Javadoc of methods:

1. NamedParameterJdbcOperations#queryForObject(String, SqlParameterSource, RowMapper<T>)
   https://github.com/spring-projects/spring-framework/blob/main/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/NamedParameterJdbcOperations.java#L270
2. NamedParameterJdbcOperations#queryForObject(String, Map<String,?>, RowMapper<T>) https://github.com/spring-projects/spring-framework/blob/main/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/NamedParameterJdbcOperations.java#L289

states that IncorrectResultSizeDataAccessException is supposed to be thrown if the query does not return exactly one row, or does not return exactly one column in that row. But actually second part, about count of columns, is incorrect. Query can return as many columns as RowMapper can handle.
Looks like copy-paste error from methods which accept Class instead of RowMapper.

Affected version - latest release 5.3.11