Overview

Step-by-step instructions for installing Oracle Java (JRE or JDK) on CentOS 6 and configuring it as the default Java runtime using the alternatives system.

Download Oracle JRE or JDK

JRE - Java Runtime Environment JDK - Java Development Kit (Includes JRE) For CentOS x86_64 download the x64 Version Oracle Java download page

Install Oracle Java CentOS RPM

For JDK: bash rpm -Uvh /path/to/binary/jdk-\*-linux-\*.rpm For JRE: ```bash rpm -Uvh /path/to/binary/jre-*-linux-*.rpm

# Configure the Default Java

## JRE and JDK

```bash
alternatives --install /usr/bin/java java /usr/java/latest/jre/bin/java 20000 alternatives --install /usr/bin/javaws javaws /usr/java/latest/jre/bin/javaws 20000

JRE Only

alternatives --install /usr/bin/javac javac /usr/java/latest/bin/javac 20000 alternatives --install /usr/bin/jar jar /usr/java/latest/bin/jar 20000

Mozilla x32 plugin

alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so libjavaplugin.so /usr/java/latest/jre/lib/i386/libnpjp2.so 20000

Mozilla x64 Plugin

alternatives --install /usr/lib64/mozilla/plugins/libjavaplugin.so libjavaplugin.so.x86\_64 /usr/java/latest/jre/lib/amd64/libnpjp2.so 20000

Select default Java

alternatives --config java

Select ‘/usr/java/latest/jre/bin/java’: ```text There are 3 programs which provide ‘java’.

Selection Command ———————————————– 1 /usr/lib/jvm/jre-1.5.0-gcj/bin/java 2 /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java *+ 3 /usr/java/latest/jre/bin/java

Enter to keep the current selection[+], or type selection number: 3

# Verify Java Version

```bash
java -version java version "1.7.0\_21" Java(TM) SE Runtime Environment (build 1.7.0\_21-b11) Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)

Enjoy.