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+# 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](http://fedoraproject.org/wiki/EPEL/FAQ), from
+the Fedora project. Install EPEL before proceeding.
+
+You didn't install EPEL. Go install EPEL. [The directions are in the EPEL
+FAQ](http://fedoraproject.org/wiki/EPEL/FAQ#Using_EPEL).
+
+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](http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html)
+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`.