Squeezing the last bit out of RPC GWT

My latest web project [1] is setting up a real estate site in Indonesia with GWT. While the number of internet users grow at an astonishing rate, much of the internet connectivity is achieved through slow dial ups or mobile connections. Thus the primary technical goal was keeping network payload to a minimum. GWT RPC … Continue reading Squeezing the last bit out of RPC GWT →

ID trouble with multiple Hibernate entities on the same table

Just a while ago I ran into a case where Hibernate would auto generate a wrong database schema when two entities were mapped on the same table. The good news: it's my fault and not a bug. The better news: here's an account of how to avoid it. Let's assume a mutable entity A mapped … Continue reading ID trouble with multiple Hibernate entities on the same table →

A counterintuitive relation between CPU and memory usage

Continuing my tests on low-end server environments, I recently set up a stress test of a load balanced tomcat webapp. Part of that tests consist in reducing the available memory for the webapp (JVM -Xmx switch) and see how low it could go before negatively affecting performance. It's common knowledge that once available memory runs … Continue reading A counterintuitive relation between CPU and memory usage →

Running a java webapp in a VPS

The market is swarming with cheap Virtual Private Server (VPS) or Virtual Dedicated Server (VDS) offers [1] these days, and the specs don't look bad: you can get as much as 2GB RAM, 50GB storage space and a double core 2GHz CPU for less than 10$ / 8€ and nearly unlimited traffic. That's ideal for … Continue reading Running a java webapp in a VPS →