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How do
I download and install Java for my Linux computer?
This article applies to:
Platform(s): Red Hat Linux, SUSE Linux
Browser(s): All Browsers
Java version(s): 1.5.0, 6.0
Linux system requirements
See supported System Configurations (http://java.sun.com/javase/6/webnotes/install
/system-configurations.html) for information about supported platforms, operating systems,
desktop managers, and browsers.
You will also need a Pentium 166MHz or faster processor with a minimum of 75MB free disk
space and a minimum of 32MB of RAM.
Follow these steps to download and install Java for Linux.
Download (#download)1.
Install (#install)2.
Enable and Configure (#enable)3.
Download
Go to http://java.com (/) and click on the Download (/en/download/linux_manual.jsp)
button
1.
There are two types of installation packages.
Linux self extracting binary file
This file can be used to install Java in a location chosen by the user and can be
installed by anyone (not only root users). As long as you are not root user, it cannot
displace the system version of the Java platform suppled by Linux.
Linux RPM package
Linux RPM (Redhat Package Manager) uses RPM to install Java. In order to use this
method, you need to have RPM available on your system. Otherwise use the other
option.
2.
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Download the package that best suits your needs. You can download the file to any of the
directories on your system.
Download and check the download file size to ensure that you have downloaded the
full, uncorrupted software bundle.
Before you download the file, notice its byte size provided on the download page on
the web site.
Once the download has completed, compare that file size to the size of the
downloaded file to make sure they are equal.
3.
Install
Linux self extracting binary file (#selfextracting)
Linux RPM package (#rpm)
Note:The instructions below are for installing Java 6. If you're-installing another version,
make sure you change the version number appropriately when you type the commands at
the terminal.
To install the Linux (self-extracting) file
Follow these instructions:
Change the permission of the file you downloaded to be executable. Type:
chmod a+x jre-6u-linux-i586.bin
1.
Verify that you have permission to execute the file. Type:
ls -l
2.
Change to the directory
in which you want to
install. Type:
cd
For example, to install the
software in the /usr/java/ directory, Type:
cd /usr/java/
Note about root access:To install Java in a system-wide location such as /usr/local, you
must login as the root user to gain the necessary permissions. If you do not have root
access, install the Java in your home directory or a subdirectory for which you have write
permissions.
3.
Run the self-extracting binary Type:
./jre-6u-linux-i586.bin
The license agreement is displayed. Review the agreement. Press the spacebar to display
the next page. At the end, enter yes to proceed with the installation.
4.
Java is installed into its own directory. In this example, it is installed in the /usr/java
/jre1.6.0_directory. When the installation has completed, you will see the word
Done.
5.
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Verify that the jre1.6.0_ sub-directory is listed under the current directory. Type:
ls
6.
The installation is now
complete. Skip to the
Enable and Configure
(#enable) section.
To install the Linux RPM (self-extracting) file
Follow these instructions:
Become the root user by running the su command and entering the super-user password.
At the terminal: Type:
su
Enter the root password.
1.
Change to the directory in which you want to install. Type:
cd
For example, to install the software in the /usr/java/ directory, Type:
cd /usr/java
Note about root access:To install Java in a system-wide location such as/usr/local, you
must login as the root user to gain the necessary permissions. If you do not have root
access, install Java in your home directory or a subdirectory for which you have write
permissions.
2.
Change the permission of the file you downloaded to be executable. Type:chmod a+x jre-6u-linux-i586-rpm.bin
3.
Start the installation process. Type:
./jre-6u-linux-i586-rpm.bin
The license agreement is displayed. Review the agreement. Press the spacebar to display
the next page. At the end, enter yes to proceed with the installation.
4.
The installation file creates and runs the file jre-6-linux-i586.rpm in the current
directory.
5.
Verify that the
jre1.6.0_
sub-directory is listed
under the current
directory. Type:
ls
6.
The installation is now
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complete. Go to the Enable and Configure (#enable) section.
Enable and Configure
Firefox or Mozilla
Create a symbolic link to the libjavaplugin.so file in the browser plugins directory
Go to the plugins sub-directory under the Firefox installation directory
cd /plugins
Create the symbolic linkln -s /plugin/i386/
ns7/libjavaplugin_oji.so
In the ln command line above, use ns7-gcc29 if Firefox was compiled with gcc2.9.
If you install Firefox 1.5 or later, you can enable the Java Console menu item in the Tools
menu. Change directories to the Firefox extensions directory, then unzip ffjcext.zip there.
cd /usr/lib/firefox-1.4/extensions
unzip /usr/java/jre1.6.0/lib/deploy/ffjcext.zip
Example
If Firefox is installed at this directory:
/usr/lib/firefox-1.4/
And if the Java is installed at this directory:
/usr/java/jre1.6.0
Then type in the terminal window to go to the browser plug-in directory:
cd /usr/lib/firefox-1.4/plugins
Enter the following command to create a symbolic link to the Java Plug-in for the
Mozilla browser.
ln -s /usr/java/jre1.6.0/plugin/i386/ns7/libjavaplugin_oji.so
1.
Start the Firefox browser, or restart it if it is already up.
In Firefox, type about:plugins in the Location bar to confirm that the Java Plugin is loaded.
If the version is Firefox 1.5 or later, click the Tools menu to confirm that Java Console is
there
2.
Test Installation
To test that Java is installed and working properly on your computer, run this test applet
(/en/download/help/testvm.xml) .
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