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OpenMap Tutorial 5 – 3-tier GIS application

1. Introduction Welcome to the 5th tutorial of the OpenMap series of Tutorials.  OpenMap is a free open source Java GIS library. Here is a list of previous tutorials: In the first tutorial we created a basic OpenMap GIS application that displays a map with one shape layer, loaded from the filesystem, inside a JFrame. That tutorial was based on ...

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Lombok, AutoValue, and Immutables

I liked Brandon‘s suggestion of a blog post comparing Project Lombok, AutoValue, and Immutables and this is a post that attempts to do that. I have covered Project Lombok, AutoValue, and Immutables individually with brief overviews, but this post is different in that it highlights the similarities and differences between them. Lombok, AutoValue, and Immutables share quite a bit in ...

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Functor and monad examples in plain Java

This article was initially an appendix in our Reactive Programming with RxJava book. However introduction to monads, albeit very much related to reactive programming, didn’t suit very well. So I decided to take it out and publish separately as a blog post. I am aware that “my very own, half correct and half complete explanation of monads” is the new ...

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A Simple Web App with Spring Boot, Spring Security and Stormpath – in 15 Minutes


Building Identity Management, including authentication and authorization? Try Stormpath! Our REST API and robust Java SDK support can eliminate your security risk and can be implemented in minutes. Sign up, and never build auth again! UPDATE: We recently released a revision to our Stormpath Spring Security integration. You no longer have to inherit from a special Stormpath security configurer adapter. ...

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4 Amazing Courses to Boost your Programming Career

Being a software developer today means that you need to stay ahead of the technology trends and always be acquiring new skills. This is the most effective way to advance your career and enjoy the rewards that come with that (monetary, emotional etc.). For this reason, we have hand-picked 4 top-notch courses we are certain you will enjoy. At the ...

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Things Geeks Should Know About LinkedIn

As much as LinkedIn seems to be turning into the worst parts of Facebook, flooded with tired memes that include phrases like “Only geniuses will get this math problem correct” or “Don’t scroll past without saying AMEN!“, having a LinkedIn profile is still generally considered a good idea for technologists. It can store business contacts in one convenient place, help ...

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Java 9 Additions To Stream

Java 9 is coming! And it is more than just Project Jigsaw. (I was surprised, too.) It is bringing a lot of small and not-so-small changes to the platform and I’d like to look at them one by one. I’ll tag all these posts and you can find them here. Let’s start with … Streams Streams learned two new tricks. ...

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Top 10 Questions about Apache Spark on the MapR Data Platform

In the last few weeks, we’ve seen a lot of activity and momentum centered on Apache Spark. At the Spark Summit in San Francisco, we announced an enterprise-grade Spark distribution that runs on the MapR Platform, and we received a lot of interest at this event. Customers are flocking to Spark as their primary compute engine for big data use ...

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Product Owners and Learning, Part 2

In Part 1, I talked about the way POs think about the big picture and the ranked backlog. The way to get from the big picture to the ranked backlog is via deliverables in the form of small (user) stories. See the wikipedia page about user stories. Notice that they are a promise for a conversation. I talked about feature sets ...

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