Thursday, May 30, 2013

How to update JDK on Oracle Enterprise Linux from version 1.6 to 1.7

JDK is the environment to develop Java programs and updating java on Linux boxes is a requirement which often comes up. The following lists the steps required to update the JDK from version 1.6.0_22 to 1.7.0_21.


Step 1: Download the JDK rpm from the following link:

http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

Step 2: The current JDK version is:

[root@test software]# java -version
java version “1.6.0_22″
OpenJDK Runtime Environment (IcedTea6 1.10.4) (rhel-1.41.1.10.4.el6-i386)
OpenJDK Client VM (build 20.0-b11, mixed mode)

Step 3: Run the following command to update the JDK:

rpm -Uvh jdk-7u21-linux-i586.rpm
[root@test software]# rpm -Uvh jdk-7u21-linux-i586.rpm
Preparing…                ########################################### [100%]
1:jdk                    ########################################### [100%]
Unpacking JAR files…
rt.jar…
jsse.jar…
charsets.jar…
tools.jar…
localedata.jar…
plugin.jar…
javaws.jar…
deploy.jar…

Step 4: Check the version:

[root@test software]# java -version
java version “1.6.0_22″
OpenJDK Runtime Environment (IcedTea6 1.10.4) (rhel-1.41.1.10.4.el6-i386)
OpenJDK Client VM (build 20.0-b11, mixed mode)

Step 5: So the version is still pointing to the old one. We have to use the alternatives here to update the version. The newly installed Java is at this location /usr/java/jdk1.7.0_21/ :

[root@test bin]# pwd
/usr/java/jdk1.7.0_21/bin
[root@test bin]# /usr/sbin/alternatives –install /usr/bin/java java /usr/java/jdk1.7.0_21/bin/java 17021

Step 5: Now it should point to the latest version:

[root@test bin]# java -version
java version “1.7.0_21″
Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
Java HotSpot(TM) Client VM (build 23.21-b01, mixed mode, sharing)

That’s it !!!