Upgrading Java on Windows

Upgrading your Java Runtime Environment (JRE) and Java Development Kit (JDK) on Windows is essential to ensure your system is equipped with the latest features and security patches. 

This step-by-step guide will walk you through the process, covering upgrading to JRE 8u391 and JDK 8u391, setting environment variables, and verifying installations.

Upgrading to Java 8u391

1. Download JDK 8u391:

    • Visit the Oracle JDK Downloads page.

    • Download the Java SE Development Kit (JDK) version 8u391 installer for Windows.

Use the provided link for downloading:

2. Stop Tomcat Server:

    • Stop the currently running Tomcat server from services.

3. Run the JDK Installer:

    • Run the downloaded JDK installer.

    • Follow the installation wizard's instructions.

    • Uninstall the previous JDK version if prompted or choose a new installation directory.

4. Uninstall the Previous JDK Version (Optional):

    • Navigate to "Control Panel" > "Programs" > "Programs and Features."

    • Find the existing JDK version in the list.

    • Right-click and select "Uninstall."

5. Complete the JDK Installation:
    • Follow the prompts in the installer to complete the installation.

Set the Environment Variables

1. JRE:

Update the system's PATH environment variable:

    • Right-click on "This PC" or "Computer."

    • Select "Properties."

    • Click on "Advanced system settings."

    • Click the "Environment Variables" button.

    • Under "System variables," find the "Path" variable and click "Edit."

    • Add the path to the bin directory of your new JRE installation.

Example: C:\Program Files\Java\jre1.8.0_391\bin.

    • Click "OK" to close each window.

2. JDK:
    • Update the PATH environment variable as mentioned in the previous response.

Verify Installations

1. Open a command prompt and type the following command:

    • java -version

    • Ensure that the output indicates the new version (JDK 8u391).

Perform the following steps for Tomcat Service

1. Uninstall Tomcat Service:

    • Before uninstallation, backup Java options and Heap Size for updating in the new Tomcat Service.

Command : tomcat9w.exe//ES//<tomcatservice_name>

    • Once the Java Upgrade is confirmed Need to uninstall the existing Tomcat Service.

      Command: service.bat uninstall <tomcatservice_name>

2. Install Tomcat Service:

Following the installation, configure the new Tomcat service by specifying the Java options (including additional values) and setting the heap size to match that of the previous Tomcat service.

Command: service.bat Install <tomcatservice_name>

3. After successfully Setup of java and Heap size of the Tomcat service, proceed to configure the Tomcat service is automatic.

4. Start Tomcat Server:
    • After the successful upgrade, start the Tomcat server from Services.

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