public EntityManager createEntityManager(String projectId, String jsonCredentialsFile) {
    return createEntityManager(projectId, jsonCredentialsFile, null);
  }
public EntityManager createEntityManager ( String projectId , String jsonCredentialsFile ) { return createEntityManager ( projectId , jsonCredentialsFile , null ) ; }
Creates and return a new {@link EntityManager} using the provided JSON formatted credentials.

@param projectId
the project ID

@param jsonCredentialsFile
the JSON formatted credentials file for the target Cloud project.
@return a new {@link EntityManager}