Installing Java on CentOS

Verified as of CentOS 5.8, Java 6. CentOS 6 users: fucking switch to Debian +already. Is something wrong with you? Do you like being abused by your +vendors?

From Package Management (Yum)

OpenJDK is available via EPEL, from +the Fedora project. Install EPEL before proceeding.

You didn't install EPEL. Go install EPEL. The directions are in the EPEL +FAQ.

Now install the JDK:

sudo yum install java-1.6.0-openjdk-devel
+

Or just the runtime:

sudo yum install java-1.6.0-openjdk
+

The RPMs place the appropriate binaries in /usr/bin.

Applications that can't autodetect the JDK may need JAVA_HOME set to +/usr/lib/jvm/java-openjdk.

By Hand

The Java SE Development Kit +7 +tarballs can be installed by hand. Download the “Linux x64” .tar.gz version, +then unpack it in /opt:

cd /opt
+tar xzf ~/jdk-7u45-linux-x64.tar.gz
+

This will create a directory named /opt/jdk1.7.0_45 (actual version number +may vary) containing a ready-to-use Java dev kit.

You will need to add the JDK's bin directory to PATH if you want commands +like javac and java to work without fully-qualifying the directory:

cat > /etc/profile.d/oracle_jdk <<'ORACLE_JDK'
+PATH="${PATH}:/opt/jdk1.7.0_45/bin"
+export PATH
+ORACLE_JDK
+

(This will not affect non-interactive use; setting PATH for non-interactive +programs like build servers is beyond the scope of this document. Learn to use +your OS.)

Installation this way does not interact with the alternatives system (but +you can set that up by hand if you need to).

For tools that cannot autodetect the JDK via PATH, you may need to set +JAVA_HOME to /opt/jdk1.7.0_45.

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