How to resolve "Couldn't find the portal-impl.jar" errors when patching 7.0 SP 12

Issue

When attempting to use the patching tool with a 7.0 Service Pack 12 bundle, the following configuration error is encountered:

Problem with the configuration: Couldn't find the portal-impl.jar. Please check the configuration or delete the existing configuration and run auto-discovery again.

Environment

DXP 7.0

Resolution

Navigate to [Liferay_Home]/patching-tool, and open the default.properties file in a text editor
Replace the default content of the file with the following:

patching.mode=binary
war.path=../tomcat-8.0.53/webapps/ROOT/
global.lib.path=../tomcat-8.0.53/lib/ext/
liferay.home=../

Additional Information

Alternately (as the error notes), you can delete the default.properties file, execute the patching-tool auto-discovery command, and create a new default.properties file containing the content printed in the console
If any of the file paths or directory names have been customized from the defaults, replace those values accordingly in the default.properties file
This issue is encountered because the properties war.path and global.lib.path reference an older version of Tomcat, as the bundle contains the updated Tomcat 8.0.53 instead of Tomcat 8.0.32
More information on patching DXP 7.0 can be found in the following articles: