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How_To_Install_JDK.md

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How to Install Java Development Kit (JDK)

You will need the Java software development kit (SDK), if you want to do any coding of RPTools applications. You may also want to install multiple versions of Java, for compatibility testing (but note that as of the 1.4.1.9 development build, MapTool requires Java 9+). You may have multiple versions of the Java runtime environment (JRE) installed for running applications, but the JDK contains the compiler and other language tools that are needed to build the application from source code.

Note: You need to know if your computer is 64-bit or 32-bit (only 64-bit systems can use Java 9 and later):

  • For Windows:

    1. Open Windows Explorer.
    2. Right-click on Computer.
    3. Select Properties.
    4. Look in the System section against the System Type for either 32-bit or 64-bit when describing the operating system.

  • For Linux:

    1. Open a command prompt window (typically by right-clicking on the desktop and choosing Open in Terminal).
    2. Run the command uname -m.
    3. If the output says x86_64, you have a 64-bit machine; otherwise, you have a 32-bit system.

  • For macOS:

    1. Click on the Apple logo in the top-left of the menu bar.
    2. Select About This Mac.
    3. If the Version displayed is 10.10 or greater, you have a 64-bit machine; otherwise, you have a 32-bit system.

Install latest Java Standard Edition Development Kit

  1. Visit the Oracle download page
  2. Along the right side of the page are Download buttons directly below the text "JDK" for each version. Click the button for the version you want (currently, there are sections for Java 7, Java 8, and Java 9).
  3. Click the Accept License Agreement radio button.
  4. Click the link for your operating system to start the download.
    • Linux users can choose between downloading an rpm installer file (for Red Hat-based versions) or just a plain tar file (for all other Linux versions).
  5. Unpack the installer file you have just downloaded. You may need to disable antivirus software.
    • On Windows, double-click on the downloaded file to execute the installer.
    • On Linux, if you downloaded the rpm file, double-click it.
    • On Linux, if you downloaded the tar file, you will need to do a web search for instructions for your version of Linux.
    • On macOS, double-click the dmg file to open it, then double-click the package file in the window that opens. (Don't forget to right-click the disk image on your desktop and choose eject when the installer is done.)