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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
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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
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2.2. Installing OpenJDK on RHEL
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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
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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
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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
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2.2.2. Installing OpenJDK 11 on RHEL
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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
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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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