Basic spring issue : using #Autowired - spring

Question

I have the following 2 objects: User and DomainUser
User.java:
package com.domain;
import java.io.Serializable;
#SuppressWarnings("serial")
public class User implements Serializable {
private long id = 0;
private String userName;
private String password;
public User() {
}
public User(long id) {
this.id = id;
}
public String toString() {
StringBuffer sb = new StringBuffer(256);
sb.append("[id : ").append(id).append(", ");
sb.append("userName : ").append(userName).append(", ");
sb.append("password : ").append(password).append("]");
return sb.toString();
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
DomainUser.java
package com.domain;
import org.springframework.beans.factory.annotation.Autowired;
public class DomainUser {
#Autowired
private User user;
private String domainName;
public String toString() {
StringBuffer sb = new StringBuffer(255);
sb.append(user.toString()).append(", domainName : ").append(domainName);
return sb.toString();
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public String getDomainName() {
return domainName;
}
public void setDomainName(String domainName) {
this.domainName = domainName;
}
}
I am trying to autowire the User object in to DomainUser by using #Autowired annotation. But when i run the test as below, the User object is not populated.
applicationContext.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="user" class="com.domain.User">
<constructor-arg value="#{1234}"/>
<property name="userName" value="somename" />
<property name="password" value="sompassword" />
</bean>
<bean id="domainUser" class="com.domain.DomainUser">
<property name="domainName" value="mysite" />
</bean>
</beans>
DomainUserTest.java
package com.domain.test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.domain.DomainUser;
public class DomainUserTest {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
"applicationContext.xml");
DomainUser domainUser = (DomainUser) context.getBean("domainUser");
System.out.println(domainUser.toString());
}
}
If I autowire using the 'byType' in the autowiring attribute in the applicationContext.xml it works fine :
<bean id="domainUser" class="com.domain.DomainUser" autowire="byType">
<property name="domainName" value="mysite" />
</bean>
Can some one help me understand why doesnt #Autowired annotation produce the same result?

Answer 1

You need an AutowiredAnnotationBeanPostProcessor to handle the injection of #Autowired properties. You could place <context:annotation-config /> (you need to define the context-namespace in your xml) or just define the post processor as a bean in your xml:
<bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor"/>
See for example here for details.