Spring java based configuration example

Steps for spring java based configuration:

Project structure for below project:

1. Create a simple java maven project.

2. Maven dependency

put spring and cglib maven dependency in pom.xml.

   <dependencies>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-core</artifactId>
   <version>${spring.version}</version>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-webmvc</artifactId>
   <version>${spring.version}</version>
  </dependency>
<!-- cglib required for @configuration annotation -->
   <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>3.0</version>
        </dependency>
 </dependencies>
 <properties>
  <spring.version>4.2.1.RELEASE</spring.version>
 </properties>

So your pom.xml will look like:

<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/xsd/maven-4.0.0.xsd"<
  <modelVersion<4.0.0</modelVersion>
  <groupId>org.arpit.java2blog</groupId>
  <artifactId>SpringHelloWorldJavaBasedConfiguration</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>SpringHelloWorldJavaBasedConfiguration</name>
  <description>It provides hello world program for java based config
</description>

 <dependencies>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-core</artifactId>
   <version>${spring.version}</version>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-webmvc</artifactId>
   <version>${spring.version}</version>
  </dependency>
<!-- cglib required for @configuration annotation -->
   <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>3.0</version>
        </dependency>
 </dependencies>
 <properties>
  <spring.version>4.2.1.RELEASE</spring.version>
 </properties>
</project>

3. Create Bean class

package org.arpit.java2blog.model;

public class Country {

    String countryName;

    public Country(String countryName) {
  this.countryName=countryName;
 }
 public String getCountryName() {
        return countryName;
    }
    public void setCountryName(String countryName) {
        this.countryName = countryName;
    }

}

4. Create application configuration class

package org.arpit.java2blog.config;
import org.arpit.java2blog.model.Country;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class ApplicationConfiguration {

 @Bean(name="countryObj")
 public Country getCountry()
 {
  return new Country("India");
 }

}

<?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:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd"<
<context:annotation-config/<
 <bean id="countryObj" class="org.arpit.java2blog.Country" <
  <property name="countryName" value="India"/<
 </bean<
</beans<

package org.arpit.java2blog.main;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.arpit.java2blog.config.ApplicationConfiguration;
import org.arpit.java2blog.model.Country;;

public class SpringJavaConfigMain {

 public static void main(String[] args) {
  @SuppressWarnings("resource")
  ApplicationContext appContext = new AnnotationConfigApplicationContext(ApplicationConfiguration.class);
  Country countryObj = (Country) appContext.getBean("countryObj");
  String countryName=countryObj.getCountryName();

  System.out.println("Country name: "+ countryName);
 }
}

Feb 19, 2016 4:09:08 PM org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@2096ed8b: startup date [Fri Feb 19 16:09:08 IST 2016]; root of context hierarchy
Country name: India

Bingo!! we are done with spring java based configuaration.