MIDlet

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Java ME application format

title: "MIDlet" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["java-device-platform", "mobile-software-programming-tools"] description: "Java ME application format" topic_path: "general/java-device-platform" source: "https://en.wikipedia.org/wiki/MIDlet" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Java ME application format ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/5/53/MMI_RATP.JPG" caption="MIDlet running in J2ME emulator"] ::

A MIDlet is an application that uses the Mobile Information Device Profile (MIDP) of the Connected Limited Device Configuration (CLDC) for the Java ME environment. Typical applications include games running on mobile devices such as smartphones with J2ME support and feature phones which have small graphical displays, simple numeric keypad interfaces and limited network access over HTTP.

The .jad file describing a MIDlet suite is used to deploy the applications in one of two ways. Over the air (OTA) deployment involves uploading the .jad and .jar files to a Web server which is accessible by the device over HTTP. The user downloads the .jad file and installs the MIDlets they require. Local deployment requires that the MIDlet files be transferred to the device over a non-network connection (such as through Bluetooth or IrDa, and may involve device-specific software). Phones that support microSD cards can sometimes install .jar or .jad files that have been transferred to the memory card.

Platforms

Mainly MIDlet applications and games developed for Series 40, Series 60, Nokia Asha and Sony Ericsson Java Platform.

Emulation

MIDlet can run using MicroEmulator app on any desktop PC with JavaSE and on Maemo. On Android devices via the J2ME Loader (MicroEmulator fork) application.

Other J2ME emulators also could be used with or without some limitations.

Restrictions

Unlike a Java applet, a MIDlet is limited to use of the LCDUI rather than the more familiar widgets of AWT and Swing. There are also restrictions on the size of .jar files and the number of concurrent HTTP connections based on the MIDP specification.

References

References

  1. Topley, Kim. (2002). "J2ME in a Nutshell". [[O'Reilly Media]].
  2. "Introduction to OTA Application Provisioning".
  3. "Deploying Wireless Java Applications".
  4. (2013-04-26). "MicroEmulator".
  5. (May 2024). "MicroEmulator for Maemo (N900) by Ruediger Gad".
  6. (2010-05-08). "maemo.org - package overview for MicroEmulator".
  7. (2012-06-10). "maemo.org - package overview for microemulator-s60-skin".
  8. Shakarun, Nikita. (2024-08-11). "nikita36078/J2ME-Loader".
  9. "J2ME Loader - Apps on Google Play".

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

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