Perform the following in the Azure Console:

1. Login to Azure Portal using https://portal.azure.com
2. Go to App Services
3. Click on each App
4. Under Setting section, Click on Application settings
5. Under General settings , Set Java version to latest version available
6. Set Java minor version to latest version available
7. Set Java web container to the latest version of web container available

Perform the following in Azure Command Line Interface 2.0:

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 <RESOURCE_GROUP_NAME> –name <APP_NAME> –java-version ‘ 1.8 ‘ –java-container ‘ Tomcat ‘ –java-container-version ‘ & lt;VERSION & gt;’

References:

1. https://docs.microsoft.com/en-us/azure/app-service/web-sites-configure#general-settings