JAD (file format)

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JBook application descriptor
Filename extension
.jad .jar
Internet media type
Developed bySun Microsystems, Inc.
Type of formatDescriptor file
StandardJava application

Java Application Descriptor (JAD) files describe the MIDlets (Java ME applications) that are distributed as JAR files. JAD files are commonly used to package Java applications or games that can be downloaded to mobile phones. Java applications enable mobile phones to interact functionally with online web services, such as the ability to send SMS messages via GSM mobile Internet or interact in multiplayer games. Some BlackBerry devices use JAD files for themes, while on some mobile phones without memory cards it is not possible to download any apps.

Recent midlets contain a manifest file in the JAR archive. This file contains much of the information stored in the JAD file, rendering it unnecessary in most cases.

JAD mime type[edit]

The MIDP2 specification instructs that web servers should serve JAD files with a MIME type of "text/vnd.sun.j2me.app-descriptor".[1] If this MIME type is not correctly configured, many phones will fail to install the MIDlet.


Manifest-Version: 1.0
Created-By: Apache Ant 1.5.1
MIDlet-1: Book Reader by TC, , br.BookReader
MIDlet-Name: BookReader
MIDlet-Vendor: tequilaCat
MIDlet-Version: 1.3.6
MicroEdition-Configuration: CLDC-1.0
MicroEdition-Profile: MIDP-1.0
MIDlet-Jar-Size: 24575
MIDlet-Jar-URL: bookreader.jar
TC-BookReader-Logging: true

See also[edit]


  1. ^ JSR 118 Expert Group, Mobile Information Device Profile for Java™ 2 Micro Edition, Version 2.1, May 26, 2006

External links[edit]