I am preety sure that everybody who have Motorola E2 figured it our already, but we will post that article anyway. Installing java applications(midp2 jar files) is very simple. All you have to do is to:
1. Copy the jar file that you wish to install on your flash card.
2. Via the phone go to "File Manager" and browse to that file
3. Just start the file and it will ask you to install it in the phone or memory card.
4. On completion you will see the application on your "desktop"

Warning: By installing the application that way I saw that my .jar files are disappearing from the memory card after I install them. So always keep a copy on your computer. I am preety sure that you don't want to loose them :)