DataClassRowMapper doesn't pass generic field information to type conversion

[belovaf]

DataClassRowMapper doesn't pass generic field information to internal TypeConverter:

spring-framework/spring-jdbc/src/main/java/org/springframework/jdbc/core/DataClassRowMapper.java

Line 94 in b595dc1

args[i] = tc.convertIfNecessary(getColumnValue(rs, rs.findColumn(name), type), type);

As a result any field like this List<MyEnumType> values will be populated with String values (heap pollution).

This problem can be solved by replacing the code above with something like this:

args[i] = tc.convertIfNecessary(
    getColumnValue(rs, rs.findColumn(name), type),
    type,
    MethodParameter.forParameter(mappedConstructor.getParameters()[0]))

mappedConstructor.getParameters() should be extracted as a field for performance reason.