How to generate response times graph from Jmeter programmatically - jmeter

Question

I have the following java code to run JMeter.
import org.apache.jmeter.control.LoopController;
import org.apache.jmeter.engine.StandardJMeterEngine;
import org.apache.jmeter.protocol.http.sampler.HTTPSampler;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.testelement.TestPlan;
import org.apache.jmeter.threads.SetupThreadGroup;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.collections.HashTree;
public class HCTGameDay {
public static void main(String[] args){
// Engine
StandardJMeterEngine jm = new StandardJMeterEngine();
// jmeter.properties
JMeterUtils.loadJMeterProperties("/Users/rokumar/Desktop/jmeter.properties");
HashTree hashTree = new HashTree();
// HTTP Sampler
HTTPSampler httpSampler = new HTTPSampler();
httpSampler.setDomain("www.linkedin.com");
httpSampler.setPort(80);
httpSampler.setPath("/");
httpSampler.setMethod("GET");
// Loop Controller
TestElement loopCtrl = new LoopController();
((LoopController)loopCtrl).setLoops(1);
((LoopController)loopCtrl).addTestElement(httpSampler);
((LoopController)loopCtrl).setFirst(true);
// Thread Group
SetupThreadGroup threadGroup = new SetupThreadGroup();
threadGroup.setNumThreads(1);
threadGroup.setRampUp(1);
threadGroup.setSamplerController((LoopController)loopCtrl);
// Test plan
TestPlan testPlan = new TestPlan("HCT TEST PLAN");
hashTree.add("testPlan", testPlan);
hashTree.add("loopCtrl", loopCtrl);
hashTree.add("threadGroup", threadGroup);
hashTree.add("httpSampler", httpSampler);
jm.configure(hashTree);
jm.run();
}
}
I do not get any results in the console output . Where are the response times etc. stored and how do I plot the graph of response times, number of connections, number of users programmatically.

Answer 1

Add the following code before jm.configure(hashTree) line
//add Summarizer output to get test progress in stdout like:
// summary = 2 in 1.3s = 1.5/s Avg: 631 Min: 290 Max: 973 Err: 0 (0.00%)
Summariser summer = null;
String summariserName = JMeterUtils.getPropDefault("summariser.name", "summary");
if (summariserName.length() > 0) {
summer = new Summariser(summariserName);
}
// Store execution results into a .jtl file
String logFile = jmeterHome + System.getProperty("line.separator") + "example.jtl";
ResultCollector logger = new ResultCollector(summer);
logger.setFilename(logFile);
testPlanTree.add(hashTree.getArray()[0], logger);
It will generate example.jtl file in /bin folder of your JMeter installation which is the usual JMeter result file suitable for analysis, graphs generation, etc.
See chapter 4.3 of 5 Ways To Launch a JMeter Test without Using the JMeter GUI guide for details on how to run JMeter test from Java code in general and example class at https://bitbucket.org/blazemeter/jmeter-from-code/ in particular for reference.