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  • Using context:component-scan to pick up @Configuration Classes

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    In Spring 3.0 using the tag context:component-scan in xml file, the entry of the class(or bean) defined under the scan tag is automatically created. The example to show use of context:component-scan tag is as below:

    Example:-

    JavaConfig.java

    package com.babita;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    
    @Configuration
    public class JavaConfig {
    
        public void printMessage()
        {
            System.out.println("Hello World From Spring 3.0");
        }
    }
    

    Now define the below code in app-context.xml

    <?xml version="1.0" encoding="UTF-8"?>
    
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    <context:component-scan base-package="com.babita"></context:component-scan>
       <context:annotation-config/>
    
    
    </beans>
    

    Now define the below class to run the code:

    MainApp.java

    package com.babita;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    import org.springframework.context.support.AbstractApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class MainApp {
    
        /**
         * @param args
         */
        public static void main(String[] args) {
            // TODO Auto-generated method stub
             //ApplicationContext context = new AnnotationConfigApplicationContext();
            ApplicationContext context =  new ClassPathXmlApplicationContext(new String[] {"app-context.xml"});
            JavaConfig obj = (JavaConfig) context.getBean("javaConfig");
            obj.printMessage();
    
        }
    
    }
    

    In Above example we can see that the @Configuration Class JavaConfig.java can be instantiate using the following tag in app-context.xml file.this class(or bean) entry is automatically created in the xml file.

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

    Hope this will help you :)

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