Need to check but I think this maven warning is straightforward to clean up:
[WARNING] The project com.google.api-client:google-api-client-parent:pom:1.26.0-SNAPSHOT uses prerequisites which is only intended for maven-plugin projects but not for non maven-plugin projects. For such purposes you should use the maven-enforcer-plugin. See https://maven.apache.org/enforcer/enforcer-rules/requireMavenVersion.html