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REST stands for "Representational State Transfer". It is just a software architectural style, or a set of design rules that can be used to write web services. Because it is a style, there are no standards defined for this.

How does REST works?
Representational State Transafer means the state of the client changes based on the representation of the resource. Imagine surfing a web page using a URL. When you access the URL, a page (resource) is returned to you. When you select another page, a different representation of the resource is retuned. Based on the the representation returned, the state of the client (calling application) also changes.

       public static void main(String args[]){

Apache JMeter is an open source tool that can be used to measure the performance of Java applications. The JMeter can be used to test a wide range of Java applications like web, EJB, web services etc. I am not going to elaborate more on this, and you can get more information about this from the Apache JMeter website at

The JMeter can also be extended, to create your own test plans. In this section I will explain the steps needed to create a custom JavaRequest sampler, and run it using JMeter.

To write the code you need to add the ApacheJMeter jar files to your classpath. The below code describes the simple JavaSampler:

package com.test;

import org.apache.jmeter.config.Arguments;
import org.apache.jmeter.samplers.SampleResult;

 * @author ggeorge
public class MyTestJavaSampler implements JavaSamplerClient {

    public void setupTest(JavaSamplerContext arg0) {

    public SampleResult runTest(JavaSamplerContext arg0) {
        SampleResult sr = new SampleResult();
        sr.setResponseMessage("This is my first message");
        return sr;

    public void teardownTest(JavaSamplerContext arg0) {

    public Arguments getDefaultParameters() {
        Arguments args = new Arguments();
        args.addArgument("Name", "");
        args.addArgument("Password", "");
        return args;

  • Create a jar file for this code, and place in under the <jmeter_install_dir>/lib/ext directory.
  • Start JMeter and when you try to create a new JavaRequest sampler, you should be able to select the new class that you created.

You can customize this class for whatever performance test you want to run.