I know the Impression supports Java, but it says unsupported file type when I attempt to open a .jar file type I put on the phone. I wonder if I need to convert it to a different file type.
The most common mistake that beginning Java programmers make when trying to write an application for a mobile device is using the wrong variant of Java. Java has three variants. The most common variant is Standard Edition (SE). There is also an Enterprise Edition (EE). The variant required for mobile devices is Micro Edition (ME).