Spring Autowiring By Construtor

If your bean is configured using constructor injection, you may choose to put away the <constructor-arg> elements and let Spring automatically choose constructor arguments from beans in the Spring context.

You can configure this like :

<bean id="employee" class="com.kruders.bean.Employee" autowire="constructor">
    <property name="name" value="Puneet" />

First create a new Java Project and configure it as Maven Project. For Reference, Click Here

Add the following dependencies in pom.xml





Now create Employee Class as following.

package com.kruders.bean;

public class Employee {
	private String name;
	private Address address;
	public Employee(Address address) {
		this.address = address;
	public String getName() {
		return name;
	public void setName(String name) {
		this.name = name;
	public Address getAddress() {
		return address;
	public void setAddress(Address address) {
		this.address = address;

Now create Address Class as following

package com.kruders.bean;

public class Address {
	private String city;
	private String country;
	public String getCity() {
		return city;
	public void setCity(String city) {
		this.city = city;
	public String getCountry() {
		return country;
	public void setCountry(String country) {
		this.country = country;

2. Configuration

Create Spring-Bean.xml and write the following code

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

	<bean id="employee" class="com.kruders.bean.Employee" autowire="constructor">
	   <property name="name" value="Puneet" />
	<bean id="address" class="com.kruders.bean.Address" >
		<property name="city" value="Delhi" />
		<property name="country" value="India" />


Autowiring by constructor shares the same limitations as byType. Spring won’t attempt to guess which bean to autowire when it finds multiple beans that match a constructor’s arguments. Furthermore, if a class has multiple constructors, any of which can be satisfied by autowiring, Spring won’t attempt to guess which constructor to use.

3. Run Program

Create Main.java class that displays the employee and address details and run it as Java Application

package com.kruders.core;

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

import com.kruders.bean.Employee;

public class Main {
	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext(
		Employee employee = (Employee) context.getBean("employee");

		System.out.println("Name " + employee.getName());
		System.out.println("City " + employee.getAddress().getCity());
		System.out.println("State " + employee.getAddress().getCountry());


When you run the above example you’ll get an output like:

Name Puneet
City Delhi
State India

The folder structure of the example is shown below in Figure 25.1

Figure 25.1 Figure 25.1

You can download the source code of this example here.

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