Unpack the distribution. It will create a new folder/directory called “EJS_X.X” (where X.X stands for the current version, such as “EJS_4.2”), and that folder/directory will contain: the file “EjsConsole.jar”, and three folders/directories: “bin”, “doc”, and “workspace”.
Note when reinstalling EJS: If you need to reinstall EJS, or upgrade to a newer version of it, follow the same procedure to unpack the new EJS bundle. You may want to make a backup copy of the existing “workspace/source” folder/directory in the installation directory (not your personal one) if you did changes to the sample simulation files included in it. There is no problem in overwriting previous copies of the “bin”, “doc”, or other folders/directories under “workspace”, and the “EjsConsole.jar” file.
If you need to install Java, go to http://java.sun.com/javase/downloads. The current version of EJS requires JRE 1.5 or later. (Note that only the Java Runtime Environment [JRE] is needed; the Java Development Kit [JDK] contains JRE as well as other things which are not needed to run EJS.)
EJS and 64 bits Windows 7
We use both the 32 bit and 64 bit Java VM and they work fine. In our installation, when one double clicks on a jar file, the 32 bit VM is used. But when one starts EJS, the 64 bit VM is used. Getting Java 3D installed in both VMs in a pain in the rear end. The are two different versions of Java 3D and they don’t seem to find the correct VM so one may be forced to install some files by hand.