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With the next upgrade in Minecraft and Minecraft mods progressing into 1.7.2, more and more mods are dropping support for Java 6. Before upgrading Java make sure your computer supports it by checking here: http://java.com/en/download/help/sysreq.xml Unlike Windows and Mac, major Linux distributions such as Ubuntu, Fedora or Red Hat Enterprise Linux offer OpenJDK as their default Java SE implementation. 32-bit vs 64-bit and what does it mean? Long story short, you cannot run a computer with more memory than 4GB if you use 32-bit. Technic recommends using 64-bit versions of Java (if supported). This allows more memory for Minecraft to use. Questions or how to check your system can be found here: Windows users: http://windows.microsoft.com/en-us/windows/32-bit-and-64-bit-windows Mac users: http://support.apple.com/kb/ht3696 Linux users: http://stackoverflow.com/a/246014 If you are needing to upgrade your Java install, grab a copy from here http://java.com/en/download/manual.jsp and follow these guides: Windows Users: Check what version of Java your running by going here: http://java.com/en/download/uninstallapplet.jsp Or checking your installed programs by going to: Control Panel -> Programs and Features and following this guide: http://java.com/en/download/help/windows_offline_download.xml Mac Users: You have special requirements for installing/uninstalling Java on your computers Please read CLOSELY here: http://java.com/en/download/faq/java_mac.xml If you cannot uninstall Java 6, install Java 7 and then follow thses steps: Next start the Java Preferences app from /Applications/Utilities Drag Java 7 to the top of the list like in the screenshot. This will make locally run Java applications use Java 7 instead of Java 6. You can uncheck the Java 6 options if you do not want them to be allowed to run. This section is for the Java runtime for local applications, and has nothing to do with the web plugin. Linux Users: Ubuntu and Fedora users: http://openjdk.java.net/install/ Red Hat, SUSE, Oracle, Oracle Enterprise, SLES users: http://java.com/en/download/help/linux_install.xml After you have installed Java 7, check to make sure it is installed here: http://java.com/en/download/installed.jsp Hope this helps clear things up! EDIT: Add Mac instructions.