Ensure that 'Java version' is the latest, if used to run the Web App

Description:

Periodically, newer versions are released for Java software either due to security flaws or to include additional functionality. Using the latest Java version for web apps is recommended in order to take advantage of security fixes, if any, and/or new functionalities of the newer version.

Rationale:

Newer versions may contain security enhancements and additional functionality. Using the latest software version is recommended in order to take advantage of enhancements and new capabilities. With each software installation, organizations need to determine if a given update meets their requirements and also verify the compatibility and support provided for any additional software against the update revision that is selected.

From Azure Console

1. Login to Azure Portal using https://portal.azure.com
2. Go to 'App Services'
3. Click on each App
4. Under 'Settings' section, click on 'Configuration'
5. Click on the 'General settings' pane and ensure that for a 'Stack' of 'Java', with 'Major Version' of 'Java 11', and regardless of the 'Java web server' being used, that the 'Java web server version' is set to the 'auto-update' option (This will ensure that the web server is always up-to-date)

NOTE: No action is required If 'Java version' is set to 'Off' as Java is not used by your web app.

Using Azure Command Line Interface

To see the list of supported runtimes:

az webapp list-runtimes | grep java

To set latest Java version for an existing app, run the following command:

az webapp config set --resource-group --name --java-version --java-container --java-container-version
.