Rahul Kumar

Software Engineer, Hewlett Packard Enterprise

Rahul Kumar

Hello Folks, Myself Rahul Kumar, a passionate Java Developer. I have worked for different Scalable and fault tolerant Enterprise solutions in different companies like Ericsson, Thomson Reuters.I always like to learn recent IT trends going around world. Most of time I like to work as a Full Stack developer. As of now My Technology Stack includes JSE (Core Java), J2EE(Servlet & JSP), REST WebServices(Using JAX-RS) ,SOAP services(Using JAX-WS),Spring Core,Spring DAO, Spring Boot,Spring Cloud,Hibernate(An JPA Implementation) ,Microservices and their development using Spring Cloud, Docker containers, Docker swarm cluster, Ansible as Configuration management tools, Cloud computing( AWS & Openstack cloud platform), Maven(as a preferred build tool) etc. From Frontend developement perspective my favorite language and frameworks are Javascript, Typescript and Angular. Preferred NoSql DB is Redis. My Recent Learning & Research Area Includes Artificial Intelligence ,Machine Learning, Internet of Things(IOT) etc.

Areas of Expertise

Java

Recent Posts

10 things developers need to know about JShell

10 things developers need to know about JShell

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By Rahul Kumar

JShell was introduced in JDK 9 as part of Java Enhancement Proposal (JEP) 222 under project Kulla. Many programming languages, such as JavaScript, Python, Ruby, etc., provide easy-to-use, command-line tools for their execution, but Java was still missing such a utility. So, JDK 9 introduced the Java shell (JShell) tool.

I discussed the basics of JShell (which is a Read-Evaluate-Print-Loop; REPL) in a previous article. In this article, I’ll cover advanced concepts in JShell that users should know for rapid development.

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Simplify Local Variable Type Definition Using the Java 10 var Keyword

Simplify Local Variable Type Definition Using the Java 10 var Keyword

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By Rahul Kumar

As many of you might have heard, Java 10 was released in March 2018. It is a short-term release from Oracle Corporation and came with lot of new features and enhancements. One of the important features in Java 10 is local variable type inference, which is detailed in JEP (Java Enhancement Proposal) 286. The upcoming Java release, due in September 2018, will be a long-term-support (LTS) version of Java. (Note that generally, LTS releases are due every three years.)

Let’s look at a  Java 10 local variable type inference feature example now.

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How to use JShell: An Command Line tool introduced in JDK 9

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By Rahul Kumar

Many of you might be aware that Oracle released JDK 9 officially on 21st September, 2017. After JDK 5 and JDK 8, JDK 9 is supposed to be the most effective release from application development perspective. JDK 9 has introduced a lot of new functionality, language level features and API enhancements for developers. This article is about one of command line tool named JShell introduced in JDK 9. Lets learn about it in short.

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Handling Exception Scenarios in REST API developed using JAX-RS

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By Rahul Kumar

Prerequisite: Hands on Knowledge of REST API Development using JAX-RS.

REST Services has been an integral part of complex enterprise applications for several years. Developers generally prefer two APIs listed below for building REST API in their enterprise applications.

  1. JAX-RS – Part of JEE Specification with different implementations like RestEasy, Jersey, Restlet etc.
  2. Spring Boot – An OpenSource Spring Community Project best suited for Microservices-based applications.

In this Article, we will learn how to handle Exceptions gracefully in Rest APIs which are built using JAX-RS.

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Know how RESTful your API is: An Overview of the Richardson Maturity Model

Know how RESTful your API is: An Overview of the Richardson Maturity Model

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By Rahul Kumar

Most of the time, I see developers are bit confused about the term REST. For some enterprise application developers, the meaning of REST is JSON i.e. if they are using JSON in their application, which means they working on REST API, which is not true to some extent. Let’s take a look what exactly a REST API is.

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