Examples of javax.persistence.Column.unique()

          if (Map.class.isAssignableFrom(field.getType())) {
                    columnMapper = new MapColumnMapper(field);
                } else if (Set.class.isAssignableFrom(field.getType())) {
                    columnMapper = new SetColumnMapper(field);
                } else if(compositeAnnotation == null) {
                    if (columnAnnotation.unique()) {
                        Preconditions.checkArgument(tempUniqueMapper == null, "can't have multiple unique columns '" + field.getName() + "'");
                        tempUniqueMapper = new LeafColumnMapper(field);
                    }
                    else {
                        columnMapper = new LeafColumnMapper(field);

                                    colmd.setLength(col.length());
                                    colmd.setScale(col.scale());
                                    colmd.setAllowsNull(col.nullable());
                                    colmd.setInsertable(col.insertable());
                                    colmd.setUpdateable(col.updatable());
                                    colmd.setUnique(col.unique());
                                    fmd.addColumn(colmd);
                                    overriddenFields.add(fmd);
                                }
                            }
                        }

                            colmd.setLength(col.length());
                            colmd.setScale(col.scale());
                            colmd.setAllowsNull(col.nullable());
                            colmd.setInsertable(col.insertable());
                            colmd.setUpdateable(col.updatable());
                            colmd.setUnique(col.unique());
                            fmd.addColumn(colmd);
                            overriddenFields.add(fmd);
                        }
                        else if (annName.equals(JPAAnnotationUtils.ASSOCIATION_OVERRIDES))
                        {

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