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 prepareRefreshINFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@ab50cd: startup date [Wed Jul 11 23:23:36 IST 2012]; root of context hierarchyJul 11, 2012 11:23:36 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitionsINFO: Loading XML bean definitions from class path resource [spring.xml]Jul 11, 2012 11:23:36 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletonsINFO: 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 hierarchyCircle is drawn of center (0, 0)
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