# Java ME Page

Select the Java ME category from the left pane of the properties dialog. The signing properties page for MTJ looks like the following:

Property items:

Item | Contents
--- | ---
JAD/JAR file name | The default JAD/JAR file names are based on the project name, if you want to configure them to your own names, you can set them here.

Configurations

The Configurations section manage configurations of your project. The active configuration contains the device the project is compiled against, and also the default device used when launching the MIDlets in the project. See more information at configuration document.

When active configuration changes, the contents of your project are automatically recompiled. Thus, if you build a project using the MIDP 2.0 platform and then change to a MIDP 1.0 platform definition, your project may no longer compile because of references to classes, methods or constants not present in the MIDP 1.0 definition.