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What are different ways to configure a class as Spring Bean?

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There are three different ways to configure Spring Bean.

XML Configuration: This is the most popular configuration and we can use bean element in context file to configure a Spring Bean. For example:

<bean name="myBean" class="com.journaldev.spring.beans.MyBean"></bean>

Java Based Configuration: If you are using only annotations, you can configure a Spring bean using @Bean annotation. This annotation is used with @Configuration classes to configure a spring bean. Sample configuration is:

@Configuration

@ComponentScan(value="com.journaldev.spring.main")

public class MyConfiguration {

@Bean

public MyService getService(){

return new MyService();

}

}

To get this bean from spring context, we need to use following code snippet:

AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(

MyConfiguration.class);

MyService service = ctx.getBean(MyService.class);

Annotation Based Configuration: We can also use @Component, @Service, @Repository and @Controller annotations with classes to configure them to be as spring bean. For these, we would need to provide base package location to scan for these classes. For example:

<context:component-scan base-package="com.journaldev.spring" />

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