我觉得你可以变成

List list = xmlMapper.readValue(decodedXml, List.class)

列表中对象是LinkedHashMap

创建两个类：
第一个
对于试验：

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;

import generated.Root; // your package

public class Demo {

    public static void main(String[] args) throws JsonMappingException, JsonProcessingException {

        ObjectMapper mapper = new ObjectMapper();
        XmlMapper xmlMapper = new XmlMapper();

        String xml = "<root>\r\n"
                + "  <row>\r\n"
                + "    <foo>foo</foo>\r\n"
                + "    <bar>bar</bar>\r\n"
                + "  </row>\r\n"
                + "  <row>\r\n"
                + "    <foo>foo2</foo>\r\n"
                + "    <bar>bar2</bar>\r\n"
                + "  </row>\r\n"
                + "  <row>\r\n"
                + "    <foo>foo3</foo>\r\n"
                + "    <bar>bar3</bar>\r\n"
                + "  </row>\r\n"
                + "</root>";
        Root map = xmlMapper.readValue(xml, Root.class);

        System.out.println("value "+ mapper.writeValueAsString(map));

    }

}

结果：

value {"row":[{"foo":"foo","bar":"bar"},{"foo":"foo2","bar":"bar2"},{"foo":"foo3","bar":"bar3"}]}