I know how to set the Minecraft offline mode player name via:

Java -Xms512m -Xmx1024m -cp "%APPDATA%\.minecraft\bin\*"
      net.minecraft.client.Minecraft "MyName"

How do I pass more parameters to the Minecraft jar file? For instance, I would like to pass the directory parameter to the jar.

Also is it possible to make it so that the above line is executed through a Java applet?

Any help is much appreciated :)

  • This article may help: en.kioskea.net/faq/…. It discusses changing the directory. – Alexis King Mar 3 '12 at 2:52
  • why would you want to launch via applet? you already can do that at minecraft.net – Lysol Mar 8 '12 at 17:05
  • Shouldn't this question be on StackOverflow or something of the sort? Like maybe SuperUser? – user28379 Oct 30 '12 at 17:28

Disclaimer: I did write the tool I'm going to suggest to use. So, yes, this is shameless self-promotion. And no, this does not include any jars from Mojang, it is a stand-alone launcher-like...uuhhh...thingy...

You can do that with the EasyMineLauncher. It will allow you to set:

  • The directory of the jars
  • The minecraft.jar directly (which allows renaming of said jar)
  • The directory of lwjgl
  • The directory of the lwjgl native files
  • The directory in which the .minecraft directory is stored
  • A username
  • Some window options
  • A server and port to directly connect to

The following drawbacks are coming with that:

  • No updates
  • No authentication (not sure if you can play on Online servers which demand authentication or not)

You can check out the Readme for some further information.


I wrote a batch script that was originally for myself to put the .minecraft folder in the same directory as the launcher. I am not really sure what you are asking since your question is a bit vague. Assuming that minecraft is in C:\minecraft and that launch-minecraft.bat is in C:\minecraft, you can put this in launch-minecraft.bat to make .minecraft be in C:\minecraft:

CD /D %~dp0
<your code here>

where @ECHO OFF is to make the display cleaner, CD /D %~dp0 makes it so that it changes the working directory to where the batch script is located, and <your code here> is the code you want to use. Using this, your file structure should look like this (my ASCII art might be messed up on some systems):

|_ Minecraft
....|_ launch-minecraft.bat
....|_ .minecraft

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