GCP HTTP Example fails to deploy - ClassNotFound exception - JarLauncher

[rajakumare1]

Need to reopen "#1085"

Describe the bug
Building and deploying the Main branch version of spring-cloud-function-samples/function-sample-gcp-http fails with 'java.lang.ClassNotFoundException: org.springframework.boot.loader.JarLauncher'

The 4.0.x branch still packages and deploys as expected.

Steps
Clone project && cd project
./mvnw install
cd spring-cloud-function-samples/function-sample-gcp-http
mvn package
gcloud functions deploy function-sample-gcp-http
--entry-point org.springframework.cloud.function.adapter.gcp.GcfJarLauncher
--runtime java17
--trigger-http
--source target/deploy
--memory 512MB

deploy fails with above exception.

What works
cd projectRoot
git checkout 4.0.x
mvn clean
cd spring-cloud-function-samples/function-sample-gcp-http
mvn package
gcloud functions deploy function-sample-gcp-http
--entry-point org.springframework.cloud.function.adapter.gcp.GcfJarLauncher
--runtime java17
--trigger-http
--source target/deploy
--memory 512MB

Further Info
I tried JDK20, 21 and 17. All Temurin.

[rajakumare1]

Someone please look into it as the support for Spring 3.1 is over and the bug is happening is 3.3.4 Spring boot.

[rajakumare1]

Opened wrongly