bean public SpellChecker spellChecker(){ return new SpellChecker( ); } }

And for registering configuration class, you can see this SO answer.

See this for @Service, @Component, @Repository, @Controller, @Autowired related example.

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