Installing Java

From Michael's Pluskat box notes

Download the latest JDK from http://java.sun.com/javase/downloads/index.jsp and proceed with

the installation as follows

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yum -y install libstdc++-296 compat-libstdc++-33

mv jdk-6u3-linux-i586.bin /opt

cd opt; chmod +x jdk-6u3-linux-i586.bin

./jdk-6u3-linux-i586.bin # accept the license agreement

rm -f jdk-6u3-linux-i586.bin

Create and edit /etc/profile.d/java.sh and add the following

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export JAVA_HOME=/opt/jdk1.6.0_03

export PATH=$JAVA_HOME/bin:$PATH

Add the above variables to your current session

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source /etc/profile

Confirm Java is installed

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[root@localhost ~]# which java

/opt/jdk1.6.0_03/bin/java

Check if GCJ is installed (GNU compiler for Java - usually Red Hat systems install this by default)

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alternatives --config java

If it returns nothing then proceed with the next step and install it as 1 (the value shown on the end),

else if there is an entry already listed as 1 then proceed and install it as 2.

Install it systemwide

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alternatives --install /usr/bin/java java /opt/jdk1.6.0_03/bin/java 1

Confirm again

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[root@localhost ~]# alternatives --config java

There is 1 program that provides 'java'.

Selection Command

-----------------------------------------------

*+ 1 /opt/jdk1.6.0_03/bin/java

[root@localhost ~]# alternatives --display java

java - status is auto.

link currently points to /opt/jdk1.6.0_03/bin/java

/opt/jdk1.6.0_03/bin/java - priority 1

Current `best' version is /opt/jdk1.6.0_03/bin/java.

And lastly for the Java compiler (javac)

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[root@localhost ~]# which javac

/opt/jdk1.6.0_03/bin/javac