boon/src/main/java/org/boon/core/reflection/Fields.java
public static String getSortableField( Object value1 ) {

        if (value1 instanceof Map) {
            return getSortableFieldFromMap( (Map<String, ?>) value1);
        } else {
            return getSortableFieldFromClass( value1.getClass() );
        }
    }
public static String getSortableField( Object value1 ) {

        if (value1 instanceof Map) {
            return getSortableFieldFromMap( (Map<String, ?>) value1);
        } else {
            return getSortableFieldFromClass( value1.getClass() );
        }
    }
Gets the first sortable fields found.

@param value1
@return sortable field