Injecting the properties of object through Spring which is created outside the Spring container

[Rahul Shivsharan]

My bean-cfg-Two.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:aop="http://www.springframework.org/schema/aop"
		xsi:schemaLocation="
			http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
			http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd">
		
<aop:spring-configured/>

		<bean id="spCar-inj" class="com.impl.SportsCar">
			<constructor-arg value="Ferrari" />
		</bean>
		
		<bean id="per-empl-inj" class="com.impl.PermanentEmpl"  />
		<bean id="cont-empl-inj" class="com.impl.ContractEmpl"  />	
		
		<bean id="mgr-inj-2" class="com.impl.Manager" abstract="true">
			<property name="employees">
				<list>
					<ref bean="per-empl-inj" />
					<ref bean="cont-empl-inj" />
				</list>
			</property>
			<property name="car" ref="spCar-inj" />
		</bean>
		
</beans>

My Manager.java which is annotated by @Configurable

package com.impl;
import java.util.*;
import com.inter.Employee;
import org.springframework.beans.factory.annotation.Configurable;

@Configurable("mgr-inj-2")
public class Manager implements Employee{
	private Car car;
	private List<Employee> employees;
	
	public Manager(){
		System.out.println(" Manager is Instantiated... ");
	}
	
	public void setCar(Car car){
		this.car = car;
	}
	
	public Car getCar(){
		return this.car;
	}
	
	public void setEmployees(List<Employee> employees){
		this.employees = employees;	
	}
	
	public List<Employee> getEmployees(){
		return this.employees;
	}
	
	@Override
	public void income(){
		System.out.println(" In the method doit..... "+(this.employees != null ? this.employees.size() : "NULL"));
		for(Employee emp : this.employees){
			emp.income();
		}
		
		this.car.carType();
	}
}

My MainPractise19.java having the main method,

package com.main;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.ApplicationContext; 
import com.impl.*;


public class MainPractise19{
	public static void main(String [] args){
		ApplicationContext applicationContext = null;
		Manager obj = null;
		try{
			applicationContext = new ClassPathXmlApplicationContext("bean-cfg-Two.xml");			
			//obj = (Manager) applicationContext.getBean("empl-inj");		
			obj = new Manager();
			obj.income();
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}

in the above code i have created Manager object outside the spring container,
but what i expected was the properties of the Manager object will be injected by the spring container,

but still i am getting a null pointer exception in Managers income() method ant emp.income() line, why ?

Whether spring has injected the properties ?

I am missing some thing ?

[Jeevan Kulkarni]

Hi,

Spring container will inject values into Manager only if the instance of the class created is obtained from spring application context i.e. by doing getBean.

But I do not see any bean defined with id="empl-inj" .. in the commented code.

obj = (Manager) applicationContext.getBean("empl-inj");

Thanks,
Jeevan

[Rahul Shivsharan]

forget the commented code,

i repeat my question

the object of Manager is created outside the Spring container,

but still Spring Container should be able to inject the properties in object Manager as it is anotated @Configurable,

but the properties are not getting injected ?
why ?

do i am missing any xml schema definition or a jar,

i have inccluded all spring 3.0 jars plus
aopalliance-1.0.jar
aspectjrt-1.0.5.jar
aspectjweaver-1.5.2.jar


so why nullpointer exception

[Rishi Shehrawat]

Spring can only manage dependencies of objects created/managed by Spring. By using new operator you are bypassing Spring, this is the reason properties are not getting injected.
Your understanding of @Configurable is incorrect. Please refer to Spring docs.