public SampleDriver(){
  handlers=new ArrayList<SampleHandler>();
  handlers.add(new CertificateSampleHandler());
  handlers.add(new GroupSampleHandler());
  handlers.add(new SolutionUserSampleHandler());
  handlers.add(new UserSampleHandler());
}

public SampleDriver ( ) { handlers = new ArrayList < SampleHandler > ( ) ; handlers . add ( new CertificateSampleHandler ( ) ) ; handlers . add ( new GroupSampleHandler ( ) ) ; handlers . add ( new SolutionUserSampleHandler ( ) ) ; handlers . add ( new UserSampleHandler ( ) ) ; }
initialize sample driver with a list of handlers .
