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Prime-UI, JAX-RS with Jersey and Gson on Oracle Cloud

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The Oracle Cloud is around everywhere these days. It had a rough start with Larry denying the need for a cloud for a very (too) long time and some very early announcements and a very bad availability after last year’s Open World nobody seems to be interested anymore. But for me it still has it’s hidden treasures and I believe ...

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Virtual Host + Nginx + Tomcat

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In my Virtual Host + Apache httpd server + Tomcat + mod_jk connector post has lots of comments. and i hope everyone like that. But problem is very difficult to install and configure the Apache httpd server with mod_jk connector. Recently i learned nginx. and i walked through the Nginx server as Load balancer. This post is same as Virtual ...

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Tomcat Clustering Series Part 5 : NginX as Load Balancer

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This is my fifth part of the Tomcat Clustering Series.[Check the video below for better understanding]. In this post we are going to discuss how to replace Apache http load balancer to Nginx as a load balancer. In these series we have 2 big setups needed for Tomcat Clustering Setup and configure the Load Balancer Configure the Session Replication in ...

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Your logs are your data: logstash + elasticsearch

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Topic of today’s post stays a bit aside from day-to-day coding and development but nonetheless covers a very important subject: our application log files. Our apps do generate enormous amount of logs which if done right are extremely handy for problems troubleshooting. It’s not a big deal if you have a single application up and running, but nowadays apps, particularity ...

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Common pitfalls in benchmarking

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Every once in awhile each and every one of us is trying to measure performance of certain parts of the code. It can be either a fully functional application measured against specific number of user transactions per minute or a microbenchmark. Which you have written to prove that your fellow developer is wrong. Especially in the latter case it is ...

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Implementing custom Future

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Last time we learned the principles behind java.util.concurrent.Future<T>. We also discovered that Future<T> is typically returned by libraries or frameworks. But there is nothing stopping us from implementing it all by ourselves when it makes sense. It is not particularly complex and may significantly improve your design. I did my best to pick interesting use case for our example. JMS ...

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Complex Numbers in Scala

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Overview I recently delivered an introductory talk about Scala at an internal geek’s event at SAP. In this talk, I used an example complex numbers class to illustrate important language concepts and features. In many respects, this is a classical example that can be found in many other introductory materials about Scala, for example in this Scala Tutorial for Java ...

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java.util.concurrent.Future basics

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Hereby I am starting a series of articles about future concept in programming languages (also known as promises or delays) with a working title: Back to the Future. Futures are very important abstraction, even more these day than ever due to growing demand for asynchronous, event-driven, parallel and scalable systems. In the first article we’ll discover most basic java.util.concurrent.Future<T> interface. ...

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