If you access the Web server containing your JAR and JAD files with your handset, you may find that the JAD file is delivered to the phone as only a text file with its contents displayed as normal text. This indicates that your Web server needs to be configured.
You need to associate specific MIME types to the ".jar" and ".jad" extensions so that the Web server can tell the client which kind of content to expect. In apache, you add the following two lines to the httpd.conf configuration file:
AddType text/vnd.sun.j2me.app-descriptor .jad
AddType application/java-archive .jar
You then restart the server and point your handset to the URL where your .jad file resides.