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:~$ XMODIFIERS= java -Xmx512M -cp Minecraft.jar net.minecraft.LauncherFrame

Exception in thread "main" java.lang.NoClassDefFoundError: net/minecraft/LauncherFrame

Caused by: java.lang.ClassNotFoundException: net.minecraft.LauncherFrame

        at java.net.URLClassLoader$1.run(URLClassLoader.java:217)

        at java.security.AccessController.doPrivileged(Native Method)

        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:321)

        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:266)

Could not find the main class: net.minecraft.LauncherFrame. Program will exit.