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

Spring JSR 330 Comments
@Autowired
@Inject
@Inject always mandatory, has no ‘required’ attribute.
@Component
@Named
Spring also scan for @Named .
@Scope @Scope JSR 330 Scope for ,eta annotation and injection point only
@Scope(“singleton”)
@Singleton
JSR-330 default scope is like Spring’s prototype.
@Qualifier
@Named
@Value
No equivalent SpEL specific
@Required
Redundant @Inject always required
@Lazy
No equivalent Useful when needed, often abused

 

Spring Related Topics you may like

 

Previous
Next
Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!

Share
Published by
Dinesh Rajput

Recent Posts

Strategy Design Patterns using Lambda

Strategy Design Patterns We can easily create a strategy design pattern using lambda. To implement…

2 years ago

Decorator Pattern using Lambda

Decorator Pattern A decorator pattern allows a user to add new functionality to an existing…

2 years ago

Delegating pattern using lambda

Delegating pattern In software engineering, the delegation pattern is an object-oriented design pattern that allows…

2 years ago

Spring Vs Django- Know The Difference Between The Two

Technology has emerged a lot in the last decade, and now we have artificial intelligence;…

2 years ago

TOP 20 MongoDB INTERVIEW QUESTIONS 2022

Managing a database is becoming increasingly complex now due to the vast amount of data…

2 years ago

Scheduler @Scheduled Annotation Spring Boot

Overview In this article, we will explore Spring Scheduler how we could use it by…

3 years ago