Without Java 1.7 installed, certain plugins (mine included) will not work, at all. This is due to the fact that except for Java 1.7, Java 1.6 is the most common version, and sadly the plugins are not backwards compatible. Please note that the Java Run-time Environment 7 is currently not available to Mac users. A 1.7 development kit IS available for Mac OS, but Mac OS JDK integration will not be covered by this thread. As for Linux users, I know that since you are running Linux you're more likely to help program for Java than to not know how to instal it, so I'll let you do your own thing. 1) Before we do anything, check to make sure you don't already have Java 1.7 installed. You can do this by: Start -> "cmd" -> ENTER, and type "java -version" without quotations. If the first line is 'Java version "1.7.0"' then skip to step 4, otherwise continue to step 2. 2) You can download the latest version of Java 1.7 (jre-7) here: http://www.oracle.com/technetwork/java/javase/downloads/java-se-jre-7-download-432155.html. Please make sure to bullet the "Accept License Agreement" option above the download links. If you are running a 32 bit version of windows, please select the "Windows x86 Offline" version, otherwise select "Windows x64". 3) You may chose to Run the file directly, or save it to a folder of your choice and run it from there. Either way, open the setup and follow the instructions to instal it. Do not change the directory unless you are confident about what you are doing. 4) If you already have your server files generated, skip to step 5. Otherwise, please follow this tutorial: http://wiki.bukkit.org/Setting_up_a_server 5) Navigate to the folder which contains your server files, and locate "RUN.bat" (please note, the '.bat' extension may not be visible). Right click the file and select "Edit". Delete everything in the file, and copy this over: Code: @ECHO OFF SET BINDIR=%~dp0 CD /D "%BINDIR%" "%ProgramFiles%\Java\jre7\bin\java.exe" -Xmx1024M -Xms1024M -jar craftbukkit.jar PAUSE 6) Save and close the file. And that's it! Next time you start you server, you will be running Java 1.7.