JSR 330 Annotations in Spring with example

Spring provides support for JSR 330 annotations since Spring 3.0. As spring annotations JSR 330 annotations are also working in the spring bean container. You just need to have the relevant jars in your classpath.

In pom.xml file add

<dependency>
    <groupId>javax.inject</groupId>
    <artifactId>javax.inject</artifactId>
    <version>1</version>
</dependency>

JSR 330 annotations (Dependency Injection):

• Also known as @Inject
• Joint JCP effort bu Google and SpringSource
• Standardizes internal DI annotations
• Published late 2009

Dependency Injection with @Inject and @Named

Instead of @Autowired, @javax.inject.Inject may be used as follows:

import javax.inject.Inject;
import javax.inject.Named;
@Named
public class TransferServiceImpl implements TransferService{

    @Inject
    public void TransferServiceImpl(@Named("accountRepository") AccountRepository accountRepository ) {
        this.accountRepository = accountRepository ;
    }

 }


import javax.inject.Named;

@Named("accountRepository")
public class JdbcAccountRepository implements AccountRepository {
//...
}

• As with @Autowired, it is possible to use @Inject at the field level, method level and constructor-argument level.
• As with @Component, it is possible to use @Named at the class level for component scanning by @ComponentScan
• If you would like to use a qualified name for the dependency that should be injected, you should use the @Named annotation as with @Qualifier.

Note: In contrast to @Component, the JSR-330 @Named annotation are not composable. Please use Spring’s stereotype model for building custom component annotations.

From @Autowired to @Inject