Spring @Qualifier Annotation

So for avoid this type problem we can use the one more annotation @Qualifier along with the @Autowired annotation remove the confusion by specifying which exact bean will be wired. 
 Below is an example to show the use of @Qualifier annotation.

Circle.java

package com.dineshonjava.sdnext.autowiredannotation.tutorial;

import org.springframework.beans.factory.annotation.Autowired;

public class Circle
{ 
 private Point center;
 //using autowired annotation with setter method
//using qualifier annotation for exact bean will be wired
 @Autowired
 @Qualifier("circleBean")
 public void setCenter(Point center) 
 {
    this.center = center;
 }

 public void draw() 
 {
System.out.println("Circle is drawn of center ("+center.getX()+", "+center.getY()+")");
 }
}

Point.java

package com.dineshonjava.sdnext.autowiredannotation.tutorial;

public class Point
{
 private int x;
 private int y;
 /**
  * @return the x
  */
 public int getX() {
  return x;
 }
 /**
  * @param x the x to set
  */
 public void setX(int x) {
  this.x = x;
 }
 /**
  * @return the y
  */
 public int getY() {
    return y;
 }
 /**
  * @param y the y to set
  */
 public void setY(int y) {
           this.y = y;
 }
}

DrawingApp.java

package com.dineshonjava.sdnext.autowiredannotation.tutorial;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author Dinesh Rajput
 *
 */
public class DrawingApp
{
 /**
  * @param args
  */
 public static void main(String[] args) 
 {
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Circle circle = (Circle) context.getBean("circle");
circle.draw();
 }
}

spring.xml

<beans xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:>
Once you are done with creating source and bean configuration files, let us run the application. If everything is fine with your application, this will print the following message:


Output:
Jul 11, 2012 11:23:36 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@ab50cd: startup date [Wed Jul 11 23:23:36 IST 2012]; root of context hierarchy
Jul 11, 2012 11:23:36 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [spring.xml]
Jul 11, 2012 11:23:36 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@bd928a: defining beans [circle,pointA,pointB,pointC,center,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor#0]; root of factory hierarchy
Circle is drawn of center (0, 0)