Minecraft launcher

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Minecraft launcher
Current version


Development version




The Minecraft launcher is the login and downloader front-end to the stand-alone client. It is responsible for downloading the main Java packages, including minecraft.jar, which holds the code and resources of the game such as textures, and LWJGL. It also acts somewhat like a basic and easily bypassable copy-restriction by forcing the user to login to a paid account when running for the first time. It is possible to use the launcher to run versions of Minecraft from nearly any era, however some versions are still not included on the launcher, such as Indev, Minecraft 2.0 and any of the Beta 1.9 pre-releases. The current launcher is the sixth launcher for Minecraft, and the first that was built to automatically update itself.

Behavior[επεξεργασία | επεξεργασία κώδικα]

The login screen for launchers without previously logged-in users.

Every time the launcher is executed, it checks a specific directory where Minecraft stores its files called .minecraft. It checks a file called "launcher_profiles.json" for login credentials. If the file does not exist, is corrupt, or no user is logged in, the user must login with a valid premium account, otherwise the user will be directed to play the Demo version or purchase the game.

When logging in, the launcher will first try to verify the login. If a valid "launcher_profiles.json" file exists but there is no Internet connection, the launcher will offer a "Play offline" mode if a player was logged in when it was last closed. If the connection is successful, the launcher will then, depending on profile options, compare the latest version in the latest "versions" directory to the latest version reported by the server. If the selected version does not exist or the latest installed version is outdated when "Use latest version" is selected in the profile, the launcher will download all Minecraft components and Java binary files. It will also synchronize everything in the Assets folder (see Resource pack).

Finally, upon a successful update or installation, the launcher will execute the Minecraft jar (via "javaw.exe", Oracle's Java Virtual Machine executable.) It is possible however for there to be missing ".jar" files, in which case the launcher will attempt to replace the missing files automatically but will stop if there is no connection.

Currently, the Minecraft launcher supports 41 languages.

Features[επεξεργασία | επεξεργασία κώδικα]

Launcher[επεξεργασία | επεξεργασία κώδικα]

  • Manage multiple profiles (stored in "launcher_profiles.json"). Each profile can control:
    • Game version. Includes access to outdated development builds and previous releases. You can also add older/custom versions manually[1]. See this video for instructions.
    • Mojang account used to play the game
    • Command line arguments for Java (such as heap size)
    • Game Directory (where the game files are saved on disk)
    • Edit profile pictures or custom made ones
  • The launcher doesn't store your password locally. Instead of this, it uses a 'refresh token'.
  • The launcher does not support multiple instances, whereas the game does.
  • Automatic updates for launcher.
  • Ability to update libraries, such as LWJGL.
  • Offline mode. (The first time launch requires an Internet connection to download required resources)
  • 57 Languages avaliable
  • Crashes can be reported to Mojang, through Hopper.
  • Crashes are indexed through a database for information on how to fix the issue.
  • Launcher Settings.
  • Switching Accounts or logging off.
  • Changing Skins.
  • Downloads servers on versions.
  • Help button.
  • Tiny Creeper face button (when you click it, it glows but it does nothing).
  • Shows you the launcher version information when you click the launcher version.

Time Machine[επεξεργασία | επεξεργασία κώδικα]

A profile with Alpha and Beta versions enabled

The Minecraft launcher has the ability to play old Alpha and Beta versions of the game. Currently, snapshots, Alpha, Beta, and all Release versions are available to play. Four Pre-classic versions, four Classic versions, and an Infdev version are already added under the names "old-alpha version".[2] However, Indev is still missing.

Progress *note: as of 1.10.2

To enable the old versions either click the "Launch Options" then turn the "Historical Versions" on then open your profile or make a new one, next select any of Alpha/Beta versions on the Version box then click "Save" button.

However, these versions are very out of date and may be unstable. Any bugs, glitches, missing features, or crashes that result from instability will never be resolved as only later versions are supported. Mojang strongly recommends that you play them in separate directories than your other saves to avoid corruption.[3]

Skins[επεξεργασία | επεξεργασία κώδικα]

Skin options in the launcher

You can change or add your custom skin within the Minecraft Launcher. To change or add your skin click the "Skins" button, then click the "Browse" button to navigate through your file system for your skin file. The file must have a resolution of 64×64 in order for the launcher to accept it as a skin file. Additionally, the skin file must be in a .png format. After you have found the skin file, click the "Save" button to confirm your in-game skin.

  • You can reset your skin to the Steve or Alex defaults by clicking "Click to reset".
  • You can choose between player models - either Classic (Steve) or Slim (Alex).

Profiles[επεξεργασία | επεξεργασία κώδικα]

When you open the launcher for first time, it creates a profile that selects the latest version of Minecraft - it cannot be removed.

However, you may create a game profile of your own in the launcher. Click on the "Launch Options" button, then click "Add New" to create one. After this, name your profile as you want it. If you leave it, it will be named "Unnamed Configuration". Then, optionally, select a profile picture from the launcher or a custom one. However, it must be a 128×128 .png picture. Select the version you wish to play, and click "Save" to confirm your profile. If you want to edit a profile, just click it. The same applies if you wish to delete a profile. Simply click the profile you want to delete and then click the "Delete [X]" button to remove it.

  • Αρχείο:2016LauncherProfileSettings.jpg
    Profile settings in the launcher
    You can download server versions by clicking "Download Server".
  • If you want to resize the game, turn "Resolution" on to change the game window size.
  • You can turn "Advanced Settings" on to show more profile options.
  • If you want to change the .minecraft file path, turn the on the "Game directory" option. Now, navigate to the folder where you wish to relocate the .minecraft folder. You can also open the Minecraft profile by clicking the green arrow-shaped "Go to folder" button.
  • If you turned "Snapshot Versions" on, it creates a "Latest Snapshot" profile automatically.

Command Line usage[επεξεργασία | επεξεργασία κώδικα]

MinecraftDev.jar (all systems):

java -cp Minecraft.jar net.minecraft.bootstrap.Bootstrap <username> <server:port>

As of the launcher released with Minecraft 1.6, there are other commands for the launcher. These are shown if you do

java -jar Minecraft.jar -help

History[επεξεργασία | επεξεργασία κώδικα]

1.0.0Initial release. In this version users can choose not only the current version but also Infdev.
The client requires an internet connection on the first run and for updates, but after that the game supports playing offline.
Command line arguments are accepted to launch the game. Using the format java -cp Minecraft.jar net.minecraft.LauncherFrame username password will allow login without joining a server, while the format java -cp minecraft.jar net.minecraft.LauncherFrame username password serveraddress:portnumber allows joining a server.
1.2.2Command line arguments format changed.
1.3Released in February 21, 2011.[5] A technical sneak preview was published by Notch on February 18, 2011.[6]Added capability of automatic login to the game and/or server by command line arguments.
Added smarter update system that only updates changed files, prompts the user to update, allows HTTPS logins for a more secure connection, and offers general UI improvements.
Link to the Minecraft install directory for easy access.
Add Force Update button under the Options dialog.
The launcher also featured an inline "changelog" via a Tumblr called MCUpdate, and supports command-line arguments.[4]
Added the new Minecraft logo.
Added official links, community links and Mojang on Twitter links.
Official release
1.2.1Properly selects 64-bit Java installations for Mac OS X users.[7]
1.3.2Added ability to launch demo mode for non-premium users.
1.6.113w16aNew launcher added. See launcher history below.

Minecraft Launcher[επεξεργασία | επεξεργασία κώδικα]

Launcher version Release date Summary of changes
2.0.581-stage January 18, 2017
  • Added a launcher version information tab.
2.0.580-stage (macOS) January 18, 2017
  • Added a launcher version information tab.
2.0.511-stage (macOS) January 3, 2017
  • Changed font from the Minecraft default to Segoe UI.
2.0.510-stage January 3, 2017
  • Changed font from the Minecraft default to Segoe UI.
  • Fixed a bug where the resolution was 2304×1202 regardless of launch option or window size.
2.0.497-stage December 29, 2016
  • Added more languages.
2.0.490-stage December 27, 2016
  • Unknown
2.0.465-stage (macOS) December 8, 2016
  • Unknown
2.0.464-stage December 8, 2016
  • Unknown
2.0.455-stage December 7, 2016
  • Unknown
2.0.447-stage December 6, 2016
  • Fixed a crash when you launched any minecraft.jar except for "1.11 Latest release" or lower.[citation needed]
2.0.429-stage December 1, 2016
  • Unknown
2.0.425-stage November 29, 2016
  • Unknown
2.0.414-stage November 28, 2016
  • Fixed a bug where the Launcher could get stuck on 'Loading...' everywhere.[8]
2.0.387-stage November 25, 2016
  • Added language selection
1.6.70 November 17, 2016
  • Unknown
2.0.320-stage November 4, 2016
  • Unknown
2.0.282-stage November 2, 2016[9]
  • Now supports running multiple instances of Minecraft at the same time
  • Can now be kept open while the game is running
  • Now backs ups "launcher_profiles.json" before migrating settings to new launcher
  • Made launch options slightly smaller
  • The button to add a new launch option is now at the top of the list
  • "Keep launcher open" and "Show game log" are now separate settings
  • Multiple bug fixes:
    • Fixed running modded versions
    • Resolution setting should now work properly
    • Fixed an issue where opening the game directory would give an error message even when it worked
    • Pressing Del in input fields no longer removes the rest of the line
    • Pressing Tab ↹ on the news page no longer messes with the news carousel
    • Fixed a crash that sometimes happened when the game closed
    • Selecting input with your mouse and hitting backspace on the keyboard should now properly delete the input
    • The version information page no longer selects all text when you click it
1.6.69 October 26th, 2016
  • Unknown
2.0.164-stage[10] October 26th, 2016
  • New launcher iteration for testing initially for Windows and macOS
  • Runs as a native application that no longer requires Java
  • Interface redesign
1.6.66 October 24th, 2016
  • Now warns the player when their profile has been opened in the new launcher.
1.6.61 March 3rd, 2016
  • Game Session ID is now hidden in the game output tab when launching the game, now says Session ID is <censored>
1.6.59 February 25th, 2016
  • Unknown
1.6.57 February 24th, 2016
  • Unknown
1.6.51 February 4th, 2016
  • Unknown
1.6.48 October 9th, 2015
  • Unknown
1.6.44 September 11th, 2015
  • Added information about new OSX Installer. (Showing only on OSX)
1.6.39 September 8th, 2015
  • Fixed Launcher window closing.
  • Fixed closing the "Profile Editor" window.
  • Minor changes.
1.6.19 July 24, 2015
  • Added Windows 10 support
  • Added new argument -winTen
1.6.13 July 1, 2015
  • Launcher now creating folder "server-resource-packs" in game directory.
1.6.11 January 30, 2015
  • Installer uses Java 8[11]
  • Executable downloads its own runtime; Java no longer needs to be installed
Bug fixes:
  • MCL-546 – Unknown publisher, missing digital signature
  • MCL-2987 – Launcher will not remember login info by your gamertag
  • MCL-3128 – Launcher stuck on launcher.pack.lzma download
  • MCL-3303 – Launcher doesn't open.
1.6.5 December 18, 2014
  • Test launcher
    • Launcher Log takes note of 'proxy', for instance showing 'proxy == DIRECT'
  • Fixed: MCL-3287 – "unknown error" when running Minecraft.msi
1.6.3 December 17, 2014
  • Test launcher[12]
    • Launcher for Windows now available as .msi, installs to the /Program Files (x86)/Minecraft directory
  • First installable launcher.
1.5.5 December 16, 2014
  • Test launcher
    • Unknown
1.5.4 December 12, 2014
  • Test launcher[13]
    • Update for the native bootstrap
    • Uses a local, launcher-managed Java runtime instead of system Java.
1.5.3 September 1, 2014
Bug fixes:
  • MCL-2300 – Extra Fonts installed in Windows 8.1 stops Launcher running
  • MCL-3013 – Launcher: "Playing offline"
  • MCL-3171 – Checksum mismatch for realms 1.5.8
  • MCL-3257 – < Forgotten in the Client
1.5.2 August 19, 2014
  • Re-launching Minecraft with a user used previously will override the game output tab for that user
1.5.1 July 29, 2014
  • Fix launcher stuck on Loading...[14]
  • Fixed: MCL-2494 – Play and Log out buttons grayed out on first run of launcher / launcher update
1.5 July 28, 2014
  • Development Console tab renamed to Launcher Log
  • You can now run multiple instances of Minecraft at once, provided they're on different users
  • Play button renamed to Already Playing... if Minecraft is open while looking at launcher
  • New tab called Game Output (yourusername) appears after launching minecraft
1.4.7 July 25, 2014
  • Prepend libraries instead of appending(?)
1.4.6 July 25, 2014
  • Added some command-line switches on the Profile Editor(?)
  • Added version inheritance[15]
1.4.5 July 25, 2014
  • Added a "Switch users" button to make switching users easier
  • Another attempt to fix MCL-2494, but the fix didn't work.
1.4.4 May 19, 2014
  • Attempt to fix MCL-2494, but the fix didn't work.
  • Fixed: MCL-2564 – No alpha or Beta versions in launcher (even local ones)
1.4.2 May 2, 2014
  • Loading bar displays file currently being downloaded
  • Fixed: MCL-2350 – Slowly eats large amounts of heap
  • Removed tab Local Version Editor (NYI)
  • Auto cleanup unused libraries
1.3.11 March 12, 2014
  • Update Notes website frame uses JavaFX if available
  • Profiles are now displayed in alphabetical order
1.3.10 February 13, 2014
  • Libraries use SHA-1 for validation
1.3.9 January 24, 2014
  • Updated bug tracker links
1.3.8 January 8, 2014
  • Added "(Why can I only play demo?)" link for demo accounts, under the "play demo" button. The link redirects you here
1.3.7 December 12, 2013
  • Unknown
1.3.6 December 5, 2013
  • Fixed: MCL-1895 – Cannot play offline in 1.3.5 version - immediately gamecrash when launching
1.3.5 December 4, 2013
  • Rearranged the assets folder for the new Assets Management System.[16]
1.3.4 November 26, 2013
  • Faster downloading of some big files.[17]
1.3.3 November 20, 2013
  • (Possible) Bridging of Mojang and Twitch accounts.[18]
1.3.2 November 18, 2013
  • Added time it took to finish jobs.
  • Faster resource downloading.[19]
1.3.1 October 29, 2013
  • Speed improvements
  • Basic read-only popup on version list tab
  • Misc fixes and cleanups
1.2.8 October 25, 2013[20]
  • Unknown
1.2.7[21] October 18, 2013
  • Added an open game directory button in the profile editor.
1.2.5[22] September 23, 2013
  • No longer displays the developer console automatically after clicking "Play". (MCL-1266)
1.2.4[23] September 19, 2013
  • Unknown
1.2.3[24] September 12, 2013
  • You can now log out from everywhere with the launcher (MCL-1270)
1.2.2[25] September 3, 2013
  • Fixed a bug (MCL-1461) that made the launcher take a long time to load up.
1.2.1 (Files uploaded)[26] August 6, 2013
1.2.1 (Files uploaded)[27][28] August 6, 2013
1.2.1 August 2, 2013
  • Added a warning about using Beta, Alpha, and snapshot versions
1.2 August 1, 2013
  • Added a "Time Machine" feature to use Beta versions.
    • An option for Alpha has been included but the versions are not available yet.
  • Also allows players to play versions 1.2.5-1.4.7
1.1.4 July 31, 2013
  • Some small text updates
1.1.3[29] July 27, 2013
  • Fixed low FPS issues on Intel HDXXXX chipsets.
1.1.2 July 22, 2013
  • Fixed MCL-1241 - Cannot play offline in 1.1.1
1.1.1 July 19, 2013
  • New-look launcher and login screen
  • Launcher now closes automatically when game window opens
1.0.10 July 12, 2013
  • Further support for Hopper
  • Client crashes can be flagged as Public
    • Nothing is currently done with these
  • Profiles have the option to disable Hopper support
  • Reporting directly to the bug tracker is only allowed if Hopper is turned off or the launcher can't connect to Hopper
    • Hopper will not send crash report to bug tracker if the game is modded
1.0.9 July 10, 2013
  • Added support for the new crash-reporting system, Hopper[30]
    • Any client crash will automatically submit the crash report
1.0.8 OS X (Re-upload)[31] July 9, 2013
  • Fixes to the launcher having trouble playing 1.6.2 on OS X 10.5.8 (Leopard)
1.0.8 OS X (Re-upload)[32] July 8, 2013
  • Fixes to the launcher having trouble playing 1.6.2 on OS X 10.5.8 (Leopard)
1.0.8 July 2, 2013
  • The launcher now has a high-definition icon[citation needed]
  • Mac OS X 10.5.8 users have had Minecraft 1.6.1 disabled pending a LWJGL fix, however 1.5.2 is not affected[33]
1.0.7 July 2, 2013
  • Added ability to disable automatic login[34]
1.0.6 July 1, 2013
Bug fixes:
  • MCL-92 – Starting Window Size does not fit entire GUI
  • MCL-227 – Play button not in frame @ Linux
  • MCL-262 – Text does not fit in window
  • MCL-287 – Launcher gui has limited visuals, can't select version - no access to tabs
  • MCL-596 – Incorrect version in new Mac launcher
  • MCL-696 – I don't see an option to change RAM in "Edit Profile"
1.0.5 July 1, 2013
  • Added a 'snapshot' setting in the profile editor, enabling/disabling snapshots.
  • 'Minecraft.exe'(launcher) has been digitally signed. (MCL-546)
1.0.4 June 28, 2013
  • Added a 'resolution' setting in the profile editor.
1.0.3 June 27, 2013
Bug fixes:
  • MCL-587 – Full game can be played with non-premium account
  • MCL-600 – Launcher gives wrong message when you sign in with username instead of email.
1.0.2 June 27, 2013
  • Unknown
1.0.1 June 26, 2013
  • Yggdrasil authentication re-deployed
    • Fixed: MCL-568 – Migrated Account - Can't login in 1.6 prerelease on 1.0.1 launcher
1.0.0 June 26, 2013
  • Launcher downgraded to 1.0.0
  • Disabled Yggdrasil because of login error
1.0.1 June 26, 2013
  • Enabled Yggdrasil, The new auth system
  • More secure and much more featureful.
1.0 June 25, 2013
  • Unknown
0.9.5 June 18, 2013
  • Unknown
0.9.4 June 18, 2013
  • Added "New Profile" and "Edit Profile" Buttons to the profile selection panel
0.9.3 June 14, 2013
  • Unknown
0.9.2 June 13, 2013
  • Unknown
0.9.1 June 10, 2013
  • Fixed: MCL-412 – OS X: Exception in thread "main" java.lang.NoClassDefFoundError: net/minecraft/client/main/Main
0.9 June 10, 2013
  • Now includes a Profile Editor tab.
    • Choosing the game's version can only be done by double clicking your profile and changing the version in the drop down list.
  • Changes to the Version Selector area.
0.8.3 June 7, 2013
  • Unknown
0.8.2 May 27, 2013
  • Unknown
0.8.1 May 21, 2013
  • Client window now uses Crafting Table icon for main window when a snapshot build is selected; Launcher window still uses Grass Block icon
    • Selecting release builds on Windows currently uses the basic Java icon
0.8 May 20, 2013
  • Unknown
0.7.2 May 15, 2013
  • Unknown
0.7 May 13, 2013
  • Launcher downgraded to 0.7
0.7.1 May 4, 2013
  • Unknown
0.7 May 2, 2013
  • Unknown
0.6 April 25, 2013
  • Unknown
0.5 April 23, 2013
  • Added 1.5.1 to the list of available versions in the launcher
0.4 April 23, 2013
  • Re-enabled crash reporting
0.3 April 22, 2013
  • Added Local Version Editor (NYI) tab to the launcher
  • Added window to check server status
  • Small bug fixes
0.2 April 19, 2013
  • Added Development Console tab to the launcher
  • Fixed starting game trouble
0.1 April 18, 2013
  • .minecraft directory structure is changed:
    • "assets" folder; stores resources such as language packs and sounds.
      • All music discs now use .ogg format instead of .mus format.
    • "library" folder; stores Java libraries such as LWJGL and jinput.jar.
    • "versions" folder; there are file "versions.json" (meta data) and folders that stores minecraft.jar for each versions (but its name is same as its version. e.g. for 13w16a, "versions/13w16a/13w16a.jar").
  • The launcher is an executable.

Gallery[επεξεργασία | επεξεργασία κώδικα]

Trivia[επεξεργασία | επεξεργασία κώδικα]

  • Before beta testing on the new launcher, it was supposed to select launcher language in left front, after that it was replaced by creeper face button that does nothing, just glows.
  • If you stay long enough on the "Play" button, some mobs will appear on the corner.

References[επεξεργασία | επεξεργασία κώδικα]

  1. https://twitter.com/Dinnerbone/status/344164561701724160
  2. https://twitter.com/Dinnerbone/status/364762596387205120
  3. https://help.mojang.com/customer/portal/articles/1475923-changing-game-versions
  4. http://mcupdate.tumblr.com/post/3427294253/welcome-to-the-new-minecraft-launcher
  5. http://notch.tumblr.com/post/3428176687/server-downtime-and-a-new-launcher
  6. https://twitter.com/notch/status/38621269331025921
  7. http://www.mojang.com/2012/03/minecraft-1-2-is-out/
  8. https://twitter.com/Dinnerbone/status/803235460386537472
  9. https://www.reddit.com/r/Minecraft/comments/5apvpl/help_us_test_the_new_minecraft_launcher_todays/?st=iv1jq8z1&sh=7908cfe7
  10. https://www.reddit.com/r/Minecraft/comments/59b7m0/help_us_test_the_new_minecraft_launcher_check_the/
  11. https://twitter.com/Dinnerbone/status/561096640086700032
  12. https://www.reddit.com/r/Minecraft/comments/2pkxpx/we_need_your_help_testing_the_new_minecraft
  13. https://www.reddit.com/r/Minecraft/comments/2p31cu/we_need_your_help_testing_a_new_launcher
  14. https://twitter.com/Dinnerbone/status/494220782244208640
  15. https://twitter.com/Dinnerbone/status/492715318645882880
  16. https://twitter.com/Dinnerbone/status/408246271921901568
  17. https://twitter.com/Dinnerbone/status/405366855785021440
  18. https://twitter.com/Dinnerbone/status/403111179859812352
  19. https://twitter.com/Dinnerbone/status/402434001451098112
  20. https://bugs.mojang.com/browse/MCL/fixforversion/13900
  21. https://bugs.mojang.com/browse/MCL-1664?jql=project%20%3D%20MCL%20AND%20fixVersion%20%3D%20%221.2.7%22%20ORDER%20BY%20updated%20DESC%2C%20priority%20DESC%2C%20created%20ASC
  22. https://bugs.mojang.com/browse/MCL-1266?jql=project%20%3D%20MCL%20AND%20fixVersion%20%3D%20%221.2.5%22%20ORDER%20BY%20updated%20DESC%2C%20priority%20DESC%2C%20created%20ASC
  23. https://bugs.mojang.com/issues/?jql=project%20%3D%20MCL%20AND%20fixVersion%20%3D%20%221.2.4%22%20ORDER%20BY%20updated%20DESC%2C%20priority%20DESC%2C%20created%20ASC
  24. https://twitter.com/Marc_IRL/status/378280823180361729
  25. https://twitter.com/Dinnerbone/status/374887108932288512
  26. https://twitter.com/Dinnerbone/status/365040968644296705
  27. https://twitter.com/Dinnerbone/status/364699262233223169
  28. https://twitter.com/_grum/status/364699271708151808
  29. https://twitter.com/_grum/status/361126093777936384
  30. http://hopper.minecraft.net/
  31. https://twitter.com/Dinnerbone/status/354595929925496832
  32. https://twitter.com/Dinnerbone/status/354351963288248321
  33. https://twitter.com/Dinnerbone/status/352109843731070976
  34. MCL-590

See also[επεξεργασία | επεξεργασία κώδικα]