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On a freshly installed box, Java was not installed, so I installed openjdk-6 via apt-get install openjdk-6-jre openjdk-6-jdk. When I try to start my Hadoop service, it complains that JAVA_HOME is not set.

Is there something that needs to be done to get JAVA_HOME set for all users?

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Installing the packages typically sets up symlinks to the common Java binaries as /usr/bin/java, etc. and that's sufficient for most Java applications.

Some still want the legacy JAVA_HOME and for something like Hadoop, the best place to set it is in the global environment config file /etc/environment ; it will then be available in the console (TTY), terminals and the desktop.

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