Collecting java.util.logging to log4j2

Everybody wants to write a log. And in Java everybody wants to write their own logging framework or at least use of the many different ones. Then someone comes up with logging framework framework such as SLF4J. OK but what was I about to say. As so many times, I had a piece of Java […]

Performance testing with InfluxDB + Grafana + Telegraf, Part 2

Previously I ran my performance test in a local test environment. However, the actual server should run in the Amazon EC2 cloud on one of the free tier micro instances (yes, I am cheap but it is more of a hobby project bwaabwaa.. 🙂 ). So I installed the server on my EC2 micro instance […]

Performance testing with InfluxDB + Grafana + Telegraf, Part 1

Previously I played around with ElasticSearch + Kibana, which was nice for visualizing some activities on my Minecraft server. I then proceeded to try the same for some server performance metrics data such as CPU and memory use (collected using some Python scripts I created with the psutil library). ES + Kibana are absolutely great […]

Serialization JSON/Avro/Protocol buffers

Introduction Recently I have been trying to figure out nice and effective approaches for serializing my data across different nodes. Sitting back in the rocking chair, I can recall how CORBA once upon time was supposed to be cool (it was binary and generated code I believe) but somehow was always oh so broken (only […]

Sending SOAP messages in Java without any libraries

Needed to send some SOAP requests in Android. There was no nice library available to do it all. Not that I would care for them much, SOAP is bloated, Java libraries are typically bloated, and combining the two probably gets obese. Anyway, how can I send SOAP messages with only the most basic methods? After […]

Installing JDK8 on linux (debian/ubuntu)

So how do I install JDK8 on debian etc these days when there seems to be some mess with Oracle licensing and linux package managers? Found some nice instructions at https://www.digitalocean.com/community/tutorials/how-to-manually-install-oracle-java-on-a-debian-or-ubuntu-vps To summarize: Download the .tar.gz file for linux from Oracle website such as http://www.oracle.com/technetwork/java/javase/downloads, and we unzip that to some nice and shiny directory. […]

Was playing around a bit with AngularJS Seems…

Was playing around a bit with AngularJS. Seems like a great way to structure your templates at client vs server-side. After playing around with Jersey and bunch of other Java REST frameworks, I finally decided to go with just a basic Servlet container and have that provide some JSON data over a REST style interface. […]

programmatic jdk logging configuration

something so wrong with all this being so hard.. so lets try to document a few words problem:how do you programmatically configure the JDK logging so you get two different log streams, one to standard output and another to a file? everything i tried was either outputting everything or nothing. trying to search for a […]

jetty nio issues

Trying lately to get Jetty to work with Jersey on my computers. getting those “Unable to establish loopback connection” and “Connection refused” errors. Googling this indicates it is a firewall issue but I had to try to debug anyway right.. So I tried to write some simple code to test if I had problems binding […]

Java wildcard classpath

Since JDK 6 you are supposed to be able to write a classpath like java -cp * foo.Bar which should set the classpath to contain every .jar ending file in the current directory. But if you do this, it gives you an error that main class “xxx” could not be found, where “xxx” equals the […]