public DockerSlaveTemplate(@Nonnull String id) throws FormException {
  if (id == null) {
    throw new FormException("Hidden id must not be null","id");
  }
  this.id=id;
}

public DockerSlaveTemplate ( @ Nonnull String id ) throws FormException { if ( id == null ) { throw new FormException ( "Hidden id must not be null" , "id" ) ; } this . id = id ; }
custom specified id . when editing existed ui entry , ui sends it back .
