question: protected JsonSerializer < Object > _findExplicitUntypedSerializer ( Class < ? > runtimeType , BeanProperty property ) { JsonSerializer < Object > ser = _knownSerializers . untypedValueSerializer ( runtimeType ) ; if ( ser != null ) { return ser ; } ser = _serializerCache . untypedValueSerializer ( runtimeType ) ; if ( ser != null ) { return ser ; } try { return _createAndCacheUntypedSerializer ( runtimeType , property ) ; } catch ( Exception e ) { return null ; } }
target:  Method that will try to find a serializer, either from cache or by constructing one; but will not return an "unknown" serializer if this can not be done but rather returns null.