JavaExp: Java and Open Source Technology

Recently I found interesting issue regarding JVM and Linux Swapiness. I was getting java out of memory while compiling my Java application. I have 8GB/Linux, and I was getting Java out of memory while compiling it alone (Without any other memory intensive job), also the overall build time was rediculously high. I googled and tried some tricks on the machine, after that my build time was significantly better and  most importantly, I did not get any out of memory from JVM. What I did is that I set the swapiness of the system to 10 from 60. Swapiness is a value between 0 to 100 and it's a parameter to the linux kerner to take decision on how aggressively to take processes out of the RAM to Swap Space in the Hard disk. Swapiness with 0 tells the kernel to avoid using Swap as far as possible, but it does not mean Swap wont be used at all. Swapiness with value 100 tells the kernel to use Swap space aggressively. You can check swapiness of your linux system using the followi...

Recently I needed to print a receipt with Barcode. But the particular webpage was not showing the Barcode. I googled and found a very helpful page and I followed the steps and then I was able to achieve my goal. The link I am talking about is http://www.cb1.com/~john/notes/fedora-font-install.html . I followed the first option. First I donwloaded the font library and then installed using kfontview. type kfontview from the command line. if kfontview is not available then install it by typing yum install kdebase  from the command line. From the kfontview window, open the font you have downloaded. Click on the "Install". Thats all , now close all your browse instances and again open the page with Barcode . You should be able to view it properly