Launch Minecraft from command line - username and password as prefix

Question

I m trying to make a simple custom Minecraft launcher thing    According to the Minecraft Wiki page for the Launcher  it should be possible to run the Minecraft launcher using username and password prefixes from the command line and go directly to the game instead of through the launcher   I ve tried various versions of java -cp -u username -p password minecraft jar net minecraft LauncherFrame  and what it says is the old method    java -cp minecraft jar net minecraft LauncherFrame  lt username gt   lt password gt    The old method opens the minecraft launcher  just as if I double clicked the jar file  however it does not go directly to the menu screen   The new way  using password and username as prefix   gives me an error message saying the prefix -u username or -p password don t exist   Any help on this  I m really stuck

User · Answer

This answer is going to briefly explain how the native files are handled on the latest launcher.

As of 4/29/2017 the Minecraft launcher for Windows extracts all native files and places them info %APPDATA%\Local\Temp{random folder}. That folder is temporary and is deleted once the javaw.exe process finishes (when Minecraft is closed). The location of that temporary folder must be provided in the launch arguments as the value of

-Djava.library.path=

Also, the latest launcher (2.0.847) does not show you the launch arguments so if you need to check them yourself you can do so under the Task Manager (simply enable the Command Line tab and expand it) or by using the WMIC utility as explained here.

Hope this helps some people who are still interested in doing this in 2017.

User · Answer

For anyone meaning to do this more reliably for different Minecraft versions  I have a Python script  adapted from parts of minecraft-launcher-lib  that does the job very nicely Besides setting some basic variables near the top after the functions  it calls a get classpath that goes through for example    minecraft versions 1 16 5 1 16 5 json  and loops over the libraries array  checking to see if each object  within the array   is supposed to be added to the classpath  cp variable   whether this library is added to the java classpath is governed by the should use library function  deterministic based on the computer s architecture and operating system  finally  some jarfiles that are platform specific have extra things prepended to them  ex  natives-linux in org lwjgl lwjgl 3 2 1 lwjgl-3 2 1-natives-linux jar   this extra prepended string is handled by get natives string and is empty if it doesn t apply to the current library tested on Linux  distribution Arch Linux    usr bin env python import json import os import platform from pathlib import Path import subprocess    quot  quot  quot Debug output  quot  quot  quot  def debug str       if os getenv  DEBUG      None          print str    quot  quot  quot   Gets the natives string toprepend to the jar if it exists  If there is nothing native specific  returns and empty string   quot  quot  quot  def get natives string lib       arch    quot  quot      if platform architecture   0      quot 64bit quot           arch    quot 64 quot      elif platform architecture   0      quot 32bit quot           arch    quot 32 quot      else          raise Exception  quot Architecture not supported quot        nativesFile  quot  quot      if not  quot natives quot  in lib          return nativesFile        i ve never seen   arch   but leave it in just in case     if  quot windows quot  in lib  quot natives quot   and platform system       Windows           nativesFile   lib  quot natives quot    quot windows quot   replace  quot   arch  quot   arch      elif  quot osx quot  in lib  quot natives quot   and platform system       Darwin           nativesFile   lib  quot natives quot    quot osx quot   replace  quot   arch  quot   arch      elif  quot linux quot  in lib  quot natives quot   and platform system       quot Linux quot           nativesFile   lib  quot natives quot    quot linux quot   replace  quot   arch  quot   arch      else          raise Exception  quot Platform not supported quot        return nativesFile    quot  quot  quot  Parses  quot rule quot  subpropery of library object  testing to see if should be included   quot  quot  quot  def should use library lib       def rule says yes rule           useLib   None          if rule  quot action quot       quot allow quot               useLib   False         elif rule  quot action quot       quot disallow quot               useLib   True          if  quot os quot  in rule              for key  value in rule  quot os quot   items                    os   platform system                   if key     quot name quot                       if value     quot windows quot  and os     Windows                           return useLib                     elif value     quot osx quot  and os     Darwin                           return useLib                     elif value     quot linux quot  and os     Linux                           return useLib                 elif key     quot arch quot                       if value     quot x86 quot  and platform architecture   0      quot 32bit quot                           return useLib          return not useLib      if not  quot rules quot  in lib          return True      shouldUseLibrary   False     for i in lib  quot rules quot            if rule says yes i               return True      return shouldUseLibrary   quot  quot  quot   Get string of all libraries to add to java classpath   quot  quot  quot  def get classpath lib  mcDir       cp           for i in lib  quot libraries quot            if not should use library i               continue          libDomain  libName  libVersion   i  quot name quot   split  quot   quot           jarPath   os path join mcDir   quot libraries quot                                    libDomain split       libName  libVersion           native   get natives string i          jarFile   libName    quot - quot    libVersion    quot  jar quot          if native     quot  quot               jarFile   libName    quot - quot    libVersion    quot - quot    native    quot  jar quot           cp append os path join jarPath  jarFile        cp append os path join mcDir   quot versions quot   lib  quot id quot    f  lib  quot id quot    jar         return os pathsep join cp   version    1 16 5  username     username   uuid     uuid   accessToken     token    mcDir   os path join os getenv  HOME      minecraft   nativesDir   os path join os getenv  HOME     versions   version   natives   clientJson   json loads      Path os path join mcDir   versions   version  f  version  json    read text    classPath   get classpath clientJson  mcDir  mainClass   clientJson  mainClass   versionType   clientJson  type   assetIndex   clientJson  assetIndex    id    debug classPath  debug mainClass  debug versionType  debug assetIndex   subprocess call         usr bin java       f -Djava library path  nativesDir         -Dminecraft launcher brand custom-launcher        -Dminecraft launcher version 2 1        -cp       classPath       net minecraft client main Main        --username       username       --version       version       --gameDir       mcDir       --assetsDir       os path join mcDir   assets         --assetIndex       assetIndex       --uuid       uuid       --accessToken       accessToken       --userType        mojang        --versionType        release

User · Answer

You can do this  you just need to circumvent the launcher  In  appdata   minecraft bin  or    minecraft bin on unixy systems   there is a minecraft jar file  This is the actual game - the launcher runs this  Invoke it like so  java -Xms512m -Xmx1g -Djava library path natives  -cp  quot minecraft jar lwjgl jar lwjgl util jar quot  net minecraft client Minecraft  lt username gt   lt sessionID gt   Set the working directory to  minecraft bin  To get the session ID  POST  request this page   https   login minecraft net user  lt username gt  amp password  lt password gt  amp version 13  You ll get a response like this  1343825972000 deprecated SirCmpwn 7ae9007b9909de05ea58e94199a33b30c310c69c dba0c48e1c584963b9e93a038a66bb98  The fourth field is the session ID  More details here  Read those details  this answer is outdated Here s an example of logging in to minecraft net in C

User · Answer

Just create this batch command file in your game directory  Bat file takes one argument  1 as the username    Also  I use a splash screen to make pretty  You will NOT be able to play online  but who cares    Adjust your memory usage to fit your machine  -Xmx  amp  -Xmns     NOTE  this is for version of minecraft as of 2016-06-27    ECHO OFF SET DIR  cd  SET JAVA HOME  DIR  runtime jre-x64 1 8 0 25 SET JAVA  JAVA HOME  bin java exe SET LOW MEM 768M SET MAX MEM 2G SET LIBRARIES versions 1 10 2 1 10 2-natives-59894925878961 SET MAIN CLASS net minecraft client main Main SET CLASSPATH libraries com mojang netty 1 6 netty-1 6 jar libraries oshi-project oshi-core 1 1 oshi-core-1 1 jar libraries net java dev jna jna 3 4 0 jna-3 4 0 jar libraries net java dev jna platform 3 4 0 platform-3 4 0 jar libraries com ibm icu icu4j-core-mojang 51 2 icu4j-core-mojang-51 2 jar libraries net sf jopt-simple jopt-simple 4 6 jopt-simple-4 6 jar libraries com paulscode codecjorbis 20101023 codecjorbis-20101023 jar libraries com paulscode codecwav 20101023 codecwav-20101023 jar libraries com paulscode libraryjavasound 20101123 libraryjavasound-20101123 jar libraries com paulscode librarylwjglopenal 20100824 librarylwjglopenal-20100824 jar libraries com paulscode soundsystem 20120107 soundsystem-20120107 jar libraries io netty netty-all 4 0 23 Final netty-all-4 0 23 Final jar libraries com google guava guava 17 0 guava-17 0 jar libraries org apache commons commons-lang3 3 3 2 commons-lang3-3 3 2 jar libraries commons-io commons-io 2 4 commons-io-2 4 jar libraries commons-codec commons-codec 1 9 commons-codec-1 9 jar libraries net java jinput jinput 2 0 5 jinput-2 0 5 jar libraries net java jutils jutils 1 0 0 jutils-1 0 0 jar libraries com google code gson gson 2 2 4 gson-2 2 4 jar libraries com mojang authlib 1 5 22 authlib-1 5 22 jar libraries com mojang realms 1 9 3 realms-1 9 3 jar libraries org apache commons commons-compress 1 8 1 commons-compress-1 8 1 jar libraries org apache httpcomponents httpclient 4 3 3 httpclient-4 3 3 jar libraries commons-logging commons-logging 1 1 3 commons-logging-1 1 3 jar libraries org apache httpcomponents httpcore 4 3 2 httpcore-4 3 2 jar libraries it unimi dsi fastutil 7 0 12 mojang fastutil-7 0 12 mojang jar libraries org apache logging log4j log4j-api 2 0-beta9 log4j-api-2 0-beta9 jar libraries org apache logging log4j log4j-core 2 0-beta9 log4j-core-2 0-beta9 jar libraries org lwjgl lwjgl lwjgl 2 9 4-nightly-20150209 lwjgl-2 9 4-nightly-20150209 jar libraries org lwjgl lwjgl lwjgl util 2 9 4-nightly-20150209 lwjgl util-2 9 4-nightly-20150209 jar versions 1 10 2 1 10 2 jar SET JAVA OPTIONS -server -splash splash png -d64 -da -dsa -Xrs -Xms LOW MEM  -Xmx MAX MEM  -XX NewSize  LOW MEM  -XX  UseConcMarkSweepGC -XX  CMSIncrementalMode -XX -UseAdaptiveSizePolicy -XX  DisableExplicitGC -Djava library path  LIBRARIES  -cp  CLASSPATH    MAIN CLASS   start  D  DIR   I  HIGH  JAVA   JAVA OPTIONS  --username  1 --version 1 10 2 --gameDir  DIR  --assetsDir assets --assetIndex 1 10 --uuid 2536abce90e8476a871679918164abc5 --accessToken 99abe417230342cb8e9e2168ab46297a --userType legacy --versionType release --nativeLauncherVersion 307

User · Answer

To run Minecraft with Forge  change C  Users nov11 AppData Roaming  minecraft to your MineCraft path     Just for people who are a bit too lazy to search on Google     Special thanks to ammarx for his TagAPI 3  Github  which was used to create this command  Arguments are separated line by line to make it easier to find useful ones   java -Xms1024M -Xmx1024M -XX HeapDumpPath MojangTricksIntelDriversForPerformance javaw exe minecraft exe heapdump -Djava library path C  Users nov11 AppData Roaming  minecraft versions 1 12 2 natives -cp C  Users nov11 AppData Roaming  minecraft libraries net minecraftforge forge 1 12 2-14 23 5 2775 forge-1 12 2-14 23 5 2775 jar C  Users nov11 AppData Roaming  minecraft libraries net minecraft launchwrapper 1 12 launchwrapper-1 12 jar C  Users nov11 AppData Roaming  minecraft libraries org ow2 asm asm-all 5 2 asm-all-5 2 jar C  Users nov11 AppData Roaming  minecraft libraries org jline jline 3 5 1 jline-3 5 1 jar C  Users nov11 AppData Roaming  minecraft libraries net java dev jna jna 4 4 0 jna-4 4 0 jar C  Users nov11 AppData Roaming  minecraft libraries com typesafe akka akka-actor 2 11 2 3 3 akka-actor 2 11-2 3 3 jar C  Users nov11 AppData Roaming  minecraft libraries com typesafe config 1 2 1 config-1 2 1 jar C  Users nov11 AppData Roaming  minecraft libraries org scala-lang scala-actors-migration 2 11 1 1 0 scala-actors-migration 2 11-1 1 0 jar C  Users nov11 AppData Roaming  minecraft libraries org scala-lang scala-compiler 2 11 1 scala-compiler-2 11 1 jar C  Users nov11 AppData Roaming  minecraft libraries org scala-lang plugins scala-continuations-library 2 11 1 0 2 scala-continuations-library 2 11-1 0 2 jar C  Users nov11 AppData Roaming  minecraft libraries org scala-lang plugins scala-continuations-plugin 2 11 1 1 0 2 scala-continuations-plugin 2 11 1-1 0 2 jar C  Users nov11 AppData Roaming  minecraft libraries org scala-lang scala-library 2 11 1 scala-library-2 11 1 jar C  Users nov11 AppData Roaming  minecraft libraries org scala-lang scala-parser-combinators 2 11 1 0 1 scala-parser-combinators 2 11-1 0 1 jar C  Users nov11 AppData Roaming  minecraft libraries org scala-lang scala-reflect 2 11 1 scala-reflect-2 11 1 jar C  Users nov11 AppData Roaming  minecraft libraries org scala-lang scala-swing 2 11 1 0 1 scala-swing 2 11-1 0 1 jar C  Users nov11 AppData Roaming  minecraft libraries org scala-lang scala-xml 2 11 1 0 2 scala-xml 2 11-1 0 2 jar C  Users nov11 AppData Roaming  minecraft libraries lzma lzma 0 0 1 lzma-0 0 1 jar C  Users nov11 AppData Roaming  minecraft libraries net sf jopt-simple jopt-simple 5 0 3 jopt-simple-5 0 3 jar C  Users nov11 AppData Roaming  minecraft libraries java3d vecmath 1 5 2 vecmath-1 5 2 jar C  Users nov11 AppData Roaming  minecraft libraries net sf trove4j trove4j 3 0 3 trove4j-3 0 3 jar C  Users nov11 AppData Roaming  minecraft libraries org apache maven maven-artifact 3 5 3 maven-artifact-3 5 3 jar C  Users nov11 AppData Roaming  minecraft libraries com mojang patchy 1 1 patchy-1 1 jar C  Users nov11 AppData Roaming  minecraft libraries oshi-project oshi-core 1 1 oshi-core-1 1 jar C  Users nov11 AppData Roaming  minecraft libraries net java dev jna jna 4 4 0 jna-4 4 0 jar C  Users nov11 AppData Roaming  minecraft libraries net java dev jna platform 3 4 0 platform-3 4 0 jar C  Users nov11 AppData Roaming  minecraft libraries com ibm icu icu4j-core-mojang 51 2 icu4j-core-mojang-51 2 jar C  Users nov11 AppData Roaming  minecraft libraries net sf jopt-simple jopt-simple 5 0 3 jopt-simple-5 0 3 jar C  Users nov11 AppData Roaming  minecraft libraries com paulscode codecjorbis 20101023 codecjorbis-20101023 jar C  Users nov11 AppData Roaming  minecraft libraries com paulscode codecwav 20101023 codecwav-20101023 jar C  Users nov11 AppData Roaming  minecraft libraries com paulscode libraryjavasound 20101123 libraryjavasound-20101123 jar C  Users nov11 AppData Roaming  minecraft libraries com paulscode librarylwjglopenal 20100824 librarylwjglopenal-20100824 jar C  Users nov11 AppData Roaming  minecraft libraries com paulscode soundsystem 20120107 soundsystem-20120107 jar C  Users nov11 AppData Roaming  minecraft libraries io netty netty-all 4 1 9 Final netty-all-4 1 9 Final jar C  Users nov11 AppData Roaming  minecraft libraries com google guava guava 21 0 guava-21 0 jar C  Users nov11 AppData Roaming  minecraft libraries org apache commons commons-lang3 3 5 commons-lang3-3 5 jar C  Users nov11 AppData Roaming  minecraft libraries commons-io commons-io 2 5 commons-io-2 5 jar C  Users nov11 AppData Roaming  minecraft libraries commons-codec commons-codec 1 10 commons-codec-1 10 jar C  Users nov11 AppData Roaming  minecraft libraries net java jinput jinput 2 0 5 jinput-2 0 5 jar C  Users nov11 AppData Roaming  minecraft libraries net java jutils jutils 1 0 0 jutils-1 0 0 jar C  Users nov11 AppData Roaming  minecraft libraries com google code gson gson 2 8 0 gson-2 8 0 jar C  Users nov11 AppData Roaming  minecraft libraries com mojang authlib 1 5 25 authlib-1 5 25 jar C  Users nov11 AppData Roaming  minecraft libraries com mojang realms 1 10 22 realms-1 10 22 jar C  Users nov11 AppData Roaming  minecraft libraries org apache commons commons-compress 1 8 1 commons-compress-1 8 1 jar C  Users nov11 AppData Roaming  minecraft libraries org apache httpcomponents httpclient 4 3 3 httpclient-4 3 3 jar C  Users nov11 AppData Roaming  minecraft libraries commons-logging commons-logging 1 1 3 commons-logging-1 1 3 jar C  Users nov11 AppData Roaming  minecraft libraries org apache httpcomponents httpcore 4 3 2 httpcore-4 3 2 jar C  Users nov11 AppData Roaming  minecraft libraries it unimi dsi fastutil 7 1 0 fastutil-7 1 0 jar C  Users nov11 AppData Roaming  minecraft libraries org apache logging log4j log4j-api 2 8 1 log4j-api-2 8 1 jar C  Users nov11 AppData Roaming  minecraft libraries org apache logging log4j log4j-core 2 8 1 log4j-core-2 8 1 jar C  Users nov11 AppData Roaming  minecraft libraries org lwjgl lwjgl lwjgl 2 9 4-nightly-20150209 lwjgl-2 9 4-nightly-20150209 jar C  Users nov11 AppData Roaming  minecraft libraries org lwjgl lwjgl lwjgl util 2 9 4-nightly-20150209 lwjgl util-2 9 4-nightly-20150209 jar C  Users nov11 AppData Roaming  minecraft libraries org lwjgl lwjgl lwjgl-platform 2 9 4-nightly-20150209 lwjgl-platform-2 9 4-nightly-20150209 jar C  Users nov11 AppData Roaming  minecraft libraries org lwjgl lwjgl lwjgl 2 9 2-nightly-20140822 lwjgl-2 9 2-nightly-20140822 jar C  Users nov11 AppData Roaming  minecraft libraries org lwjgl lwjgl lwjgl util 2 9 2-nightly-20140822 lwjgl util-2 9 2-nightly-20140822 jar C  Users nov11 AppData Roaming  minecraft libraries com mojang text2speech 1 10 3 text2speech-1 10 3 jar C  Users nov11 AppData Roaming  minecraft libraries com mojang text2speech 1 10 3 text2speech-1 10 3 jar C  Users nov11 AppData Roaming  minecraft libraries ca weblite java-objc-bridge 1 0 0 java-objc-bridge-1 0 0 jar C  Users nov11 AppData Roaming  minecraft libraries ca weblite java-objc-bridge 1 0 0 java-objc-bridge-1 0 0 jar C  Users nov11 AppData Roaming  minecraft versions 1 12 2 1 12 2 jar net minecraft launchwrapper Launch --width 854 --height 480 --username Ishikawa --version 1 12 2-forge1 12 2-14 23 5 2775 --gameDir C  Users nov11 AppData Roaming  minecraft --assetsDir C  Users nov11 AppData Roaming  minecraft assets --assetIndex 1 12 --uuid N A --accessToken aeef7bc935f9420eb6314dea7ad7e1e5 --userType mojang --tweakClass net minecraftforge fml common launcher FMLTweaker --versionType Forge   Just when other solutions don t work  accessToken and  uuid can be acquired from Mojang Servers  check other anwsers for details   Edit  26 11 2018   I ve also created Launcher Framework in C    NET Framework 3 5   which you can also check to see how launcher should work Available Here

User · Answer

Those are all ways to start the standard minecraft launcher with those credentials in the text boxes    There used to be a way to login to minecraft without the launcher using the command line  but it has since been patched   If you want to make a custom launcher using the command line then good luck  the only way to login to the minecraft jar IE  the way the launcher does it  is to send a post request to https   login minecraft net  with the username password launcher version   and a RSA key  It then parses the pseudo Json  and uses the session token from that to authenticate the jar from the command line with a load of arguments    If you are trying to make a minecraft launcher and you have no knowledge of java http requests or json then you have no chance   Swift

[java] Launch Minecraft from command line - username and password as prefix

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