Tuesday, April 28, 2015

Analyzing the application code by using the sonarqube ANT/MAVEN

SonarQube™ software (previously known as “Sonar”) is an open source project hosted at Codehaus. By using this we can analyze the source code, its very easy to configure and use.

1. Download and unzip the SonarQube distribution ("C:\sonarqube" or "/etc/sonarqube")

2. Start the SonarQube server: under bin folder run the executable file according to respective OS.


3.Browse the results at http://localhost:9000

we will use Embedded database for learning.

under sonarqube/conf/sonar.properties will have the db base configuration, default it uses embeded db H2 which is in build in java.

Application level ANT configuration :

Download the sonar-ant-task jar file download

copy the jar file to /lib folder

add following to existing build.xml file of the application.

<taskdef uri="antlib:org.sonar.ant" resource="org/sonar/ant/antlib.xml">
    <classpath path="path/to/sonar-ant-task-*.jar" />

if you don't want to modify the existing build.xml file then use below xml file and run "ant -f analyze-code.xml"

after the successful execution it will provide the url to access the result.

for maven application it simple run the following command

mvn clean install sonar:sonar

sample result page :

web service client JAXWS by maven

Generate web service client stub class by using the JAXWS maven plugin.

"jaxws-maven-plugin" will generate the web service stub classes by using that we can implement client or test the web service.

generated stub classes will stored under src folder and by using this service classes we can communicate with service and get the response.

for free webservice for the learning and client implementation visit xmethod.com

take any service and generate the client stub classes.

add the WSDL URL in the pom.xml

    enter the wsdl URL here

full sample :

Tuesday, April 14, 2015

JMETER load testing by code/ JMETER API implementation sample by java code

This tutorial attempts to explain the basic design, functionality and usage of the Jmeter, Jmeter is excellent tool used to perform load testing on the application, By using the jmeter GUI we can create the test samples for the request
according to our requirement and execute the samples with load of number of users.
As jmeter tool is fully developed by using JAVA, We can write the java code to do the same without using the GUI of the jmeter, Its not advisable to implement the java code for the load testing, its just a proof of concept to write the samples by java code using the jmeter libraries.
Jmeter as very good documentation/APIs, After going through the jmeter source code and other reference resources, wrote the following sample code.


Prior to understand following code we must have basic knowledge of the how jmeter works.
Initially we need load the jmeter properties which will be used by jmeter classes/libraries in later stage of code
//JMeter Engine
StandardJMeterEngine jmeter = new StandardJMeterEngine();
//JMeter initialization (properties, log levels, locale, etc)
JMeterUtils.initLogging();// you can comment this line out to see extra log messages of i.e. DEBUG level

1. Create "Test Plan" Object and JOrphan HashTree

//JMeter Test Plan, basically JOrphan HashTree
HashTree testPlanTree = new HashTree();
// Test Plan
TestPlan testPlan = new TestPlan("Create JMeter Script From Java Code");
testPlan.setProperty(TestElement.TEST_CLASS, TestPlan.class.getName());
testPlan.setProperty(TestElement.GUI_CLASS, TestPlanGui.class.getName());
testPlan.setUserDefinedVariables((Arguments) new ArgumentsPanel().createTestElement());

2. Samplers : Add "Http Sample" Object

Samplers tell JMeter to send requests to a server and wait for a response. They are processed in the order they appear in the tree. Controllers can be used to modify the number of repetitions of a sampler
// First HTTP Sampler - open uttesh.com
HTTPSamplerProxy examplecomSampler = new HTTPSamplerProxy();
examplecomSampler.setName("Open uttesh.com");
examplecomSampler.setProperty(TestElement.TEST_CLASS, HTTPSamplerProxy.class.getName());
examplecomSampler.setProperty(TestElement.GUI_CLASS, HttpTestSampleGui.class.getName());

3.Loop Controller

Loop Controller will execute the samples number times the loop iteration is declared.
// Loop Controller
LoopController loopController = new LoopController();
loopController.setProperty(TestElement.TEST_CLASS, LoopController.class.getName());
loopController.setProperty(TestElement.GUI_CLASS, LoopControlPanel.class.getName());

4.Thread Group

Thread group elements are the beginning points of any test plan. All controllers and samplers must be under a thread group. Other elements, e.g. Listeners, may be placed directly under the test plan, in which case they will apply to all the thread groups. As the name implies, the thread group element controls the number of threads JMeter will use to execute your test.

// Thread Group
ThreadGroup threadGroup = new ThreadGroup();
threadGroup.setName("Sample Thread Group");
threadGroup.setProperty(TestElement.TEST_CLASS, ThreadGroup.class.getName());
threadGroup.setProperty(TestElement.GUI_CLASS, ThreadGroupGui.class.getName());

5. Add sampler,controller..etc to test plan

// Construct Test Plan from previously initialized elements
HashTree threadGroupHashTree = testPlanTree.add(testPlan, threadGroup);
// save generated test plan to JMeter's .jmx file format
SaveService.saveTree(testPlanTree, new FileOutputStream("report\\jmeter_api_sample.jmx"));
above code will generate the jmeter script which we wrote from the code.

5. Add Summary and reports

//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, we can save file as csv also
String reportFile = "report\\report.jtl";
String csvFile = "report\\report.csv";
ResultCollector logger = new ResultCollector(summer);
ResultCollector csvlogger = new ResultCollector(summer);
testPlanTree.add(testPlanTree.getArray()[0], logger);
testPlanTree.add(testPlanTree.getArray()[0], csvlogger);

Finally Execute the test

// Run Test Plan

System.out.println("Test completed. See " + jmeterHome + slash + "report.jtl file for results");
System.out.println("JMeter .jmx script is available at " + jmeterHome + slash + "jmeter_api_sample.jmx");

Full Source Code of the POC is available on the GitHub click here
Simple source :

Generate JMX sample file by code and opened in jmeter UI.

Summary Report generated by code after test execution

Wednesday, April 8, 2015

get byte or memory size of array,list,collections in java

In java lot of time we will come across the scenerio where in which we need to find the how much memory used by given list.

The ArrayList holds a pointer to a single Object array, which grows as the number of elements exceed the size of the array. The ArrayList's underlying Object array grows by about 50% whenever we run out of space.

ArrayList also writes out the size of the underlying array, used to recreate an identical ArrayList to what was serialized.

sample code to get the memory size the collection in bytes