nikkatsa – Nikos Katsanos Blog

Uncategorised

Netty Websocket SSL

This is a small guide on how to create a Netty Websocket client/server application, communicating over SSL(wss). This guide showcases how to use JKS keystores/truststores, as they are the most common way of storing private keys and certificates in the Java world. This guide will show: How to create a…

Posted on 9th January 20229th January 2022 by nikkatsa

Java

Building A Logo Turtle App With Antlr And JavaFX

This post is about building a very simple application, implementing a subset of the Logo Programming Language along with a UI that visualizes the Logo programms entered by users.The technologies used were Antlr for creating a parser for a subset of the Logo rules and also JavaFX for creating a…

Posted on 6th June 20206th June 2020 by nikkatsa

c

Brushing Up My C. Building A Unix Domain Socket Client/Server (PART II)

I described in this previous blog post how to build a simplistic Unix Domain Socket client/server application.The disadvantage with that approach is that the server can only handle one connection at a time (i.e. is not concurrent). This blog post explains how this can be improved by using mechanisms like…

Posted on 24th May 202024th May 2020 by nikkatsa

c

Brushing Up My C. Building A Unix Domain Socket Client/Server (Part I)

I haven't really done much C in my professional career. There were a couple of times that I had to look into some C code, but not really create any kind of system in C. Most of my interaction with the C programming language dates back to university times.I always…

Posted on 23rd May 202023rd May 2020 by nikkatsa

Productivity

Migrating Modules/Directories Between GIT Repos

Disclaimer: I am not very good at using Git. The vast majority of time I just need to use a tiny subset of its features, and most likely my usage of Git resembles how I was using SVN in the past. Hence this post is actually a collection of resources…

Posted on 11th April 202011th April 2020 by nikkatsa

Java

For Loops, Allocations and Escape Analysis

For Loops, Allocations and Escape Analysis For Java applications in certain domains it is truly important that the creation of objects/garbage stays at a minimum. Those applications usually cannot afford GC pauses, hence they use specific techniques and methodologies to avoid any garbage creation. One of those techniques has to…

Posted on 8th March 20208th March 2020 by nikkatsa

Java

Java, The Cost of a Single Element Loop

In quite a few cases I have seen myself designing code with listeners and callbacks. It is quite common for a class that emits events, to expose an API to attach listener(s) to it. Those listeners are usually stored in a data structure (see List, Set, Array) and when an…

Posted on 27th October 201927th October 2019 by nikkatsa

Productivity

Managing JDKs in MacOS

With the increasing number of JDK builds and the more frequent release candence, I found it hard to keep track what I had installed in my MacOS and switch between them on the fly. Even in 2019 my preferred version of Java is 1.8, probably because this is the version…

Posted on 13th October 201913th October 2019 by nikkatsa

Java

Identifying a high-CPU Java Thread

High CPU utilization Java application Every now and then we find ourselves in situations when a single Java process is consuming a high percentage of CPU. After investigating and ruling out high CPU because of continuous GC cycles or other pathogenic reasons, we find ourselves in a situation that we…

Posted on 3rd March 20199th March 2020 by nikkatsa

linux

Vim For Developers

Introduction I use Vim quite often in my day to day activities. I do not use it to write code on it, but I tend to find myself logged into a linux host, where I need to edit or update files. Vim is my editor of choice for doing that.…

Author: nikkatsa

Uncategorised

Netty Websocket SSL

Posted on 9th January 20229th January 2022 by nikkatsa

Java

Building A Logo Turtle App With Antlr And JavaFX

Posted on 6th June 20206th June 2020 by nikkatsa

c

Brushing Up My C. Building A Unix Domain Socket Client/Server (PART II)

Posted on 24th May 202024th May 2020 by nikkatsa

c

Brushing Up My C. Building A Unix Domain Socket Client/Server (Part I)

Posted on 23rd May 202023rd May 2020 by nikkatsa

Productivity

Migrating Modules/Directories Between GIT Repos

Posted on 11th April 202011th April 2020 by nikkatsa

Java

For Loops, Allocations and Escape Analysis

Posted on 8th March 20208th March 2020 by nikkatsa

Java

Java, The Cost of a Single Element Loop

Posted on 27th October 201927th October 2019 by nikkatsa

Productivity

Managing JDKs in MacOS

Posted on 13th October 201913th October 2019 by nikkatsa

Java

Identifying a high-CPU Java Thread

Posted on 3rd March 20199th March 2020 by nikkatsa

linux

Vim For Developers

Posted on 24th February 201924th February 2019 by nikkatsa