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Old 02-27-2004, 10:00 PM   #1
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Registered: Feb 2004
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Java help

what do i need to do to write Java code in Linux? Like in Windows, i downloaded java (which one do i download again?) and then i have to add something to the environment variable? Can anyone tell me what to download and what, if anything, i have to add to a linux version of an environment variable? I have the java plug-in for mozilla, will i need another version of java?

Old 02-27-2004, 10:37 PM   #2
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You will need j2sdk, getg it from or from, decomress the archive, for instance in /usr/local, it will create /usr/local/j2sdk-version directory, make a symlink to this directory, ln -sf /usr/local/j2sdk-version /usr/local/java and adjust your PATH variable
export PATH=$PATH:/usr/local/java/bin, to make the PATH constant add the export statement in /etc/profile (you can add /usr/local/java to teh PATH env variable there before the export PATH OTHER_ENV_VARIABLES statement) or your local .bash_profile file.
Old 02-28-2004, 01:53 PM   #3
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wow did I put myself into a jam :-/ where does j2sdk install itself? I uninstalled j2re by accident, i guess it wasnt really an accident, but i cant find where the j2sdk installed anyways... So by doing this, i took the java plugin out of the mozilla browser. So here come my questions... how can i find how many versions of java i have installed on my system right now? and second, how to get rid of the ones and which ones dont i need? Next, where does the j2sdk install and i can use that as the mozilla plugin, right? and then i need to add that to environment variable so i can use it...

Old 02-28-2004, 02:35 PM   #4
Registered: Feb 2004
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What distribution are you using? Did you attempt to install java with your distros package management tool ? For a standard java install do the following. This is how I do it by no means is it the best or only way.

As root or use sudo

mkdir /usr/java
chown -R username:group /usr/java

Become regular user again.

download the j2sdk from sun.
Just get the sdk not the netbeans one.
Under the heading
Download J2SE v 1.4.2_03
32-bit/64-bit for Windows/Linux/Solaris SPARC32-bit for Solaris x86

Once you accept the license you will be taken to the actual download page where you should select self-extracting file (j2sdk-1_4_2_03-linux-i586.bin, 34.16 MB)
not the rpm version. once that file is downloaded
chmod 755 j2sdk-1_4_2_03-linux-i586.bin
cp j2sdk-1_4_2_03-linux-i586.bin /usr/java/
cd /usr/java./j2sdk-1_4_2_03-linux-i586.bin
ln -s /usr/java/j2sdk1.4.2_03 j2sdk
edit your .bash_profile or .profile or .bashrc or .tcshrc or whatever your shells evn script is and add or edit the following

This is all from memory so dont try and cut and paste all these command but it should be close.
export JAVA_HOME=/usr/java/j2sdkexport
export CLASSPATH="."

as for the plug in make a simlik (it must be a simlink) form

ln -s $JAVA_HOME/jre/plugin/i386/ns610-gcc32/ ~/.mozilla/plugins/


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