java

CuriosityX: RDDs – The backbone of Apache Spark

Apache Spark, HDFS, Java, Scala, Spark, , , , , ,

In our last blog, we tried to understand about using the spark streaming to transform and transport data between Kafka topics. After reading that many of the readers asked us to give a brief description of RDDs in Spark which we used. So, this blog is totally dedicated to the RDDs in Spark. So let’s start with the very basic question that comes to our mind Continue Reading

Custom ErrorHandlers and Lagom

Java, Microservices, Play Framework, Reactive Application, Scala, Web Services, , , , , , ,

Hello everyone, it’s been quite a while now since I started working on Lagom(java) and it was only recently when I came across a scenario wherein I was required to override the ErrorHandler provided by Play in my Lagom microservice. As you all already know that Lagom is built on top of Play and Akka, so there will be times when we’ll be required to Continue Reading

Code Combat II : The Code Battle For The Vanguard Continues…

Akka, Apache Kafka, Apache Spark, Blockchain, Java, ML, AI and Data Engineering, Scala, , , , , , ,

“If you can dream it, you can do it. ”  -Walt Disney For some coding is a job. For some, it is an exercise. But for us folks here at Knoldus, it’s a Passion. So in order to bring a twist in the daily work schedule, Knoldus held an overnight Hackathon competition within the organization on 18th May 2018 which presented an opportunity for every Knolder(employees Continue Reading

Do you think your code is Perfect? Well, Think again.

Java, Scala, software, Testing, , , , ,

“Any fool can write code that a computer can understand. Good programmers write code that humans can understand.” – Martin Fowler “I can code.” I always say to myself. But do others think the same? Is my code good enough for people to understand? Do other people think “Damn I wish I could write such code.?” –  that’s the main question I always had in Continue Reading

Clean Code – Robert C. Martin’s Way

Java, Scala, , ,

Writing good code in accordance with all the best practices is often overrated. But is it really? Writing good and clean code is just like good habits which will come with time and practice. We always give excuses to continue with our patent non-efficient bad code. Reasons like no time for best practices, meeting the deadlines, angry boss, tired of the project etc. Most of Continue Reading

Exploring Java 10 using Docker

Functional Programming, Java, , , , , , , , , ,

On March 20, 2018, Java 10 was released and everybody wants to explore Java 10 but not everyone wants to change their development environment. So in this blog, we will be discussing how can we use Java 10 using Docker.

Get Rid of the Boilerplate in JAVA with Annotations @Lombok

Java, , , , ,

Hi all, we have been programming in Java for quite a while now and came across various scenarios such as those concerning the lines of code, redundant code boilerplate or programming style like moving from imperative style of coding to functional style etc., Java is quite verbose and will require a developer to often write significantly more code for the same task than the other Continue Reading

Concurrency API

Guide to Java 8 Concurrency API using Executors

Java, Scala, , , ,

Working with the Thread class in Java can be very tedious and error-prone. Due to this reason, Concurrency API was introduced back in 2004 with the release of Java 5 and then enhanced with every new Java release.The API is located in package java.util.concurrent. It contains a set of classes that make it easier to develop concurrent (multithreaded) applications in Java.  The executor services are one of the most Continue Reading

Knolx: The Hidden Mystery Behind Scala Functional Programming

Functional Programming, Scala, , , , , , , , , , , ,

Hello everyone, Knoldus organized a session on 25th January 2018. The topic was “The Hidden Mystery Behind Scala Functional Programming”. Many people attended and enjoyed the session. In this blog post, I am going to share the slides & video of the session. Slides:

Knolx: Guaranteed No Stress Baby Steps Using Akka Streams Part-II

Akka, Java, Scala, Streaming, , , , , ,

Hello everyone, Knoldus organized a session on 25th November 2017. The topic was “Guaranteed No Stress Baby Steps Using Akka Streams Part-II”. Many people attended and enjoyed the session. In this blog post, I am going to share the slides & video of the session. Slides:

Knolx: Guaranteed No Stress Baby Steps Using Akka Streams Part-I

Akka, Java, Scala, Streaming, , , , , ,

Hello everyone, Knoldus organized a session on 28th October 2017. The topic was “Guaranteed No Stress Baby Steps Using Akka Streams Part-I”. Many people attended and enjoyed the session. In this blog post, I am going to share the slides & video of the session. Slides:

Difference between Mockito and JMockit

Java, Scala, Testing, , ,

A Brief analysis on Mockito And Jmockit Mockito JMockit 1. We can achieve Static method/constructor mocking by the combination of Mockito with Powermock. 1. Static method/constructor can be mocked directly in JMockit. 2. The Mockito API contains several inconsistencies in the syntax used for invocations to mocked methods. In the record phase, we have calls like when(mock.mockedMethod(args))… while in the verify phase this same call Continue Reading

Developers Needs SDKMAN Not Super-Man

Apache Spark, Java, linux, Scala, Spark, , , , , , , , , , , , , , , , , , , ,

Every developer has pain for setup development environment to his/her machine with lots of the setups. Sometimes, the pain goes beyond while we need to test same application on multiple versions of SDKs or virtual machines. If you are a Mac user, you have the best option called brew installer. But if you are Linux user, your pain is unpredictable. We are JVM stack developers Continue Reading

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