Howto: Installing,Upgrading JAVA on Centos,Fedora,Ubuntu,RHEL5

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Download JAVA and follow the below installtion steps.

Use Java JDK absolute version (/usr/java/jdk1.7.0_03)

## java ##
alternatives --install /usr/bin/java java /usr/java/latest/bin/java 20000

## javaws ##
alternatives --install /usr/bin/javaws javaws /usr/java/latest/bin/javaws 20000

## Java Browser (Mozilla) Plugin 32-bit ##
alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so libjavaplugin.so /usr/java/latest/lib/i386/libnpjp2.so 20000

## Java Browser (Mozilla) Plugin 64-bit ##
alternatives --install /usr/lib64/mozilla/plugins/libjavaplugin.so libjavaplugin.so.x86_64 /usr/java/latest/lib/amd64/libnpjp2.so 20000


Use Java JRE latest version (/usr/java/latest)

## java ##
alternatives --install /usr/bin/java java /usr/java/latest/bin/java 20000

## javaws ##
alternatives --install /usr/bin/javaws javaws /usr/java/latest/bin/javaws 20000

## Java Browser (Mozilla) Plugin 32-bit ##
alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so libjavaplugin.so /usr/java/latest/lib/i386/libnpjp2.so 20000

## Java Browser (Mozilla) Plugin 64-bit ##
alternatives --install /usr/lib64/mozilla/plugins/libjavaplugin.so libjavaplugin.so.x86_64 /usr/java/latest/lib/amd64/libnpjp2.so 20000

 

 

Check current java, javac, javaws and libjavaplugin.so versions

 

java -version
java version "1.7.0_03"
Java(TM) SE Runtime Environment (build 1.7.0_03-b04)
Java HotSpot(TM) 64-Bit Server VM (build 22.1-b02, mixed mode)

javaws
Java(TM) Web Start 10.0.0.4-fcs
[...]

javac -version
javac 1.7.0_03


Swap between OpenJDK and Sun/Oracle Java JDK/JRE 6 and 7 versions

JAVA

alternatives --config java

There are 5 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*  1           /usr/java/jdk1.6.0_24/jre/bin/java
   2           /usr/lib/jvm/jre-1.5.0-gcj/bin/java
 + 3           /usr/java/jdk1.6.0_26/jre/bin/java
   4           /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
   5           /usr/java/jdk1.7.0_03/jre/bin/java

Enter to keep the current selection[+], or type selection number: 5

Note: java with [+] is currently on use

javaws

alternatives --config javaws

There are 3 programs which provide 'javaws'.

  Selection    Command
-----------------------------------------------
*  1           /usr/java/jdk1.6.0_24/jre/bin/javaws
 + 2           /usr/java/jdk1.6.0_26/jre/bin/javaws
   3           /usr/java/jdk1.7.0_03/jre/bin/javaws

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

Note: java with [+] is currently on use

libjavaplugin.so (32-bit)

alternatives --config libjavaplugin.so

There are 3 programs which provide 'libjavaplugin.so'.

  Selection    Command
-----------------------------------------------
*  1           /usr/java/jdk1.6.0_24/jre/lib/i386/libnpjp2.so
 + 2           /usr/java/jdk1.6.0_26/jre/lib/i386/libnpjp2.so
   3           /usr/java/jdk1.7.0_03/jre/lib/i386/libnpjp2.so

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

javac

alternatives --config javac

There are 3 programs which provide 'javac'.

  Selection    Command
-----------------------------------------------
*  1           /usr/java/jdk1.6.0_24/bin/javac
 + 2           /usr/java/jdk1.6.0_26/bin/javac
   3           /usr/java/jdk1.7.0_03/bin/javac

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

Note: java with [+] is currently on use


Post-Installation Setup

Add JAVA_HOME environment variable to /etc/profile file or $HOME/.bash_profile file

Java JDK and JRE latest version (/usr/java/latest)

## export JAVA_HOME JDK/JRE ##
export JAVA_HOME="/usr/java/latest"

Java JDK and JRE absolute version (/usr/java/jdk1.7.0_03)

## export JAVA_HOME JDK ##
export JAVA_HOME="/usr/java/jdk1.7.0_03"

## export JAVA_HOME JRE ##
export JAVA_HOME="/usr/java/jre1.7.0_03"
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