Installation java jdk linux

6 JDK Installation for Linux Platforms

This page describes JDK for Linux system requirements and gives installation instructions for several JDK-Linux combinations.

This page contains these topics:

See «JDK 8 and JRE 8 Installation Start Here» for general information about installing JDK 8 and JRE 8.

For information on enhancements to JDK 8 that relate to the installer, see «Installer Enhancements in JDK 8».

System Requirements

See http://www.oracle.com/technetwork/java/javase/certconfig-2095354.html for information about supported platforms, operating systems, and browsers.

On a 64-bit system, you can download either the 64-bit or the 32-bit version of the Java platform. However, if you are using a 32-bit browser and you want to use the plugin, then you need to install the 32-bit version of the Java platform. To determine which version of Firefox you are running, launch the application, and select the menu item Help -> About Mozilla Firefox. At the bottom of the window is a version string line that contains either «Linux i686» (32-bit) or «Linux x86_64» (64-bit). To setup the Java plugin, see «Manual Installation and Registration of Java Plugin for Linux».

JDK 8 Installation Instructions

Installation Instructions Notation and Files

For instructions containing the notation version , substitute the appropriate JDK update version number. For example, if you are installing update JDK 8 update release 2, the following string representing the name of the bundle:

jdk-8uversion-linux-i586.tar.gz

Note that, as in the preceding example, the version number is sometimes preceded with the letter u , for example, 8u2 , and sometimes it is preceded with an underbar, for example, jdk1.8.0_02 .

The following table lists the options and instructions for downloading the JDK 8 release on a Linux platform.

Download File and Instructions	Architecture (CPU Type)	Who Can Install
For Linux x64 systems: jdk-8u version -linux-x64.tar.gz «Installation of the 64-bit JDK on Linux Platforms»	Intel — 64-bit	anyone
For Linux aarch64 (64-bit ARM) systems: jdk-8u version -linux-aarch64.tar.gz (version 8u271 and later) «Installation of the 64-bit JDK on Linux Platforms	ARM — 64-bit	anyone
For Linux x86 systems: jdk-8u version -linux-i586.tar.gz «Installation of the 32-bit JDK on Linux Platforms»	Intel — 32-bit	anyone
For Linux x64 systems: jdk-8u version -linux-x64.rpm «Installation of the 64-bit JDK on RPM-based Linux Platforms»	Intel — 64-bit RPM-based Linux	root
For Linux aarch64 (64-bit ARM) systems: jdk-8u version -linux-aarch64.rpm (version 8u271 and later) «Installation of the 64-bit JDK on RPM-based Linux Platforms»	ARM — 64-bit RPM-based Linux	root
For Linux x86 systems: jdk-8u version -linux-i586.rpm «Installation of the 32-bit JDK on RPM-based Linux Platforms»	Intel — 32-bit RPM-based Linux	root

Installation can be performed using either of the following:

• Installation of JDK using archive files ( .tar.gz ) allows you to install a private version of the JDK for the current user into any location, without affecting other JDK installations. However, it may involve manual steps to get some of the features to work (for example, the -version: release option of the java command, which allows you to specify the release to be used to run the specified class, requires the correct path to the JDK release under /usr/jdk ).
• Installation of JDK using RPM packages allows you to perform a system-wide installation of the JDK for all users, and requires root access.

JDK 7u6 and later releases include JavaFX SDK (version 2.2 or later). The JavaFX SDK and Runtime are installed and integrated into the standard JDK directory structure.

Installation of the 64-bit JDK on Linux Platforms

This procedure installs the Java Development Kit (JDK) for 64-bit Linux, using an archive file ( .tar.gz ).

These instructions use the following files:

1. Download the required file. Before the file can be downloaded, you must accept the license agreement. The archive file can be installed by anyone (not only root users), in any location that you can write to. However, only the root user can install the JDK into the system location.
2. Change directory to the location where you would like the JDK to be installed, then move the .tar.gz archive file to the current directory.
3. Unpack the archive file and install the JDK.
   • For x64 — % tar zxvf jdk-8uversion-linux-x64.tar.gz
   • For 64-bit ARM system — % tar zxvf jdk-8uversion-linux-aarch64.tar.gz

The Java Development Kit files are installed in a directory called jdk1.8.0_ version in the current directory.

Installation of the 64-bit JDK on RPM-based Linux Platforms

This procedure installs the Java Development Kit (JDK) for 64-bit RPM-based Linux platforms, such as Oracle, Red Hat and SuSE, using an RPM binary file ( .rpm ) in the system location. You must be root to perform this installation.

These instructions use the following files:

1. Download the required file. Before the file can be downloaded, you must accept the license agreement.
2. Become root by running su and entering the super-user password.
3. Uninstall any earlier installations of the JDK packages.

• For x64 — # rpm -ivh jdk-8uversion-linux-x64.rpm
• For 64-bit ARM system — # rpm -ivh jdk-8uversion-linux-aarch64.rpm

• For x64 — # rpm -Uvh jdk-8uversion-linux-x64.rpm
• For 64-bit ARM system — # rpm -Uvh jdk-8uversion-linux-aarch64.rpm

Starting with version 8u40, the JDK installation is integrated with the alternatives framework and after installation, the alternatives framework is updated to reflect the binaries from the recently installed JDK. Java commands such as java , javac , javadoc , and javap can be invoked from the command line.

Using the java -version command, users can confirm the default (recently installed) JDK version.

In addition, users can now check which specific RPM package provides the java files:

Change in Communication With the Alternatives Framework of JDK RPM Installer Starting With JDK 8u261

Prior to JDK 8u261, the JDK RPM installers registered two groups of symbolic links with the alternatives framework, java and javac . In some versions of the alternatives framework, certain link names in these groups were duplicated, which resulted in installation failures.

Starting with JDK 8u261, the JDK RPM doesn’t register the javac group with the alternatives framework. All links unique to the javac group are moved into the java group, but the set of symbolic links registered by the installer are not changed; only the duplicated links have been dropped.

The implication of this change is that if you install JDK 8u261 and JDK 8u251 (or older versions) and uninstall JDK 8u261, the symbolic links from the java group that are managed by the alternatives framework will be deleted. To restore the deleted links, run the following command:

/usr/sbin/alternatives --auto java

Installation of the 32-bit JDK on Linux Platforms

This procedure installs the Java Development Kit (JDK) for 32-bit Linux, using an archive file ( .tar.gz ).

These instructions use the following file:

jdk-8uversion-linux-i586.tar.gz

1. Download the file. Before the file can be downloaded, you must accept the license agreement. The archive file can be installed by anyone (not only root users), in any location that you can write to. However, only the root user can install the JDK into the system location.
2. Change directory to the location where you would like the JDK to be installed, then move the .tar.gz archive file to the current directory.
3. Unpack the archive file and install the JDK.

% tar zxvf jdk-8uversion-linux-i586.tar.gz

Installation of the 32-bit JDK on RPM-based Linux Platforms

This procedure installs the Java Development Kit (JDK) for 32-bit RPM-based Linux platforms, such as Red Hat and SuSE, using an RPM binary file ( .rpm ) in the system location. You must be root to perform this installation.

These instructions use the following file:

jdk-8uversion-linux-i586.rpm

1. Download the file. Before the file can be downloaded, you must accept the license agreement.
2. Become root by running su and entering the super-user password.
3. Uninstall any earlier installations of the JDK packages.

# rpm -ivh jdk-8uversion-linux-i586.rpm

# rpm -Uvh jdk-8uversion-linux-i586.rpm

Starting with version 8u40, the JDK installation is integrated with the alternatives framework and after installation, the alternatives framework is updated to reflect the binaries from the recently installed JDK. Java commands such as java , javac , javadoc , and javap can be invoked from the command line.

Using the java -version command, users can confirm the default (recently installed) JDK version.

In addition, users can now check which specific RPM package provides the java files:

Installation of Public Key on RPM-based Linux Platforms

Since JDK version 8, the JDK RPMs are signed with OL keys. Installation of these RPMs on Linux distributions other than OL gives a warning message indicating that security validation of the package fails. This indicates that the public key used to sign this RPM needs to be installed in the system. A sample warning message and the public key installation steps are as follows:

Sample Warning Message

jdk-8u281-ea-bin-b03-linux-amd64-20_oct_2020.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY

Installation Steps

1. Download the key file from https://yum.oracle.com/RPM-GPG-KEY-oracle-ol7 using the following command: wget https://yum.oracle.com/RPM-GPG-KEY-oracle-ol7
2. Install the key using the following command: sudo rpm —import RPM-GPG-KEY-oracle-ol7

General Installation Notes

This topic describes general installation topics.

Root Access

Installing the software automatically creates a directory called jdk1.8.0_ version . Note that if you choose to install the JDK into system-wide location, such as /usr/jdk , you must first become root to gain the necessary permissions. If you do not have root access, simply install the JDK into your home directory, or a subdirectory that you have permission to write to.

Overwriting Files

If you install the software in a directory that contains a subdirectory named jdk1.8.0_ version , the new software overwrites files of the same name in that jdk1.8.0_ version directory. Please be careful to rename the old directory if it contains files you would like to keep.

System Preferences

By default, the installation script configures the system such that the backing store for system preferences is created inside the JDK’s installation directory. If the JDK is installed on a network-mounted drive, it and the system preferences can be exported for sharing with Java runtime environments on other machines.

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