premium: get the 1.0.0 Minecraft jar here modsforminecraft.com/ and delete the Minecraft jar that you have and put the 1.0.0 jar in
on windows on the folders thing at the to type in %appdata% then go to .minecraft than bin then delete the minecraft jar in it then put the 1.4 jar in
MinecraftServer.exe/jar
You need an a jar from alpha stages, which you can get with Minecraft Nostalgia.
download it then chuck its contents in a mods folder in minecraft .jar
You need to download the pre-release jar and replace your other jar with the pre-release jar.
You need to have java 6 or later installed on your mac for a minecraft server jar to open correctly. If this doesn't work you can use a terminal command to run the jar.
You have to open it with winrar.
Download it off the minecraft forums. Then drag everything in the file into the minecraft jar on winrar, or 7zip.
you need to download the jar on minecraft wiki or somewhere else. And then go into your home folder-library-application support-minecraft- and then go into bin and replace the jar with the one you downloaded. MERRY CHRISTMAS
go to options, and force update. this will restore your minecraft jar and make it run again.
If you search minecraft alpha jar file on google you can download the jar file and replace your current one. Also you can go to minecraft.net and play the free browser version.