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Cassandra Datastax SFM supports.

There is a newer version: 8.2.3

package org.sfm.datastax.impl.getter;

import com.datastax.driver.core.GettableByIndexData;
import com.datastax.driver.core.UserType;
import org.sfm.datastax.DatastaxColumnKey;
import org.sfm.datastax.DatastaxMapperFactory;
import org.sfm.datastax.impl.DatastaxMappingContextFactoryBuilder;
import org.sfm.datastax.impl.RowGetterFactory;
import org.sfm.map.Mapper;
import org.sfm.map.MapperConfig;
import org.sfm.map.column.FieldMapperColumnDefinition;
import org.sfm.map.mapper.FieldMapperMapperBuilder;
import org.sfm.map.mapper.MapperSourceImpl;
import org.sfm.reflect.Getter;
import org.sfm.reflect.meta.ClassMeta;

import java.lang.reflect.Type;
import java.util.Iterator;

public class DatastaxUDTGetter implements Getter {
    private final Mapper mapper;
    private final int index;

    public DatastaxUDTGetter(Mapper mapper, int index) {
        this.mapper = mapper;
        this.index = index;
    }

    @Override
    public T get(GettableByIndexData target) throws Exception {
        return mapper.map(target.getUDTValue(index));
    }

    @SuppressWarnings("unchecked")
    public static  Getter newInstance(DatastaxMapperFactory factory, Type target,  UserType tt, int index) {
        Mapper mapper = newUDTMapper(target, tt, factory);
        return new DatastaxUDTGetter
(mapper, index);
    }

    public static 
 Mapper newUDTMapper(Type target, UserType tt, DatastaxMapperFactory factory) {
        FieldMapperMapperBuilder builder = newFieldMapperBuilder(factory, target);

        Iterator iterator = tt.iterator();
        int i = 0;
        while(iterator.hasNext()) {
            UserType.Field f = iterator.next();
            FieldMapperColumnDefinition identity = FieldMapperColumnDefinition.identity();
            builder.addMapping(new DatastaxColumnKey(f.getName(), i, f.getType()), identity);
            i ++;
        }

        return builder.mapper();
    }

    public static 
 FieldMapperMapperBuilder newFieldMapperBuilder(DatastaxMapperFactory factory, Type target) {
        MapperConfig> config = factory.mapperConfig();
        MapperSourceImpl mapperSource = new MapperSourceImpl(GettableByIndexData.class, new RowGetterFactory(factory));
        ClassMeta classMeta = factory.getClassMeta(target);
        return new FieldMapperMapperBuilder(
                mapperSource,
                classMeta,
                config,
                new DatastaxMappingContextFactoryBuilder()
                );
    }
}