Red hat версия java

Download Red Hat build of OpenJDK

The Red Hat build of OpenJDK is a free and open source implementation of the Java Platform, Standard Edition (Java SE).

Get the Red Hat build of OpenJDK

Install Red Hat build of OpenJDK

Red Hat build of OpenJDK enables running Java applications in your environment

Download container images

Build your container now. Download secure, certified, and up-to-date container images for the Red Hat build of OpenJDK.

Migration Toolkit for Applications

Simplify the modernization of your legacy applications and reduce risks with the migration toolkit for applications, which is included with a Red Hat OpenShift subscription.

Use OpenJDK on Red Hat OpenShift

Red Hat build of OpenJDK runtimes enables you to run Java applications on OpenShift. You can choose to directly deploy your source using S2I or you can containerize your applications using our certified container images to run your apps on OpenShift

Run Java applications with OpenJDK

Run Quarkus apps with Red Hat build of OpenJDK

Once you have Red Hat build of OpenJDK installed, you can clone and run this locally or use the source to image option on OpenShift to run it on your cluster.

https://github.com/quarkusio/quarkus-super-heroes

Run Spring Boot apps with Red Hat build of OpenJDK

Once you have Red Hat build of OpenJDK installed, you can clone and run this locally or use the source to image option on OpenShift to run it on your cluster.

https://github.com/redhat-mw-demos/hello-world-spring-openjdk 

Run JBoss EAP apps with Red Hat build of OpenJDK

Once you have Red Hat build of OpenJDK installed, you can clone and run this locally or use the source to image option on OpenShift to run it on your cluster.

https://github.com/jboss-developer/jboss-eap-quickstarts/tree/7.4.x/helloworld-rs 

Deploying your Java applications

Red Hat build of OpenJDK enables you to run any Java applications in any environment. Explore the options below and choose the option that works the best for you.

Deploy your source [S2I]

Developers can simply specify the git repository of the source and OpenShift will automatically build and image deploy it.

Containerize Your App

Once you have Red Hat build of OpenJDK installed, you can clone and run this locally or use the source to image option on OpenShift to run it on your cluster

Deploy Jar file

If your applications can be packages into a jar file, the jar files can be uploaded to OpenShift for deployment

Install Red Hat build of OpenJDK runtime

Red Hat build of OpenJDK is available for RHEL, Windows, and other Linux environments too as a Java Runtime Environment(JRE) and a complete Java Development Kit (JDK)

Red Hat Enterprise Linux (RHEL)

Using Yum Installer:

$ sudo yum install java-17-openjdk $ java -version openjdk version "17.0.2" 2022-01-18 LTS OpenJDK Runtime Environment 21.9 (build 17.0.2+8-LTS) OpenJDK 64-Bit Server VM 21.9 (build 17.0.2+8-LTS, mixed mode, sharing) 

Using Tar.xz File:

$ mkdir ~/jdks $ cd ~/jdks $ tar -xf java-17-openjdk-17.0.5.0.8-2.portable.jre.el7.x86_64.tar.xz -C ~/jdks $ ln -s ~/jdks/java-17-openjdk-17.0.5.0.8-2.portable.jdk.el7.x86_64 ~/jdks/java-17 $ export JAVA_HOME=~/jdks/java-17 

Windows

Install OpenJDK on Windows:

1. Download the installer here.
2. Download the package and install it manually:
   1. Download the file here.
   2. Extract the contents of an archive to a directory of your choice.
   3. Set the path:

   C:\> setx /m PATH ​​​​​​​"%PATH%;C:\Progra~1\RedHat\java-17-openjdk-17.0.0.0.35-1\bin"

   C:\> setx /m JAVA_HOME "C:\Progra~1\RedHat\java-17-openjdk-17.0.0.0.35-1"

   macOS

   Red Hat build of OpenJDK is not available for Mac.
   However, there’s Temurin, a version of OpenJDK that Red Hat actively contributes to that’s available for Mac.

   Install the latest LTS version:

   brew install –cask temurin

   Install a specific version with Homebrew:

   brew tap homebrew/cask-version brew install --cask temurin17 brew install --cask temurin11

   Uninstall a specific version:

   brew uninstall --cask temurin

   Alternate Options:

   SDKMAN:

   Chocolatey:

   Other Linux

   Red Hat build of OpenJDK is available only on Windows and RHEL.
   However, there’s Temurin, a version of OpenJDK that Red Hat actively contribute to that’s available for Debian and RPG Linux.

   Debian/Ubuntu — Install the latest LTS version:

   apt-get install temurin-17-jdk

   CentOS/RHEL/Fedora — Install the latest LTS version:

   openSUSE/SLES — Install the latest LTS version:

   zypper install temurin-17-jdk

   Alternate Options:
   

   SDKMAN:

   Chocolatey:

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   How to run the correct Java version after an update

   

   When you try to run a Java program after updating your system’s version of Java, you are likely to receive an error message such as the following:

   mvn install The JAVA_HOME environment variable is not defined correctly This environment variable is needed to run this program NB: JAVA_HOME should point to a JDK not a JRE 

   The source of the problem is probably the setting of your JAVA_HOME environment variable. This article shows you how to fix this problem.

   The reason for the error message

   Java programs need a Java Runtime Environment (JRE) to run. When you program with Java, the JRE is part of the Java Development Kit (JDK). The meanings of these terms follow:

   • Java Runtime Environment (JRE): Java source code is compiled and converted to Java bytecode. If you want to run this bytecode on your platform, you need the JRE to load and interpret the bytecode.
   • Java Development Kit (JDK): This includes a JRE along with a collection of software development tools and libraries to create Java programs that can run on the platform using the JRE.

   The importance of JAVA_HOME

   Your shell finds the proper Java environment through an environment variable called JAVA_HOME . It could point to either a JDK or a JRE. As the error message shown earlier indicates, you should point to your JDK if you have a JDK. When non-developers run Java, they don’t need the entire JDK, so they can download a JRE and point JAVA_HOME to that. You can learn more about the Java platform components in the article, What is the Java Runtime Environment.

   When you upgrade Java, the system installs a new JDK, and you need to update JAVA_HOME to point to the new location.

   Environment variables used in the shell are generally defined in a start-up file. This file is located in your home directory and is called .bashrc if you use the Bash shell that is the default on Linux. Note the initial dot in the name .bashrc : this dot means that the file doesn’t normally turn up when you display the contents of the directory.

   The .bashrc file is a script that runs when a user logs in. The file itself contains a series of commands to configure the terminal session.

   Check your .bashrc file to see whether it defines JAVA_HOME and what value is assigned to the environment variable. For instance, you can execute this command in the terminal:

   The line defining JAVA_HOME in the output is as follows:

   export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-17.0.4.1.1–1.fc35.x86_64

   You have to make sure that JAVA_HOME is set correctly, with version details.

   Choosing a JDK

   In the terminal on a Linux system, run the following command:

   $ sudo alternatives --config java

   The output displays the versions of Java currently on the system, as shown in Figure 1. The command also issues a prompt allowing you to choose a version.

   

   The version you choose (3 in the figure) contains, within parentheses, a full pathname that you have to assign to your JAVA_HOME environment variable in your .bashrc file. After entering the number that you want to use, press the Enter key to finish the command.

   Updating .bashrc

   The next step is to check the value of JAVA_HOME (or add it, if it is not already present) in the .bashrc file. If .bashrc doesn’t match the pathname you choose, you can copy the pathname from the terminal display and paste it into .bashrc as I’ll show shortly.

   Figure 2 highlights the JDK path I selected in Figure 1.

   

   Figure 3 highlights the JDK path in the JAVA_HOME setting in my current .bashrc file.

   

   The paths are different, so I need to update the environment variable in the .bashrc file to match the path offered by the system. Specifically, I need to change the JDK version in the path from openjdk-17.0.4.1.1–1.fc35.x86_64 to openjdk-17.0.5.0.8–2.fc35.x86_64 .

   When you save your changes, .bashrc looks like Figure 4.

   

   Updating the shell

   To reflect the changes in your shell, either close and launch the terminal again or use the following command:

   In this way, you can easily update your JAVA_HOME environment variable and continue coding in Java.

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   Install and Upgrade Java Version on CentOs ,Red Hat and Fedora Linux

   When the server OS is installed on the server or system, most of the time java version is not updated or not installed on the operating system, and also sometimes we need to update or upgrade the java version on the server. Earlier in our article, we had to install any version of Java on a freshly installed server. Now we are going to upgrade or update the Java version from the old java version to the latest version. Here you can see also the multiple version of java also installed on the server. Recently Java version 16 also launched.

   Below is my java version, I ran the command to check the java version java -version, Nowhere is the output of my command.

   [[email protected]]# java --version openjdk 11 2018-09-25 OpenJDK Runtime Environment 18.9 (build 11+28) OpenJDK 64-Bit Server VM 18.9 (build 11+28, mixed mode)

   Below are the steps to installed or upgrade the java version.

   Downloading Latest Java Version Linux Binary

   Here was the java launch recently update OpenJDK 16, so we have downloaded it on the server through the below command. You can find the latest version of java on the official site page. Oracle also provides the latest OpenJDK release at jdk.java.net under the GPL License.

   Run below command to download and extract the downloaded file .

   Linux x64 Java Development Kit

   # cd /tmp # wget https://download.java.net/java/GA/jdk16.0.1/7147401fd7354114ac51ef3e1328291f/9/GPL/openjdk-16.0.1_linux-x64_bin.tar.gz # tar xzf openjdk-16.0.1_linux-x64_bin.tar.gz # mv jdk-16.0.1 /opt

   As we have earlier discussed in other articles that –no-cookies and –header options with curl or wget because oracle does not give download unless we have not accepted their license or terms .for accept header and license use the above syntax for download.

   Installation of Latest Java

   Update Java

   Now go to the java extracted folder through the below command and install or switch to java version through alternatives command. This is the best way to install or switch the java version to other. When we run the alternatives –config java , the command output will show different java programs which provide java, We need to choose or select command.Here we have selected /opt/jdk-16.0.1/bin/java .Follow below command to set up.

   # cd /opt/jdk-16.0.1 # alternatives --install /usr/bin/java java /opt/jdk-16.0.1/bin/java 2 # alternatives --config java

   

   Now set the jar and javac path .

   # alternatives --install /usr/bin/jar jar /opt/jdk-16.0.1/bin/jar 2 # alternatives --install /usr/bin/javac javac /opt/jdk-16.0.1/bin/javac 2 # alternatives --set jar /opt/jdk-16.0.1/bin/jar # alternatives --set javac /opt/jdk-16.0.1/bin/javac

   Now set the Environment Variables path of Java,Jre home variable through below commands

   # export JAVA_HOME=/opt/jdk-16.0.1/ # export JRE_HOME=/opt/jdk-16.0.1/jre

   Check updated Java Version :

   [[email protected] jdk-16.0.1]# java --version openjdk 16.0.1 2021-04-20 OpenJDK Runtime Environment (build 16.0.1+9-24) OpenJDK 64-Bit Server VM (build 16.0.1+9-24, mixed mode, sharing)

   I am a professional freelance contributor and founder of tech transit. Love to write and lover of education, culture, and community. I have been using it, setting, supporting, and maintaining it since 2009.Linux rocks!

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