Sojjwal Kelkar

Database integration tests for a Spring application

Jan 12, 2019 | 6 minutes Java

Suppose you are tasked with writing tests for a Spring and Hibernate application. This application uses a mix of native queries, HQL or entity associations to fetch data from the … [Read more]

The small pleasures of programming

Sep 23, 2018 | 2 minutes Coding is fun

It’s not just pulling off a complex engineering feat that makes programmers love their jobs. There are small pleasures to be had even in your day to day tasks, if you look for … [Read more]

Representing natural numbers in lambda calculus

Nov 8, 2017 | 7 minutes Functional Programming Coding is fun

One of the joys of reading SICP is that apart from the main subject matter, we come across many tangential topics that are interesting in their own right. One such topic is … [Read more]

Using thread dumps to analyse deadlocks

Oct 14, 2017 | 2 minutes Java

In a multi-threaded Java application, a deadlock occurs when two threads wait forever attempting to acquire locks that are held by each other. Here’s a simple example to simulate a … [Read more]

Setting up a JavaScript project in 2017

Jan 14, 2017 | 8 minutes JavaScript

Creating a front-end JavaScript project can be a daunting task due to the sheer volume of choices available while deciding the tech stack. First, you need to decide the JavaScript … [Read more]

Hystrix – a simple use case

Dec 5, 2016 | 2 minutes Microservices

Hystrix is a fault tolerance library that is very useful for managing failures in a distributed environment like microservices. Suppose we have a service A dependent on service B, … [Read more]

Running time intensive operations in parallel with RxJava Observables

Sep 1, 2016 | 4 minutes Java

Recently I delved into the RxJava library. In this post I will demonstrate how RxJava Observables can be used to execute two long running tasks in parallel, so as to reduce their … [Read more]

In case of any query, revert back to me

Aug 1, 2016 | 1 minutes Cartoons

If you have ever worked in an office in India, you would have encountered the phrase “revert back” at the end of official emails. When people ask you to “revert back”, … [Read more]

Logging with Spring AOP

Feb 12, 2016 | 3 minutes Java

Aspect oriented programming (AOP) is a way of separating the business login in your code from cross cutting concerns. What is a cross cutting concern? Analogy time. A typical house … [Read more]

Memory profiling – simple examples

Feb 4, 2016 | 5 minutes Java

Recently I have been trying to learn different memory profiling tools to monitor Java applications. I have looked into the command line tools that are shipped as part of JDK like … [Read more]