This tutorial shows you how to create a simple hello world example in Spring 3.0.
Technologies used in this article :

• Spring 3.0.5.RELEASE
• Maven 3.0.3
• Eclipse 3.6
• JDK 1.6.0.13

P.S Spring 3.0, at least JDK 1.5 is required to work.

*Spring 3.0 dependencies
*In Spring 2.5.x, almost the entire Spring modules are grouped into a single spring.jar file. Since Spring 3.0, every modules are split into an individual jar file, for example, spring-core, spring-expression, spring-context, spring-aop and etc.

1. Generate project structure with Maven

Issue below Maven command to create a standard Java project structure.

mvn archetype:generate -DgroupId=com.mkyong.core -DartifactId=Spring3Example    -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

2. Convert to Eclipse project

Convert Maven style project to Eclipse’s style project, and import into Eclipse IDE.

mvn eclipse:eclipse

3. Add Spring 3.0 dependency

Add the Spring 3.0 dependencies listed below in Maven’s pom.xml file. The Spring dependencies are available for download via Maven central repository.
File : pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"  
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
              xsi:schemaLocation="http://maven.apache.org/POM/4.0.0     
                                                http://maven.apache.org/maven-v4_0_0.xsd">  
    <modelVersion>4.0.0</modelVersion>  
    <groupId>com.mkyong.core</groupId>  
    <artifactId>Spring3Example</artifactId> 
    <packaging>jar</packaging>  
    <version>1.0-SNAPSHOT</version> 
    <name>Spring3Example</name> 
    <url>http://maven.apache.org</url>  
    <properties>        
        <spring.version>3.0.5.RELEASE</spring.version>  
    </properties>   
    <dependencies>      
        <!-- Spring 3 dependencies -->      
        <dependency>            
            <groupId>org.springframework</groupId>          
            <artifactId>spring-core</artifactId>            
           <version>${spring.version}</version>     
        </dependency>       
        <dependency>            
           <groupId>org.springframework</groupId>           
           <artifactId>spring-context</artifactId>          
           <version>${spring.version}</version>     
      </dependency> 
    </dependencies>
</project>

3. Spring bean

A simple Spring bean.

package com.mkyong.core;

/** * Spring bean * */
public class HelloWorld {   
    private String name;    
    public void setName(String name) {      
        this.name = name;   
    }   
    public void printHello() {      
        System.out.println("Spring 3 : Hello ! " + name);   
    }
}

4. Spring bean configuration file

Create a Spring configuration file, and declare all the available Spring beans.
File : SpringBeans.xml

<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="helloBean" class="com.mkyong.core.HelloWorld">        
        <property name="name" value="Mkyong" /> 
    </bean>
</beans>

5. Review project structure

Review directory structure as follows

Spring3-hello-world-example

6. Run It

Run it.

package com.mkyong.core;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App {  
    public static void main(String[] args) {        
        ApplicationContext context = new ClassPathXmlApplicationContext("SpringBeans.xml");      
        HelloWorld obj = (HelloWorld) context.getBean("helloBean");     
        obj.printHello();   
    }
}

7. Output

Spring 3 : Hello ! Mkyong