MicroEmulator explained

Logo Size:	220 px
Other Names:	MicroEMU
Author:	Bartek Teodorczyk
Developer:	Bartek Teodorczyk, Vlad Skarzhevskyy
Released:	^[1]
Discontinued:	yes
Latest Release Version:	2.0.4
Latest Release Date:	^[2]
Latest Preview Version:	3.0.0-SNAPSHOT.112
Latest Preview Date:	^[3]
Repo:	github.com/barteo/microemu
Programming Language:	Java
Genre:	Emulator
License:	GNU Lesser General Public License version 2.1; Apache License version 2.0
Website:	microemu.org

MicroEmulator (also MicroEMU) — is a free and open-source platform independed J2ME emulator allowing to run MIDlets (applications and games) on any device with compatible JVM. It is written in pure Java as an implementation of J2ME in J2SE.^{[4] [5]}

History

In November 2001, MicroEmulator project has been created on SourceForge.

On 31 March 2006, MicroEmulator version 1.0 has been released.

In November 2009, project moved to code.google.com, and after Google closed it, development moved to GitHub.

On 10 January 2010, the last stable version 2.0.4 has been released.

On 24 May 2013, the last preview version 3.0.0-SNAPSHOT.112 has been released.

After 2014, MicroEMU technology has been acquired by All My Web Needs company and all the MicroEmulator's docs and binary builds has been removed from the official site.^{[6] [7]}

All sources and binary previously released on SourceForge, Google Code and GitHub preserved as open-source, but development stalled since then.

Features

• Supports loading MIDlet from JAD or JAR file (locally stored or remotely accessed via URL)
• Supports various Java APIs and JSRs (Java Specification Requests):
  • MIDP 2.0 (JSR 118)
  • CLDC 1.0 (JSR 30)
  • CLDC 1.1 (JSR 139)
  • Generic Connection Framework API (GCF)
  • File Connection and PIM API (JSR 75)
  • Bluetooth API (JSR 82)
  • Wireless Messaging API (WMA, JSR 120)
  • Multimedia API (MMAPI, JSR 135)
  • Location API (LAPI, JSR 179)
  • Record Management System API (RMS)
  • LCDUI, Nokia and Siemens UI APIs
• Platform independent (Linux, Mac OS, Windows, etc.)
• Works with different GUI libraries (Swing, SWT, etc.)
• Supports insert PC clipboard text into MIDlet's text input fields (but not vice-versa; useful if need to input case sensitive text string or special characters in MIDlet)
• Supports control MIDlet via on-screen (virtual) or real keyboard keys, touch screen and mouse gestures, mouse scroll wheel and keys (also allows remap keys' scancodes, see "Skin, screen and window size configuration" section bellow)
• Screencast recording as GIF animation
• Record Store Manager (logs MIDlet's internal system calls to RMS API)
• Log console (logs for debugging MicroEmulator and MIDlet)
• Show mouse cursor position in MIDlet screen coordinate system
• Allows control network access and setup proxy for network connections^{[8] [9]}
• Runs in headless mode
• Many CLI options

JSR lib loading

By default MicroEmulator does not loads all distributed JSRs; user should load it per launch via custom commands instead.^[10]

File system access

On initial startup MicroEmulator does not loads JSR 75 lib, and as a result MIDlets has no access to file system.

To grant access to file system do the next steps:

1. Run MicroEmulator for the first time and close it — it will create config2.xml file (on Linux, in ~/.microemulator/ folder)
2. Open this XML-file and add after </windows> section add <extensions> section with the next strings at the end and save it:^[11]

... org.microemu.cldc.file.FileSystem (where <folder> would be a root of the mounted files system to be recognized by MIDlet)

1. Launch MicroEmulator with loading JSR 75 lib;^[12] on Linux, use the next command via terminal (or add it to microemulator.desktop file):java -cp //microemulator.jar://lib/microemu-jsr-75.jar org.microemu.app.Main(on Windows use ; instead of : to separate path to lib to be loaded; to load more libs just add it each after each in a row)

After launch opened MIDlets would has access to <folder> content with read and wright permissions.

Java applet for Web

MicroEmulator allows convert any J2ME app into Java applet, that could be placed on web page. This feature used for demonstrating apps and games demos on vendors sites, but it requires JVM and Java Web Start plugin to be installed on user's PC or device.^[13]

Skin, screen and window size configuration

MicroEmulator allows interface customization with skins called "devices" (see "Options > Select device..." menu) and distributed with few "devices":

• Default device — phone with 176x220 color display and antialiased font
• Minimum device color — small phone with 128x128 color display and non-antialiased font
• Minimum device — small phone with 128x128 monochrome display and non-antialiased font
• Large device — large phone with 240x320 color display and antialiazed font
• Resizable device — full window resizible color display with antialiased font (could be forced to full screen kiosk mode)

Each "device" skin consist of XML-files, that stores definitions of window size, keys layout and assignations (according scancodes), text rendering options, etc. Optionally, skin could include image textures for "device" background and keys animation on key click and key relax. All files of "device" skin should be packed into ZIP or JAR, and its possible to include few "devices" into single package.^{[14] [15]}

Screen could be switched between portrait and landscape (rotated) orientation. Additionally its possible to show current MIDlet screen scaled (x2, x3 or x4) in a separate floating window.

Limitiations

• MicroEmulator lacks support for few Java APIs and JSRs often used in j2ME games (and implemented in other emulators and MicroEmulator forks):
  • Mobile 3D Graphics API (M3G 1.0/1.1, JSR 184)^{[16] [17]}
  • Scalable 2D Vector Graphics API (SVG, JSR 226)^[18]
  • Java bindings for OpenGL ES (JSR 239)
  • Mobile 3D Graphics API 2.0 (M3G 2.0, JSR 297)
  • Mascot Capsule 3D API
• Some MIDlets may require other JSRs, that are not availabale for MicroEmulator yet.
• For input Cyrillic characters it might require to use special "device" skin.^{[19] [20] [21] [22] [23]}

Ports and forks

Android

MicroEmulator has an official support for Android platform.^[24] Also it is possible to convert J2ME MIDlet JAR-package into standalone Android Apk-package.^[25]

J2ME Loader — is an enhanced fork of MicroEmulator for Android.

JL-Mod — is an enhaced fork of J2ME Loader with the Mascot Capsule 3D API support.^[26]

iOS

MicroEmulator has been ported to iOS, but it requires to use iOS jailbreaking technique to install it on iPhone or other iOS device.^{[27] [28] [29] [30]}

Mac OS

MicroEmulator officialy supports Mac OS, but there is also package in MacPorts repository.^[31]

Maemo

MicroEmulator has an official support for Maemo platform, and there is custom MicroEmulator devices skins (themed to Nokia S60 smartphones with 240x320 and 640x360 displays) made for Nokia N900.^{[32] [33] [34] [35] [36] [37] [38]}

Here is a command to launch MicroEmulator on Maemo with JSR 75 lib loaded, to grant MIDlets file system access:microemulator -libraryjars /opt/maemo/usr/share/microemulator/lib/microemu-jsr-75.jar

MeeGo/Harmattan

KarinME — is a MicroEmulator front-end launcher for MeeGo/Harmattan platform, with a GUI written in QML.^{[39] [40]}

mpowerplayer SDK

mpowerplayer SDK — is a freeware enhanced fork of MicroEmulator, initially created for MacOS as J2ME MIDP 1.0 emulator, later become a platform independed J2ME MIDP 2.0 emulator with own implementation of M3G (JSR 184) and SVG (JSR 226).^{[41] [42] [43] [44] [45] [46] [47]}

WMA (JSR 120) has been implemented for mpowerplayer SDK as an open-source library.^[48]

Development stalled after mpowerplayer SDK version 2.0.1185 release in 2007. ZIP of latest distribution package available for download from archived official website on Wayback Machine.

Usage

MicroEmulator as Opera Mini sandbox

• Web applet with Opera Mini MIDlet running inside MicroEmulator has been placed on Opera official website.^{[49] [50]}
• MicroEmulator used together with Opera Mini MIDlet to browse Internet via metered networks and slow mobile GPRS connection on netbooks (such as Asus Eee PC), low-end PCs and other mobile devices.^{[51] [52] [53] [54] [55] [56] [57] [58] [59] [60]}
• In some countries mobile network operators provided free traffic or very lowcost plan with unlimited traffic for Opera Mini and some social networks and services via its J2ME clients (like Facebook, Yandex Maps, etc.^{[61] [62] [63]}). Use of MicroEmulator together with Opera Mini or other app with free traffic plan allowed to browse Internet fully free on PC (with USB modem attached) at home or on netbook on the go.^{[64] [65] [66] [67] [68] [69] [70]}

MicroEmulator as J2ME SDK

• MicroEmulator, together with few MIDlets for programming directly on phone (J2ME SDK Mobile, Mobile BASIC,, etc.^{[71] [72] [73] [74] [75] [76]}), could be used as a fully complete J2ME SDK: it is possible to write MIDlet source code, compile and preverify Java class files, package all files and resources of MIDlet project into JAR with JAD, and then run built MIDlet for test and debug without even leaving MicroEmulator window.^{[77] [78]} The only external dependency is a JVM installed on PC or device to run Microemulator itself.
• MicroEmulator could be used as alternative to Sun's and Oracle's JavaME emulators for various desktop Java IDE's. For the Eclipse ititially there was opensource bridge plugin EclipseME created,^[79] but Eclipse 1.7 and later got own bridge plugin.^{[80] [81] [82] [83]}
• MicroEmulator available as org.microemu plugin for Apache Maven build automation tool.^[84]

Publications

• • • • • Book: Tavares . Andre Luiz Camargos . Proceedings of the 2008 ACM symposium on Applied computing . Valente . Marco Tulio . 2008-03-16 . ACM . 978-1-59593-753-7 . 1918–1922 . en . A remote display system for Java-based mobile applications . 10.1145/1363686.1364150 . https://dl.acm.org/doi/10.1145/1363686.1364150.
• RemoteME: Experiments in Thin-Client Mobile Computing . Victoria University (New Zealand) . 2009 . Thesis . en . Vipul . Delwadia.
• Book: Virkus, Robert . Mobile Developer's Guide To The Galaxy . 18 September 2009 . Enough Software GmbH + Co. KG . Bremen . 14-22 . Programming J2ME / Java ME Apps . PDF . https://web.archive.org/web/20091002000329if_/http://www1.j2mepolish.org/downloads/MobileDevelopersGuideToTheGalaxy.pdf . 2 October 2009.
• Book: Virkus, Robert . Mobile Developer's Guide To The Galaxy . 15 October 2009 . Enough Software GmbH + Co. KG . 2nd Extended . Bremen . 21-29 . Programming J2ME / Java ME Apps . PDF .
• Vávra . David . GPS game for mobile framework Locify . 10 June 2009 . BA Thesis . .
  • Learning API mappings for programming platforms . New Brunswick . Rutgers University - Graduate School . 2013 . Yogesh . Padmanaban.
• Book: Gokhale . Amruta . 2013 35th International Conference on Software Engineering (ICSE) . Ganapathy . Vinod . Padmanaban . Yogesh . May 2013 . 978-1-4673-3076-3 . 82–91 . Inferring likely mappings between APIs . 10.1109/ICSE.2013.6606554 . https://ieeexplore.ieee.org/document/6606554.
• Book: Virkus, Robert . Mobile Developer's Guide To The Galaxy . February 2015 . Enough Software GmbH + Co. KG . 15th . Bremen . 82-90 . Java ME (J2ME) . PDF . B00BS6RIKU . https://web.archive.org/web/20150929180532/http://www.enough.de/index.php?id=mobile_developers_guide . 29 September 2015 . dead.

Video

• • Alan Bazan.

See also

• SquirrelJME^[85] (JavaME 8 VM for embedded device)
• KEmulator (J2ME emulator for Windows)
• FreeJ2ME (J2ME emulator for Libretro and RetroArch)
• ME2SE^[86] (J2ME APIs for J2SE, runs on Windows Mobile^[87])
• ScummVM
• DOSBox
• PyPy
• Python for S60

References

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2. Web site: Teodorczyk . Bartek . 2010-01-14 . MicroEmulator 2.0.4 has been released . 2024-08-12 . MicroEmu.
3. Web site: 24 May 2013 . Build 3.0.0-SNAPSHOT.112 · barteo/microemu@259e576. GitHub.
4. Web site: 2013-04-26 . MicroEmulator . 2024-08-12 . SourceForge . en.
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8. Web site: MicroEmulator - Frequently Asked Questions: Proxy . http://web.archive.org/web/20140207235151/http://microemu.org/faq.html#proxy . 7 February 2014 . microemu.org.
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43. Web site: MIDP 2 on Mac OS X is here ! . 2024-08-13 . justobjects.nl . en.
44. Web site: Mpowerplayer, Inc. Launches Unique "Try before You Buy" Platform for Mobile Java Games . 2024-08-13 . WebWire.
45. Web site: 12 January 2005 . Configuring the MobileSDK – IDEs Support (IntelliJ Platform) . JetBrains.
46. Web site: Eclipse Community Forums: DSDP - Mobile Tools for Java (MTJ) » MTJ 0.9 RC1 Available . www.eclipse.org . en.
47. Web site: Brian - documentation . 2024-08-13 . trbtr.de . On mpowerplayer.com there are 2 ways to try J2ME-Software without a mobilephone. Both of them work on any platform that has a working Java installation and they are free..
48. Web site: 2005-11-18 . WMA support for the mpowerplayer SDK freecode Japanese information - OSDN . 2024-08-13 . osdn.net . en.
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50. Web site: Opera Mini simulator . https://web.archive.org/web/20130223013035/http://www.opera.com/developer/tools/mini/ . 2013-02-23 . 2024-07-23 . . en.
51. Web site: 3 April 2008 . Opera Mini on your PC . dead . https://web.archive.org/web/20120825092210/http://my.opera.com/community/blog/2008/04/03/opera-mini-on-your-pc . 2012-08-25 . My Opera.
52. Web site: Kleinschmidt . Lars . 29 March 2008 . Opera Mini - in 1280*1024! . dead . https://web.archive.org/web/20120919042233/http://my.opera.com/larskl/blog/2008/03/29/opera-mini-in-1280-1024 . 2012-09-19 . My Opera.
53. Web site: Dube . Ryan . 2011-07-13 . How To Use Microemulator To Use The Internet From Low-Bandwidth Rural Areas [Windows] ]. 2024-08-12 . MUO . en.
54. Web site: Mister Nobody . Пользуемся Opera Mini на субноутбуке или обычном компьютере . dead . https://web.archive.org/web/20080422225342/http://operafan.net/content/view/309/2/ . 2008-04-22 . operafan.net . ru.
55. Web site: Mister Nobody . Opera Mini на PC . dead . https://web.archive.org/web/20080412010946/http://www.myopera.net/opera_mini_pc.html . 2008-04-12 . myopera.net . ru.
56. Web site: Installing Opera Mini emulator locally . 2024-07-23 . sharovatov.github.io.
57. Web site: Bovens . Andreas . 2009-09-16 . Opera Mini 5 Beta Is Out . http://web.archive.org/web/20231111231218/https://dev.opera.com/blog/opera-mini-5-beta-is-out/ . 2023-11-11 . 2024-07-23 . . en.
58. Web site: 2009-02-02 . Настройка GPRS и установка Оперы Мини на Eee PC . 2024-07-23 . Хабр . ru.
59. Web site: maemo.org - Talk - View Single Post - Opera Mini 4.1 for Maemo . 2024-08-13 . talk.maemo.org.
60. Web site: Kumar . Saurabh . 10 January 2010 . Browse the web with lightning fast speed using this trick . techpp.com.
61. Web site: 2 June 2011 . Kyivstar and Yandex make traffic in mobile Yandex.Maps free . SudoNull . en.
62. Web site: Автоцентр . 2011-06-02 . Яндекс.Карты теперь с бесплатным трафиком для абонентов «Киевстар» – останні автоновини на Автоцентр.ua . 2024-08-14 . Автоцентр . ru.
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64. Web site: Фурман . Олексій . 2014-09-04 . Opera Software и «Киевстар» заключили соглашение о стратегическом партнерстве Creativity Ukraine . 2024-08-14 . ru.
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66. Web site: 100 тыс. абонентов «МТС Украина» воспользовались услугой «Безлимитный интернет с Opera Mini». 2024-08-14 . ko.com.ua . ru.
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72. Web site: Janino, Preverifier, JarBuilder - Скачать бесплатно . 2024-08-14 . seclub.org.
73. Web site: J2ME SDK Mobile - Скачать бесплатно . 2024-08-14 . seclub.org.
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76. Web site: Jasmin . 2024-08-14 . PS Мир смартфонов . ru.
77. Web site: says . Jane Andreas . 2009-02-16 . Creating deployable MIDlets with free software . 2024-08-13 . François' Weblog . en.
78. Web site: Eclipse Community Forums: DSDP - Mobile Tools for Java (MTJ) » Using ProGuard as preverifier with MicroEmu? . 2024-08-13 . . en.
79. Web site: 2012-12-08 . EclipseME . 2024-08-13 . SourceForge . en.
80. Web site: Boabby . Shug . Plugin for Java 2 Mobile Edition Development for Eclipse . http://web.archive.org/web/20070129022450/http://permalink.gmane.org/gmane.comp.ide.eclipse.eclipseme.user/350 . 2007-01-29 . gmane.org . Pure Java emulators (e.g. MicroEmu and MPowerPlayer).
81. Web site: Skerrett . Ian . 15 October 2008 . New Eclipse MTJ Release Eases Cross Platform Development for Mobile Java Applications The Eclipse Foundation . www.eclipse.org . en.
82. Web site: 16 October 2008 . Eclipse offers mobile development tools . Computerworld . en.
83. Web site: 2010-04-19 . DSDP Mobile Tools for Java Project . 2024-08-13 . SlideShare . en.
84. Web site: MVN Repository: org.microemu . mvnrepository.com.
85. Web site: Gawroriski . Stephanie . SquirrelJME: SquirrelJME . 2024-08-12 . multiphasicapps.net . en-us.
86. Web site: ME4SE . 2024-08-13 . kobjects.org.
87. Web site: Running me4se on PocketPC (WindowsCE) . 2024-08-13 . me4se.org.

External links

• Official website
  • • • • MicroEmulator on Google Groups
          • (includes collection of MIDlets for J2ME programming)