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If your distribution has a packaged version of the Sun/Oracle JDK then you can install it. For example, on Ubuntu I can install it with
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sudo apt-get install sun-java6-jdk |
If your distribution does not have a packaged version, or you prefer to download it yourself, get a recent version of the JDK (Java 6 is required for Grouper) from http://www.oracle.com/technetwork/java/javase/downloads/index.html - make sure you download the JDK. This is available in 64 bit and 32 bit versions (choose whichever suits your operating system, Grouper runs on both), and packaged as RPM or self-extracting. For distributions which use RPMs - incuding RedHat, SUSE and Centos - you can use either the RPM or the self-extracting. If your distribution doesn't support RPM - including Debian and Ubuntu - download the self-extracting file.
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