Cassandra 1.2 requires Oracle JRE.
You must configure your operating system to use the Oracle JRE, not the OpenJDK. The
latest 64-bit version of Java 6 or 7 is recommended. The minimum supported versions
are 1.6.0_29 and 1.7.0_25.
Note: After installing the JRE, you may need to set
JAVA_HOME:
$ export JAVA_HOME=<path_to_java>
The Oracle Java Runtime Environment (JRE) has been removed from the official
software repositories of Ubuntu and only provides a binary (.bin)
version. You can get the JRE from the Java SE Downloads.
Procedure
-
Check which version of the JRE your system is using:
If Oracle Java is used, the results should look like:
java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)
-
If necessary, go to Oracle Java SE Downloads, accept the
license agreement, and download the installer for your distribution.
Note: If installing the Oracle JRE in a cloud environment, accept the license
agreement, download the installer to your local client, and then use
scp (secure copy) to transfer the file to your cloud
machines.
-
Place the downloaded file in the /usr/java/latest
directory.
-
From the /usr/java/latest directory, unpack the tarball
and install the JRE:
$ sudo tar zxvf jre-7u<version>-linux-x64.tar.gz
The JRE files are installed into a directory called
jre-7u_<version>.
-
Tell the system that there's a new Java version available:
$ sudo update-alternatives --install "/usr/bin/java" "java" "/usr/java/latest/jre1.7.0_<version>/bin/java" 1
If updating from a previous version that was removed manually, execute the
above command twice, because you'll get an error message the first time.
-
Set the new JRE as the default:
$ sudo update-alternatives --set java /usr/java/latest/jre1.7.0_<version>/bin/java
-
Make sure your system is now using the correct JRE. For example:
java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)
