Remove Item from List - Preventing java.util.ConcurrentModificationException

     Long gListTemporal=-1L;

      for( Iterator< GrupoInfVO > it = gList.iterator(); it.hasNext() ; )

          {

              GrupoInfVO str = it.next();

              if(str.getxIdGin().equals(gListTemporal) ){

                  it.remove();

              }

              else{

                  gListTemporal = str.getxIdGin();

           }

      }