How to Download and Install Java-1.8 0 OpenJDK on Red Hat Linux
Java is one of the most popular programming languages in the world, used for developing applications for various platforms and devices. However, not all Java distributions are created equal, and choosing the right one for your needs can be challenging.
In this article, we will show you how to download and install Java-1.8 0 OpenJDK on Red Hat Linux, a free and open source implementation of the Java Platform, Standard Edition (Java SE). We will also explain the benefits of using Java-1.8 0 OpenJDK over Oracle JDK, the system requirements and prerequisites for installing it, and how to configure and use it on your Red Hat Linux system.
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Introduction
Before we dive into the installation process, let's first understand what is Java-1.8 0 OpenJDK and why use it.
What is Java-1.8 0 OpenJDK and why use it
Java-1.8 0 OpenJDK is an open source implementation of the Java SE Platform Edition version 8 (also known as JDK 8), which was released in March 2014. It contains a complete Java Runtime Environment (JRE) and a development kit (JDK) that includes a compiler, debugger, tools, libraries, and documentation.
Java-1.8 0 OpenJDK is based on the source code of Oracle JDK, which is the official reference implementation of the Java SE Platform Edition. However, unlike Oracle JDK, which requires a commercial license for production use and updates, Java-1.8 0 OpenJDK is free and open source under the GNU General Public License version 2 (GPLv2).
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Java-1.8 0 OpenJDK is supported by Red Hat Enterprise Linux (RHEL ) and other Linux distributions, and it receives regular updates and security fixes from the OpenJDK community and Red Hat. It also offers compatibility with Oracle JDK, which means that applications developed with Oracle JDK can run on Java-1.8 0 OpenJDK without any issues.
Java-1.8 0 OpenJDK is a great choice for developers and users who want to use a free and open source Java platform that is stable, secure, and reliable. It also supports the latest features and enhancements of Java SE 8, such as lambda expressions, streams, default methods, date and time API, Nashorn JavaScript engine, and more.
What are the benefits of using Java-1.8 0 OpenJDK over Oracle JDK
As we mentioned earlier, Java-1.8 0 OpenJDK is based on the source code of Oracle JDK, which means that they share the same functionality and performance. However, there are some key differences and benefits of using Java-1.8 0 OpenJDK over Oracle JDK, such as:
Licensing: Oracle JDK requires a commercial license for production use and updates, which can be costly and restrictive for some users. Java-1.8 0 OpenJDK is free and open source under the GPLv2 license, which allows anyone to use, modify, and distribute it without any fees or limitations.
Support: Oracle JDK only provides free support for six months after each major release, after which users have to pay for extended support or switch to a newer version. Java-1.8 0 OpenJDK is supported by Red Hat and the OpenJDK community for at least six years after each major release, which means that users can enjoy long-term stability and security updates without having to upgrade frequently.
Transparency: Oracle JDK is developed by Oracle behind closed doors, which means that users have limited access to the source code, bug reports, and patches. Java-1.8 0 OpenJDK is developed by the OpenJDK community in an open and collaborative manner, which means that users can access the source code, contribute to the development, report and fix bugs, and influence the direction of the project.
Of course, there are also some drawbacks of using Java-1.8 0 OpenJDK over Oracle JDK, such as:
Compatibility: Although Java-1.8 0 OpenJDK strives to be compatible with Oracle JDK, there may be some minor differences or incompatibilities in some cases, especially with proprietary or third-party libraries or tools that rely on specific features or behaviors of Oracle JDK. Users should test their applications thoroughly before switching from Oracle JDK to Java-1.8 0 OpenJDK.
Availability: Oracle JDK is available for a wider range of platforms and architectures than Java-1.8 0 OpenJDK, which may limit the options for some users who want to use Java on less common or exotic systems. Users should check the availability and compatibility of Java-1.8 0 OpenJDK for their target platforms before installing it.
Documentation: Oracle JDK provides more comprehensive and official documentation than Java-1.8 0 OpenJDK, which may make it easier for some users to learn and use Java effectively. Users should refer to the documentation of both Oracle JDK and Java-1.8 0 OpenJDK to get the most accurate and up-to-date information about Java.
What are the system requirements and prerequisites for installing Java-1.8 0 OpenJDK on Red Hat Linux
To install Java-1.8 0 OpenJDK on Red Hat Linux, you need to meet the following system requirements and prerequisites:
Operating system: You need to have a Red Hat Linux distribution that supports Java-1.8 0 OpenJDK, such as RHEL 6 or later, Fedora 19 or later, CentOS 6 or later, etc.
Disk space: You need to have at least 300 MB of free disk space for installing Java-1.8 0 OpenJDK.
Memory: You need to have at least 128 MB of RAM for running Java applications using Java-1.8 0 OpenJDK.
Internet connection: You need to have an active internet connection for downloading Java-1.8 0 OpenJDK from the official website or using the command line.
Root privileges: You need to have root privileges or sudo access for installing Java the RPM package manager or manually. We will explain both methods in detail below.
How to install Java-1.8 0 OpenJDK using the RPM package manager
To install Java-1.8 0 OpenJDK using the RPM package manager, follow these steps:
Open a terminal window and enter the following command to install the RPM file that you downloaded from the official website:sudo rpm -ivh [file]where [file] is the name of your downloaded file.
Enter your password when prompted and wait for the installation to complete.
The command will automatically install Java-1.8 0 OpenJDK and its dependencies on your system.
How to install Java-1.8 0 OpenJDK manually
To install Java-1.8 0 OpenJDK manually, follow these steps:
Open a terminal window and enter the following command to extract the RPM file that you downloaded from the official website:rpm2cpio [file] cpio -idmvwhere [file] is the name of your downloaded file.
This will create a directory named usr in your current working directory, which contains the files and folders of Java-1.8 0 OpenJDK.
Enter the following command to move the usr directory to the root directory of your system:sudo mv usr /
This will merge the usr directory with the existing /usr directory on your system, which contains the system-wide files and folders.
Enter your password when prompted and confirm the move by typing "y" when asked.
This will manually install Java-1.8 0 OpenJDK on your system.
How to set the JAVA_HOME and PATH environment variables
After installing Java-1.8 0 OpenJDK on your system, you need to set the JAVA_HOME and PATH environment variables, which tell your system where to find and execute Java commands and applications.
To set the JAVA_HOME and PATH environment variables, follow these steps:
Open a terminal window and enter the following command to find out the installation path of Java-1.8 0 OpenJDK:readlink -f /usr/bin/java
This will output something like /usr/lib/jvm/java-1.8.0-openjdk-[version]-[release].[arch]/jre/bin/java, where [version] is the update number, [release] is the build number, and [arch] is the system architecture.
The installation path of Java-1.8 0 OpenJDK is everything before /jre/bin/java, which is /usr/lib/jvm/java-1.8.0-openjdk-[version]-[release].[arch].
Enter the following command to edit the /etc/profile file, which contains the global environment variables for your system:sudo nano /etc/profile
Add the following lines at the end of the file, replacing [version], [release], and [arch] with your own values:JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-[version]-[release].[arch] export JAVA_HOME PATH=$PATH:$JAVA_HOME/bin export PATH
Save and close the file by pressing Ctrl+O and Ctrl+X.
Enter the following command to apply the changes to your current session:source /etc/profile
This will set the JAVA_HOME and PATH environment variables for your system.
How to check the installation and version of Java-1.8 0 OpenJDK
To check the installation and version of Java-1.8 0 OpenJDK on your system, follow these steps:
Open a terminal window and enter the following command to check if Java is installed and available on your system:java -version
This will output something like openjdk version "1.8.0_[version]" OpenJDK Runtime Environment (build 1.8.0_[version]-[release]-b[build]) OpenJDK 64-Bit Server VM (build 25.282-b[build], mixed mode), where [version] is the update number, [release] is the build number, and [build] is the sub-build number.
This means that Java-1.8 0 OpenJDK is installed and available on your system, and it shows the version and build information.
Configuring Java-1.8 0 OpenJDK on Red Hat Linux
After installing Java-1.8 0 OpenJDK on your system, you may want to configure some settings and options to suit your preferences and needs. In this section, we will show you how to select the default Java platform, update alternatives, configure Java security settings and certificates, and enable or disable Java plugins for browsers.
How to select the default Java platform and update alternatives
If you have more than one Java platform installed on your system, you may want to select the default one that will be used when you run Java commands or applications. You can do this by using the alternatives command, which allows you to manage symbolic links for different versions of the same program.
To select the default Java platform and update alternatives, follow these steps:
Open a terminal window and enter the following command to list all the available Java platforms on your system:sudo alternatives --config java
This will output something like There are 2 programs which provide 'java'. Selection Command ----------------------------------------------- *+ 1 /usr/lib/jvm/java-11-openjdk-[arch]/bin/java 2 /usr/lib/jvm/java-1.8.0-openjdk-[arch]/jre/bin/java Enter to keep the current selection[+], or type selection number:, where [arch] is the system architecture.
Type the selection number of the Java platform that you want to use as the default one and press Enter. For example, if you want to use Java-1.8 0 OpenJDK as the default one, type "2" and press Enter.
This will update the symbolic link for /usr/bin/java to point to the selected Java platform.
You can also use the same command to select the default Java compiler (javac) or Java web start (javaws) by replacing java with javac or javaws.
How to configure Java security settings and certificates
Java-1.8 0 OpenJDK comes with a set of security settings and certificates that control how Java applications access network resources, run unsigned or self-signed code, or interact with other applications. You can configure these settings and certificates by using the jcontrol command, which launches the Java Control Panel.
To configure Java security settings and certificates, follow these steps:
Open a terminal window and enter the following command to launch the Java Control Panel:jcontrol
This will open a graphical user interface that allows you to adjust various options for Java.
Select the "Security" tab and choose the desired security level for running Java applications. You can also manage the exception site list, which allows you to run Java applications from specific websites that are not trusted by default.
Select the "Advanced" tab and choose the desired options for advanced security settings, such as TLS protocols, encryption algorithms, certificate revocation checks, etc.
Select the "Certificates" tab and choose the desired options for managing certificates, such as importing, exporting, removing, or viewing certificates for different purposes.
Select the "General" tab and choose the desired options for general settings, such as network settings, temporary files settings, update notifications, etc.
Click on "Apply" and "OK" to save your changes and close the Java Control Panel.
How to enable or disable Java plugins for browsers
Java-1.8 0 OpenJDK comes with a plugin that allows you to run Java applets or applications within web browsers that support the Netscape Plugin Application Programming Interface (NPAPI), such as Firefox or Chrome. However, some browsers may not support or enable this plugin by default, or you may want to disable it for security or performance reasons.
To enable or disable Java plugins for browsers, follow these steps:
Open a terminal window and enter the following command to list all the available browser plugins on your system:ls /usr/lib/mozilla/plugins
This will output the names of the plugins that are installed for Mozilla-based browsers, such as Firefox or Chrome. If you see a file named libjavaplugin.so or something similar, it means that the Java plugin is installed and enabled.
To disable the Java plugin, you can either rename or delete the file, or move it to another location. For example, you can enter the following command to rename the file:sudo mv /usr/lib/mozilla/plugins/libjavaplugin.so /usr/lib/mozilla/plugins/libjavaplugin.so.disabled
To enable the Java plugin, you can either restore the original name or location of the file, or create a symbolic link to it. For example, you can enter the following command to create a symbolic link to the file:sudo ln -s /usr/lib/jvm/java-1.8.0-openjdk-[arch]/jre/lib/[arch]/libnpjp2.so /usr/lib/mozilla/plugins/where [arch] is the system architecture.
You may need to restart your browser for the changes to take effect.
Using Java-1.8 0 OpenJDK on Red Hat Linux
Now that you have installed and configured Java-1.8 0 OpenJDK on your system, you can start using it to compile and run Java applications, use the Java tools and utilities, and update or uninstall Java-1.8 0 OpenJDK if needed.
How to compile and run Java applications using Java-1.8 0 OpenJDK
To compile and run Java applications using Java-1.8 0 OpenJDK, follow these steps:
Open a terminal window and navigate to the directory where your Java source code files are located.
Enter the following command to compile your Java source code files into executable class files:javac [file].javawhere [file] is the name of your Java source code file.
This will create a class file with the same name as your source code file in the same directory.
Enter the following command to run your Java application:java [class]where [class] is the name of your main class file without the .class extension.
This will execute your Java application and display the output on the terminal window.
You can also use an integrated development environment (IDE) such as Eclipse or NetBeans to compile and run Java applications using Java-1.8 0 OpenJDK.
How to use the Java tools and utilities included in Java-1.8 0 OpenJDK
Java-1.8 0 OpenJDK comes with a set of tools and utilities that can help you with various tasks related to Java development and management, such as debugging, profiling, monitoring, testing, documentation, etc. Some of the most common and useful tools and utilities are:
javadoc: This tool generates HTML documentation from Java source code files using comments and annotations.
jdb: This tool is a command-line debugger that allows you to inspect and modify the state of a running Java application.
jconsole: This tool is a graphical console that allows you to monitor and manage the performance and resources of a running Java application.
jvisualvm: This tool is a graphical tool that allows you to profile and analyze the performance and memory usage of a running Java application.
jhat: This tool is a command-line tool that allows you to analyze heap dumps from a running or crashed Java application.
jstack: This tool is a command-line tool that allows you to print stack traces of threads from a running or crashed Java application.
jmap: This tool is a command-line tool that allows you to print memory maps of objects from a running or crashed Java application.
jstat: This tool is a command-line tool that allows you to monitor statistics of various aspects of a running Java application, such as garbage collection, class loading, compilation, etc.
jinfo: This tool is a command-line tool that allows you to print configuration information of a running Java application, such as system properties, Java options, environment variables, etc.
To use these tools and utilities, you need to open a terminal window and enter the name of the tool followed by the options and arguments that you want to use. For example, to generate HTML documentation for a Java source code file named HelloWorld.java, you can enter the following command:javadoc HelloWorld.java
You can also use the -help option to get more information about the usage and syntax of each tool. For example, to get help for the jdb tool, you can enter the following command:jdb -help
Conclusion
In this article, we have shown you how to download and install Java-1.8 0 OpenJDK on Red Hat Linux, a free and open source implementation of the Java SE Platform Edition version 8. We have also explained the benefits of using Java-1.8 0 OpenJDK over Oracle JDK, the system requirements and prerequisites for installing it, and how to configure and use it on your Red Hat Linux system.
We hope that this article has helped you to learn more about Java-1.8 0 OpenJDK and how to use it effectively on Red Hat Linux. Here are some tips and best practices for using Java-1.8 0 OpenJDK on Red Hat Linux:
Keep your Java-1.8 0 OpenJDK updated: To ensure that you have the latest features, enhancements, and security fixes for Java-1.8 0 OpenJDK, you should update it regularly using the yum update command or the graphical update manager.
Use an IDE for Java development: To make your Java development easier and more productive, you should use an IDE such as Eclipse or NetBeans, which provide features such as code completion, syntax highlighting, debugging, testing, refactoring, etc.
Follow the Java coding standards and conventions: To make your Java code more readable, maintainable, and consistent, you should follow the Java coding standards and conventions, such as naming conventions, indentation rules, commenting guidelines, etc.
Use external libraries and frameworks for Java development: To extend the functionality and capabilities of Java-1.8 0 OpenJDK, you should use external libraries and frameworks that provide solutions for common problems and tasks in Java development, such as Apache Commons, Spring Framework, Hibernate ORM, etc.
Learn more about Java-1.8 0 OpenJDK and Java SE 8: To master Java-1.8 0 OpenJDK and Java SE 8, you should learn more about their features, enhancements, APIs, tools, utilities , etc. You can find more resources and tutorials on the .
FAQs
Here are some answers to some common questions about Java-1.8 0 OpenJDK on Red Hat Linux:
Q: How do I switch between different versions of Java on Red Hat Linux?
A: You can use the alternatives command to switch between different versions of Java on Red Hat Linux, as explained in the previous section. Alternatively, you can use the update-alternatives command, which is a wrapper for the alternatives command that provides a more user-friendly interface. For example, to switch between different versions of Java, you can enter the following command:sudo update-alternatives --config java
Q: How do I uninstall Java-1.8 0 OpenJDK from Red Hat Linux?
A: To uninstall Java-1.8 0 OpenJDK from Red Hat Linux, you can use the yum remove command or the graphical package manager. For example, to uninstall Java-1.8 0 OpenJDK using the command line, you can enter the following command:sudo yum remove java-1.8.0-openjdk
Q: How do I update Java-1.8 0 OpenJDK on Red Hat Linux?
A: To update Java-1.8 0 OpenJDK on Red Hat Linux, you can use the yum update command or the graphical update manager. For example, to update Java-1.8 0 OpenJDK using the command line, you can enter the following command:sudo yum update java-1.8.0-openjdk
Q: How do I install Oracle JDK on Red Hat Linux?
A: To install Oracle JDK on Red Hat Linux, you need to download the RPM file from the , verify its integrity and authenticity, and install it using the rpm -ivh command or the graphical package manager. You also need to accept the license agreement and set the JAVA_HOME and PATH environment variables. The process is similar to installing Java-1.8 0 OpenJDK, except that you need to use a different file name and installation path.
Q: How do I compare the performance of Java-1.8 0 OpenJDK and Oracle JDK on Red Hat Linux?
A: To compare the performance of Java-1.8 0 OpenJDK and Oracle JDK on Red Hat Linux, you can use various benchmarks and tests that measure different aspects of Java performance, such as startup time, memory usage, throughput, latency, etc. Some of the popular benchmarks and tests for Java performance are , etc. 44f88ac181
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