Performance Testing

Write data in .xls and .xlsx (Excel) file using POI

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As we know that file is very most important in our day to day life, we frequently use to create a file, open it and update or delete something from file. Same thing in selenium automation as well we need to manipulate the file.

So, In this blog we will learn how to install the poi jar file, what jar file are required for that and how to perform the read operation on excel with the help of JAVA IO package and APACHE POI library.

POI library is enough to read write both XLS and XLSX file.

Note : For .XLS file read write, we can use .JXL jar file but it won’t support to .xlsx file.


Let’s begin the journey: – 

Step 1. If you haven’t eclipse then Install the Eclipse latest version.

Step 2. If you haven’t added WebDriver then download the webdriver jar file and add to library.

Step 3. If you are using Maven then use the following dependencies.

                           <!– –>






Or else you can directly download latest POI jar file from

Step 4. Once the downloaded jar file then unzip the file and add library file into your project.

Right click on your project -> Build Path -> Configure Build Path-> Library -> Add External Jar-> ok

Note: Below are java interfaces and classes that we will use for read/write xls and xlsx file in POI

XSSFWorkbook : – Is a class representation of XLSX file.

HSSFWrokbook  : – Is a class represent of XLS file.

XSSFSheet :- XSSFSheet classes implement this interface represent XLSX file’s sheet.

HSSFSheet : – HSSFSheet classes implement this interface XLS file’s sheet.

XSSFRow :- XSSFSheet classes implement this interface represent to a row of XLSX file.

HSSFRow : – HSSFSheet classes implement this interface represent to a row of XLS file.

XSSFCell :- XSSFSheet classes implement this interface represent a cell in a row of XLSX file.

HSSFCell : – HSSFSheet classes implement this interface represent a cell in a row of XLS file.


Write Data in Excel sheet

package Account;






import org.apache.poi.xssf.usermodel.XSSFCell;

import org.apache.poi.xssf.usermodel.XSSFRow;

import org.apache.poi.xssf.usermodel.XSSFSheet;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;


public class WriteInExcel {

public static void main(String args[])throws IOException{


String ctVal= “Status”;


// File Location

File src = new File(“D://Dazeworks//Selenium Projects//Credential.xlsx”);

// Open File using FileInputStream class

FileInputStream fis = new FileInputStream(src);


// Create Workbook instance holding reference to .xlsx file

XSSFWorkbook workbook = new XSSFWorkbook(fis);


// Get first/desired sheet from the workbook

XSSFSheet sheet = workbook.getSheetAt(0);

// Entering a value in Row[0] and Cell[4]. Here cell is nothing but Column number



// If user want to enter value as per choice row then Needs to create row where he wants to get enter the value

XSSFRow r = sheet.createRow(14);

//Create a cell for the value where you want to enter.

XSSFCell c = r.createCell(10);

//Entering the Value for particular cell

c.setCellValue(“How’s Josh????”);

//Using FileOutputStream we will get in which file we have to write

FileOutputStream fos = new FileOutputStream(src);

// Writing in the values in workbook


//File close



System.out.println(“Value inserted successfully”);






Common problems in the software development process?

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There are 5 common problems in software development process

Poor Requirement: –   Unclear details, Incomplete requirement, and too general.

Inadequate testing: – No one knows whether your program is any good till the customers complains or system crashes.

Features: – A request to pile on new features after development is underway, Actually this extremely common.

Miscommunication: – If developers don’t know what’s needed or customers have erroneous expectations problem are guaranteed

SDLC (Software Development Life cycle)

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A Software development life cycle is composed of a number of clearly defined and distinct work phases which are used by Software engineers and Software developers to plan for, design, build, test, and deliver Software. Like anything that is developed on an assembly line, an SDLC aims to produce high-quality software that meet or exceed customer expectations, based on customer requirements, by delivering software which move through each clearly defined phase, within scheduled time frames and cost estimates.

The SDLC is not a methodology, but rather a description of the phases in the life cycle of a software application. These phases (speaking) are

  1. Requirement Gathering
  2. Analysis
  3. Design
  4. Coding (Development)
  5. Testing
  6. Implementatiion
  7. Maintenance / Services


Requirement Gathering

In this Phase, Business Analyst will gather the all requirement from the client/customer and prepare Business requirement specification (BRS) or Customer requirement specification (CRS) or User Requirement Specification (URS). Senior business Analyst will prepare the System/Software requirement Specification (SRS) documents.

Rule for Successful requirement gathering

  1. Always Ask – don’t assume you know what user wants.
  2. Include the users from the starting.
  3. Define and agree on the scope of the project.
  4. Requirement should be SMART – specific, Measurable, Agree upon, Realistic and Time-based.
  5. Gain clarity if there is any doubt.
  1. Create clear user requirement document and share with the customer (play them back).
  1. Avoid talking about technology or solutions until the requirements are fully understood.
  2. Get the requirements agreed with the stakeholders before the project starts.
  3. Create a prototype model, if necessary, to confirm or refine the customer’s requirements.


It is a method that allows the analyst to understand the system and its activities in a logical way. It is a systematic approach to analyse and refine the existing system and develop a new system specification which can be easily understandable by user.

Note: –The features and the functions that need to be put in the project are determined/analysed.


It will be done by the very experienced person like Chief Architect or technical Team Leader or Architect.

Architect will have prepared the HLD (High Level design) and LLD (Low Level Design).

HLD: – High Level Design

  • List of modules and a brief description of each module.
  • Brief functionality of each module.
  • Interface relationship among modules
  • Database tables identified along with the key element.
  • Overall architecture diagrams along with technology details.

Example1.1: Data flow diagram for high level designshashikant_Dataflow

LLD: – Low Level Design

  • Detailed functional logic of the module.
  • Database table, with all elements, including their type and size.
  • All dependency issue Error Message Listings.
  • Complete input and Output for a module.

Example1.2: Data flow diagram for high level designShashikant_LowLevel


Based on the HLD and LLD document, small modules are summed together and developed.



If testing is done correctly, it increases the overall software quality. This phase done by Test Engineers. Different types of testing performed by test engineers.

  • Functional Testing and Non-Functional Testing.
  • Black-Box Testing and White-Box Testing.
  • Static & Dynamic Testing
  • Unit testing
  • System testing
  • Performance Testing
  • Load Testing




The Implementation phase is when the end user of your software is foremost in your mind. During this phase, you create the documentation and tools the customer uses to make informed decisions about how to deploy your software securely. To this end, the Implementation phase is when you establish development best practices to detect and remove security and privacy issues early in the development cycle.



The Maintenance Phase occurs once the system is operational. It includes implementation of changes that software might undergo over a period of time, or implementation of new requirements after the software is deployed at the customer location. The maintenance phase also includes handling the residual errors that may exist in the software even after the testing phase. This phase also monitors system performance, rectifies bugs and requested changes are made.

A Maintenance, often turned support, is a crucial activity for linking the experiences of users/customers with the product delivery organization. We consider perspectives on high tech maintenance from bug fixing through to design focused activities.

Key Deliverables:

  • Keep system live
  • Maintain code
  • Update software when required

Sources: –


Start and Stop Testing When?

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Start Testing – When?

Testing Starts right from the requirements gathering phase and continues till the release time.



Objective of early testing

Requirements related defects caught later in the SDLC, Result in higher cost to fix the defect.


Stop Testing – When?

Following factors are considered to stop testing: –

  • Test cases executed with the acceptable percentage of defects.
  • Project deadlines Ex: – Release Deadline, Testing Deadline.
  • Test budget has been run out.
  • Coverage of code, Functionality or Requirements reaches to specific point.
  • Bug rate falls below the acceptable level.



Reason to stop testing?


Software Testing Basic Concept

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What is testing?

In general term testing is finding out how well something works. In terms of human beings, testing tells what level of knowledge or skill has been acquired. In Hardware and software, testing is used at key checkpoints in the overall process to determine whether requirements are being met.

What is Software Testing?

  1. It is stated as the process of validating and verifying that a software/Program/Application or Product:
  •  Works as expected according to the business and technical requirements.
  •  Works Consistently and Predictably.
  1. It is not sufficient to demonstrate that the software is doing what it is supposed to do. It is more important to demonstrate that the software is not doing what it is not supposed to do.
  1. It is process of finding defects i.e. variance between Expected result and Actual results. And process of executing a software program application with intent of finding errors.

Why is Testing necessary?

User don’t like bugs, so testing

Software testing is necessary to make sure the product or application is defect free, as per customer specifications. Software testing identifies faults whose removal increases the software quality and increases the software reliability.

Testing effort is directly proportional to the complexity of the program. More complex the program, more the testing effort is required.

Software Testing is necessary, because software should be: –

–          Error Free

–          Efficient

–          Secured

Software Testing is important as it may cause mission failure, Impact on operational performance and unreliable if not done properly.

When Testing Start?

Testing start right from the requirement phase and continue till the release time. The main objective of early starting, if requirement related defects caught later in the SDLC result in higher cost to fix the defect.

How we can do Testing?

There is two way for testing.

  1. Manual Testing: – In Manual Testing, Testers manually execute test cases and find defect  without the uses of any tools or Automation scripts.


2.  Automation Testing: – It is a process of instructing a tool to perform an operation on an      application under test. Test automation is the use of software to control the execution of  tests & the comparison of expected v/s actual result.