 
Subject
Grab the sdk from java.com. For us, we are going to install this on Lobstora, which is a GNU/Linux box. Just make the binary executable and run it:
[root@srv-1 opt]# chmod 700 j2*.bin
[root@srv-1 opt]# ./j2sdk-1_4_2_03-linux-i586.bin
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We like putting this in /opt with a symlink to j2sdk.
[root@srv-1 opt]# ln -s j2sdk1.4.2_03 j2sdk
[root@srv-1 opt]# ls -l
total 20
lrwxrwxrwx 1 root root 13 Jan 24 11:03 j2sdk -> j2sdk1.4.2_03
drwxr-xr-x 9 root root 4096 Jan 24 09:32 j2sdk1.4.2_03
drwx------ 2 root root 16384 Jan 19 13:29 lost+found
[root@srv-1 opt]#
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Let's set up the environment variables and the path in /etc/profile:
JAVA_HOME="/opt/j2sdk"
PATH="$PATH:/opt/j2sdk/bin"
export PATH JAVA_HOME USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC
[root@srv-1 opt]# source /etc/profile
[root@srv-1 opt]# set
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JAVA_HOME=/opt/j2sdk
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PATH=/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:
/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin:/opt/j2sdk/bin
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[root@srv-1 opt]# java -version
java version "1.4.2_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_03-b02)
Java HotSpot(TM) Client VM (build 1.4.2_03-b02, mixed mode)
[root@srv-1 opt]#
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Looking good.
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