Spring Boot+ Maven/Gardle/Jar to App Engine in GCP How to deploy Spring boot application in

wiht Maven : did not work successfully yet https://www.youtube.com/watch?v=0zJUK-SwPqQ

MAven https://www.youtube.com/watch?v=1TqIL7RLrx4&t=301s // it did not work with plugin command , but when i deployed same JAR it worked fine

with gralde : did not work successfully yet https://www.youtube.com/watch?v=PN4NLSpAJWc

Directly Pushing JAR File in to GCP AppEngine : gcloud app deploy gcpapp-0.0.1-SNAPSHOT.jar
https://www.youtube.com/watch?v=qx_T6-EKkBE this worked successfully

tried both videod but for both it was stuck probmting same error, at last stage error reported. Not successfull deployment at GCP