Singleton Bean Scope Example

Step 1. Create model class, in which put some attribute and make setter and getter methods for these attribute and also define a method that will be called from main class to get object info.

package com.ps.model;

public class JobSeeker {

       private int jobSeekerId;

       private String jobSeekerName;

      

       public int getJobSeekerId() {

             return jobSeekerId;

       }

       public void setJobSeekerId(int jobSeekerId) {

             this.jobSeekerId = jobSeekerId;

       }

       public String getJobSeekerName() {

             return jobSeekerName;

       }

       public void setJobSeekerName(String jobSeekerName) {

             this.jobSeekerName = jobSeekerName;

       }

      

       public void display()

       {

             System.out.println("Id: "+this.getJobSeekerId()+" and Name: "+this.getJobSeekerName());

       }

      

}

Step 2. Create spring bean configuration file that contains metadata of beans.

<?xml version="1.0" encoding="UTF-8"?>

<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.xsd">

    <!-- bean definitions here -->

    <bean id="js" class="com.ps.model.JobSeeker" scope="singleton">

    </bean>

</beans>

Step 3. Create main class from where spring container will initialize the container and all beans objects.

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestBeanScope {

       public static void main(String[] args) {

            

             //create ctx object

             ApplicationContext ctx = new ClassPathXmlApplicationContext("spring.xml");

            

             JobSeeker jsObj=(JobSeeker) ctx.getBean("js");

              jsObj.setJobSeekerId(1000);

              jsObj.setJobSeekerName("Heera");

             jsObj.display();

            

             JobSeeker jsObj2=(JobSeeker) ctx.getBean("js");

             jsObj2.display();

       }

}

Sample output

Id: 1000 and Name: Heera

Id: 1000 and Name: Heera