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<div style="color: #274e13;">In this tutorial you will write first spring hello world example using spring framework with STS tool. In previous you <a href="https://dineshonjava.com/setting-up-environment-of-spring/">set up the Spring Environment</a> of your Local machine. So let us proceed to write a simple Spring Application which will print &#8220;Hello World!&#8221; message based on the configuration done in Spring Beans Configuration file.</div>
<div style="color: #274e13;"></div>
<h2 style="color: #274e13;">Step 1 &#8211; Create Spring Project:</h2>
<div style="color: #274e13;"> The first step is to create a simple Spring Project using STS IDE. Follow the option <b>File ->; New ->; Project</b> and finally select <b>Spring Project</b> wizard from the wizard list. Now name your project as <b>spring01HelloWorld </b>using the wizard window as follows:</div>
<p> ;</p>
<div class="separator" style="clear: both; text-align: center;"><img src="https://dineshonjava.com/wp-content/uploads/2012/06/step1.jpg" width="640" height="540" border="0" /></div>
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</div>
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<span style="color: red;font-size: x-large;text-align: center;"><b>Popular Tutorials</b></span></p>
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<div style="color: #274e13;">Once your project is created successfully, you will have following content in your Project Explorer:</div>
<div style="color: #274e13;">
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<div class="separator" style="clear: both; text-align: center;"><img src="https://dineshonjava.com/wp-content/uploads/2012/06/step2spring.jpg" border="0" /></div>
</div>
<h2 style="color: #274e13;">Step 2 &#8211; Add Required Libraries:</h2>
<div style="color: #274e13;">As a second step let us add Spring Framework and <b>common logging API</b> <b>libraries </b>in our project. To do this, <b>right click</b> on your project name <b>spring01HelloWorld</b> and then follow the following option available in context menu: <b>Build Path ->; Add Libraries&#8230;</b> display window as follows:</div>
<p> ;</p>
<div class="separator" style="clear: both; text-align: center;"><img src="https://dineshonjava.com/wp-content/uploads/2012/06/step2.jpg" width="640" height="465" border="0" /></div>
</div>
</div>
</div>
<p> ;</p>
<div style="color: #274e13;">In next window wizard click on <b>User Library >;>; Next</b> as following:</div>
<div style="color: #274e13;"></div>
<div class="separator" style="clear: both; text-align: center;"><img src="https://dineshonjava.com/wp-content/uploads/2012/06/stepSpring2.jpg" border="0" /></div>
<div style="color: #274e13;"></div>
<div style="color: #274e13;"> After <b>Next </b>add user library name as <b>spring-lib</b> and add following <b>minimum required jar files</b> to this user library :</div>
<ul class="list" style="color: #660000;">
<li>antlr-runtime-3.0.2</li>
<li>org.springframework.aop-3.2.0.M1</li>
<li>org.springframework.asm-3.2.0.M1</li>
<li>org.springframework.aspects-3.2.0.M1</li>
<li>org.springframework.beans-3.2.0.M1</li>
<li>org.springframework.context.support-3.2.0.M1</li>
<li>org.springframework.context-3.2.0.M1</li>
<li>org.springframework.core-3.2.0.M1</li>
<li>org.springframework.expression-3.2.0.M1</li>
<li>commons-logging-1.1.1</li>
</ul>
</div>
<div class="separator" style="clear: both; text-align: center;"><img src="https://dineshonjava.com/wp-content/uploads/2012/06/stepSpring4.jpg" width="640" height="386" border="0" /></div>
</div>
<p> ;</p>
<h2 style="color: #274e13;">Step 3 &#8211; Create Source Files:</h2>
<div style="color: #274e13;">Now let us create actual source files under the <b>spring01HelloWorld</b> project. First we need to create a package called <b>com.sdnext.dineshonjava.tutorial</b>. To do this, right click on <b>src </b>in package explorer section and follow the option : <b>New ->; Package</b>.</div>
<div style="color: #274e13;"></div>
<div style="color: #274e13;">Next we will create <b>HelloWorld.java</b> and <b>SpringTestApp.java</b> files under the <b>com.sdnext.dineshonjava.tutorial</b> package.</div>
<div style="color: #274e13;"></div>
<div class="separator" style="clear: both; text-align: center;"><img src="https://dineshonjava.com/wp-content/uploads/2012/06/step3.jpg" border="0" /></div>
<p> ;</p>
</div>
<p><b>HelloWorld.java</b></p>
<pre class="highlight">package com.sdnext.dineshonjava.tutorial; 
 
public class HelloWorld { 
 private String message; 
 
 public void setMessage(String message){ 
 this.message = message; 
 } 
 
 public void getMessage(){ 
 System.out.println("Your Message : " + message); 
 } 
} 
</pre>
<p><b>SpringTestApp.java</b></p>
<pre class="highlight">package com.sdnext.dineshonjava.tutorial; 
 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
 
public class SpringTestApp 
{ 
 public static void main(String[] args) 
 { 
 //ClassPathXmlApplicationContext is load all beans in the application 
 ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml"); 
 
 //this step is used to get required bean using getBean() method of the created context 
 HelloWorld helloWorld= (HelloWorld) context.getBean("helloWorld"); 
 helloWorld.getMessage(); 
 } 
} 
</pre>
<p> ;</p>
<div style="color: #274e13;">There are following two important points to note about the main program:</div>
<ol class="list" style="color: #274e13;">
<li>First step is to create application context where we used framework API <b>ClassPathXmlApplicationContext()</b>. This API loads beans configuration file and eventually based on the provided API, it takes care of creating and initializing all the objects ie. beans mentioned in the configuration file.</li>
<li>Second step is used to get required bean using <b>getBean()</b> method of the created <b>context</b>. This method uses <b>bean ID</b> to return a generic object which finally can be casted to actual object. Once you have object, you can use this object to call any class method.</li>
</ol>
<h2 style="color: #274e13;">Step 4 &#8211; Create Bean Configuration File:</h2>
</div>
<div style="color: #274e13;">Now we have to create Bean Configuration file which is an <b>XML </b>file which maintain all classes object as bean. It is also called as <b>Bean Factory Configuration</b>. Keep this file(spring.xml) on the <b>src </b>directory of the spring project.</div>
<div style="color: #274e13;">The <b>spring.xml</b> is used to assign unique IDs to different beans and to control the creation of objects with different values without impacting any of the Spring source files. For example, using below file you can pass any value for &#8220;message&#8221; variable and so you can print different values of message without impacting <b>HelloWorld.java</b> and <b>SpringTestApp.java</b> files.</div>
<div style="color: #274e13;">Let us see how it works:</div>
<p><b>spring.xml</b></p>
<pre class="highlight"><;beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xsi:schemalocation="http://www.springframework.org/schema/beans 
 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">; 
 
 <;bean class="com.sdnext.dineshonjava.tutorial.HelloWorld" id="helloWorld">; 
 <;property name="message" value="Hello World!">; 
 <;/property>;<;/bean>; 
<;/beans>; 
</pre>
<div style="color: #274e13;">
<p>After creation of the bean <b>configuration file(Spring.xml)</b>, now we put this file into <b>&#8220;src&#8221;</b> directory of the application(i.e. which is present in classpath). Then <b>configuration file(Spring.xml) </b>is loaded in the ApplicationContext as follows.</p>
<pre class="highlight">ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml"); 
</pre>
<p>Now suppose we put <b>configuration file(Spring.xml)</b> into the different directory package other than <b>&#8220;src&#8221;</b> like <b>&#8220;com.dineshonjava.sdnext.springConfig&#8221;</b> then we have to give classpath of <b>configuration file(Spring.xml) </b>to ApplicationContext as follows:</p>
<pre class="highlight">ApplicationContext context = new ClassPathXmlApplicationContext("classpath:com/dineshonjava/sdnext/springConfig/spring.xml"); 
</pre>
<p>We can use wildcard for this as follows:</p>
<pre class="highlight">ApplicationContext context = new ClassPathXmlApplicationContext("classpath*:com/dineshonjava/**/springConfig/spring.xml"); 
</pre>
<p> ;</p>
<pre class="highlight">ApplicationContext context = new ClassPathXmlApplicationContext("classpath*:com/*/**/springConfig/*-spring.xml"); 
</pre>
<p>When Spring application gets loaded into the memory, Framework makes use of the above configuration file to create all the beans defined and assign them a unique ID as defined in tag. You can use tag to pass the values of different variables used at the time of object creation.</p>
<p>Now run the program you will get following output on console.</p>
</div>
<div style="background-color: #ff99cc; border-width: thin; border: solid;">
<div style="color: blue;"><b>Output:</b></div>
<div style="color: red;">Jun 16, 2012 4:45:17 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh</div>
<div style="color: red;">INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@145d068: startup date [Sat Jun 16 16:45:17 IST 2012]; root of context hierarchy</div>
<div style="color: red;">Jun 16, 2012 4:45:17 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions</div>
<div style="color: red;">INFO: Loading XML bean definitions from class path resource [spring.xml]</div>
<div style="color: red;">Jun 16, 2012 4:45:18 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons</div>
<div style="color: red;">INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@15212bc: defining beans [helloWorld]; root of factory hierarchy</div>
<div style="color: #274e13;"><b>Your Message : Hello World!</b></div>
</div>
<div class="separator" style="clear: both; text-align: center;"><img src="https://dineshonjava.com/wp-content/uploads/2012/06/outputSpring.jpg" width="640" height="126" border="0" /></div>
</div>
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<div style="color: #274e13;"><b>In the <a href="https://dineshonjava.com/spring-ioc-container/">Next chapter</a> we will discuss about the <a href="https://dineshonjava.com/spring-ioc-container/">IoC Contianer</a> in its role in the Spring Framework.</b></div>
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