@Override
        public String toString() {
            return ReflectionToStringBuilder.toString(this, ToStringStyle.MULTI_LINE_STYLE);
        }
Create a key based on destination and source class types
@param destClass destination class being mapped
@param srcClass source class being mapped
@param mapId map id being used by mapping
@return created key
core/src/main/java/com/github/dozermapper/core/cache/CacheKeyFactory.java