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Chapter 2. Installing OpenJDK


The following section describes how to install OpenJDK on Microsoft Windows and Red Hat Enterprise Linux (RHEL).

2.1. Installing OpenJDK on Windows

The following section describes how to install OpenJDK 1.8.0 on Windows using the MSI-based installer.

Procedure

  1. Download the MSI-based Installer from Red Hat Developer Portal.
  2. Run the installer and follow the on-screen installation instructions.
  3. Configure CodeReady Studio to use OpenJDK by following the instructions for Working with Java Runtime Environments.

2.1.1. Additional Resources

2.2. Installing OpenJDK on RHEL

The following section describes how to install OpenJDK 1.8.0 and OpenJDK 11 on RHEL.

Prerequisites

2.2.1. Installing OpenJDK 1.8.0 on RHEL

The following section describes how to install OpenJDK 1.8.0 on RHEL.

Procedure

  • To install OpenJDK RPMs, use:

    # yum install java-1.8.0-openjdk-devel
    Copy to Clipboard Toggle word wrap

Optionally, you can install the java-1.8.0-openjdk-src and the java-1.8.0-openjdk-demo packages. The java-1.8.0-openjdk-src package contains the complete OpenJDK 8 class library source code you can use with IDE indexers and debuggers. The java-1.8.0-openjdk-demo package contains Java runtimes for OpenJDK (demos and examples).

  • To install java-1.8.0-openjdk-demo and java-1.8.0-openjdk-src, use:

    # yum install java-1.8.0-openjdk-src java-1.8.0-openjdk-demo
    Copy to Clipboard Toggle word wrap

2.2.2. Installing OpenJDK 11 on RHEL

The following section describes how to install OpenJDK 11 on RHEL.

Procedure

  • To install OpenJDK RPMs, use:

    # yum install java-11-openjdk-devel
    Copy to Clipboard Toggle word wrap

Optionally, you can install the java-11-openjdk-src and the java-11-openjdk-demo packages. The java-11-openjdk-src package contains the complete OpenJDK 8 class library source code you can use with IDE indexers and debuggers. The java-11-openjdk-demo package contains Java runtimes for OpenJDK (demos and examples).

  • To install java-11-openjdk-demo and java-11-openjdk-src, use:

    # yum install java-11-openjdk-src java-11-openjdk-demo
    Copy to Clipboard Toggle word wrap

Troubleshooting

If you are unable to login to OpenShift 4.4.0 cluster, use JDK 8 with SSL protocol set to default or configure your Java to use TLSv1.2 as your SSL protocol.

  • To configure Java to use TLSv1.2, run:

    $ java -Djdk.tls.client.protocols=TLSv1.2 MyApplication.jar
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    Replace MyApplication with the name of the application.

2.2.3. Additional resources

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