How to Change the Java Version for Apache Tomcat on Windows (Simple Guide)

Disclaimer: This guide was generated by an AI, reviewed by us, and is intended as a helpful resource. However, it may still contain errors.

Disclaimer: Diese Anleitung wurde von einer KI generiert, von uns geprüft und soll als Hilfestellung dienen. Dennoch können Fehler enthalten sein.

How to Change the Java Version for Apache Tomcat on Windows (Simple Guide)

If you want to change the Java version used by Apache Tomcat on Windows, follow these steps:

Step 1: Check the Current Java Version

1. Open the Command Prompt:
   • Press Windows + R, type cmd, and press Enter.
2. Type the following command and press Enter:

java -version

1. This will show the current Java version. Write it down for reference.

Step 2: Install the New Java Version

1. Download and install the new Java version (e.g., Zulu JDK) if you haven’t already.
   • Follow the steps from the this guide to install Zulu Java.

Step 3: Locate the Tomcat Installation Folder

1. Find the folder where Tomcat is installed (e.g., C:\Program Files\Apache Tomcat).

Step 4: Update the JAVA_HOME Variable

1. Open Control Panel > System > Advanced system settings.
2. Click Environment Variables.
3. Under System variables, find the JAVA_HOMEvariable.
   • If it doesn’t exist, click New and create it.
4. Set the value of JAVA_HOME to the installation folder of the new Java version (e.g., C:\Program Files\Zulu\zulu-21).
5. Click OK to save the changes.

Step 5: Update the JRE_HOME Variable (Optional)

1. In the same Environment Variables window, check if JRE_HOME exists.
2. If it does, update it to point to the new Java installation folder (e.g., C:\Program Files\Zulu\zulu-21).
3. If it doesn’t exist, you can skip this step.

Step 6: Restart Tomcat

1. Open the Command Prompt.
2. Navigate to the Tomcat bin folder:

cd C:\Program Files\Apache Tomcat\bin

1. Stop Tomcat if it’s running:

shutdown.bat

1. Start Tomcat again:

startup.bat

Step 7: Verify the Java Version in Tomcat

1. Open your browser and go to the Tomcat manager page (e.g., http://localhost:8080/manager/status).
2. Log in (if required) and check the Server Information section.
3. Look for the Java version to confirm it has been updated.

Done!