Some programs require Oracle Java to run, and might not work properly with OpenJDK. As of the writing of this, Aptana Studio does not support OpenJDK, and as such using it anyway may lead to instability.
To check which version of Java you are currently using, type java -version into a terminal and hit enter, doing this should output something like:
java version "1.8.0_05" Java(TM) SE Runtime Environment (build 1.8.0_05-b13) Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)
Installing Oracle Java
The easiest way to install Oracle Java is by typing the following commands in a terminal window:
sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java8-installer
Typing this will install Oracle Java 8 automatically, simply replace the "8" with "7" if you want to install Java 7 instead. I.e.
sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java7-installer