I guess PhpStorm does not love OpenJDK

OpenJDK Runtime Environment (IcedTea6 1.9.10) (6b20-1.9.10-0ubuntu1~10.04.2)
OpenJDK Client VM (build 19.0-b09, mixed mode, sharing)
WARNING: You are launching IDE using OpenJDK Java runtime

THIS IS STRICTLY UNSUPPORTED DUE TO KNOWN PERFORMANCE AND GRAPHICS PROBLEMS

NOTE: If you have both Sun JDK and OpenJDK installed
please validate either WEBIDE_JDK or JDK_HOME environment variable points to valid Sun JDK installation

Ubuntu Sun (Oracle) Java Installation Guide

sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner"
sudo apt-get update
aptitude install sun-java6-jdk
sudo update-alternatives --config java