[FIXED] Failure: (ID: 838926df) did not find any jar files with a Main-Class manifest entry

Issue

when running gcloud app deploy on my spring boot app, this error happens in Cloud Build.

Solution

I deleted my maven plugin by accident, so don't delete it.

      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>

Answered By - notacorn