Do you want to know what is the best investment you can make with your time and money? Knowledge As a software developer you should be constantly acquiring new skills. This is the best way to advance your career and enjoy the rewards (monetary, emotional etc.). Towards that direction you should be reading books, devouring technical articles and staying informed ...

When an application developer or architect tasked with exploring the possibilities that containerized applications offer, nothing is easier than the Red Hat Container Development Kit (CDK). The Red Hat CDK has all the Cloud tooling you need for your local OSX, Linux or Windows environment and it has a few containers pre-configured for you to explore. Last week this project ...

“The decline of Stackoverflow” is now trending on reddit, and I started this post as a comment in the thread, but it got too long. I’m in the 0.01% (which means rank #34) but I haven’t contributed almost anything in the past 4 years. Why I stopped is maybe part of the explanation why “the decline of stackoverflow” isn’t actually ...

This tutorial describes how to implement IoT push notifications. Using IoT push notifications, we can send notifications to other devices. In this case, we want to send an IoT push notifications from a smart object (like Arduino MKR1000) to a mobile smartphone (i.e. Android smartphone). This project integrates different eco-systems: IoT and Android. This project can have several implementations: for example, ...

So, you want to stay on the leading edge of technology, but feel overwhelmed by all the moving parts. You’re in luck! This is where jHipster shines. If you like the Ruby on Rails or Grails approach to getting an application up-and-running in a hurry, then this may be the right fit for you. jHipster aims to make setting-up an ...

Introduction WireMock is a mock server for HTTP-based APIs. Some might consider it a service virtualization tool or a mock server. It enables you to stub out an API or other external dependency you depend on to expedite local development. It supports testing of edge cases and failure modes that the real API won’t reliably produce. It also is useful ...

In a previous post we used DynamoDBMapper in order to map DynamoDB Tables into Java objects. When it comes to insert, our actions are pretty much the same but with a more convenient way. In order to insert an item all you have to do is to persist an object using the object mapper In our case, we will create ...

Apache Drill is an engine that can connect to many different data sources, and provide a SQL interface to them. It’s not just a wanna-be SQL interface that trips over at anything complex – it’s a hugely functional one including support for many built in functions as well as windowing functions. Whilst it can connect to standard data sources that ...

Previously we created DynamoDB Tables using Java. For various databases such sql databases or nosql there is a set of tools that help to access, persist, and manage data between objects/classes and the underlying database. For example for SQL databases we use JPA, for Cassandra we use MappingManager. DynamoDBMapper is a tool that enables you to access your data in ...

Over the years of performance monitoring with Plumbr I have faced hundreds of performance issues caused by resource leakages. In this post I would like to describe one of the simplest ways to approach resource clean-up and avoid the problem. Let me first describe the problem by using a movie player application as an example. The primary feature for such an ...

In this week’s Whiteboard Walkthrough, Stephan Ewen, PMC member of Apache Flink and CTO of data Artisans, describes a valuable capability of Apache Flink stream processing: grouping events together that were observed to occur within a configurable window of time, the event time.                 For other related resources: Download the O’Reilly book Introduction to ...