By default, RedHat Linux AS and AS4 servers don’t come with a JDK (Java Development Kit) installed on them. Depending on your install, if you run the java command you may get some sort of error message or a file not found message.
In this post I will describe how to install a JDK on your RedHat Linux server. It should also work on Fedora, however I have not tried it personally.
- First we need to download a JDK. I am downloading JDK 6u1 from http://java.sun.com/javase/downloads/index.jsp. Go to that page and click the Download button. On the new page that loads, we will download the Linux RPM in self-extracting file.
- Once you have downloaded your file, and have it placed somewhere on your Linux box (I put mine in /root/jdk), we will extract and install it. The name of the file I downloaded was jdk-6u1-linux-i586-rpm.bin.
- Login to your Linux box as the root user, and change directory to where you placed the jdk file that you downloaded.
- Make sure the file you downloaded is executable.
chmod 755 jdk-6u1-linux-i586-rpm.bin
- Now run the file.
./jdk-6u1-linux-i586-rpm.bin
- A license agreement will appear on your screen displayed through the more command. Simply press the enter key until you get to the end, or just press the q key to skip right to the end.
- At the end of the agreement, type yes to agree to it and continue with the install.
- The JDK will now unpack and install itself. Your screen output should look similar to the following:
Unpacking... Checksumming... Extracting... UnZipSFX 5.50 of 17 February 2002, by Info-ZIP (Zip-Bugs@lists.wku.edu). inflating: jdk-6u1-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... Done. - The install routine installs the files into the directory /usr/java/jdk1.6.0_01. It also creates two links in that directory named default and latest. It’s about time Sun has done this. I have been manually doing something like this since the JDK 1.2 days. These links make it easy to migrate to a new JVM, as you would reference the link in your shell scripts and not the actual JVM directory itself.
- Now we want our system to automatically put the JDK binary files into our PATH when we login for all users. To do this, edit the /etc/profile file and place the following two lines at the bottom of your file:
JAVA_HOME=/usr/java/default; export JAVA_HOME PATH=$JAVA_HOME/bin:$PATH; export PATH
- Now if you logout of your system and then log back in, you should be able to run the java command to print its version. Run the following command:
java -version
And your output should look like:
java version "1.6.0_01" Java(TM) SE Runtime Environment (build 1.6.0_01-b06) Java HotSpot(TM) Client VM (build 1.6.0_01-b06, mixed mode, sharing)
- Congratulations, your JDK is installed!
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