定义缓存时如何从自定义类中获取 QueryFields？

Question

我正在尝试通过 jdbc 获取 Ignite Cache 数据。为此，我定义了新的自定义类并注释了这样的字段：public class MyClass implements Serializable {    @QuerySqlField(index = true)    public Integer id;    @QuerySqlField(index = true)    public String records_offset;    @QuerySqlField(index = true)    public Integer session_id;...}然后我开始以这种方式点燃：CacheConfiguration conf = new CacheConfiguration();conf.setBackups(1);conf.setName("test");QueryEntity queryEntity = new QueryEntity();queryEntity.setKeyType(Integer.class.getName());queryEntity.setValueType(CDR.class.getName());queryEntity.setTableName("CDR");conf.setQueryEntities(Arrays.asList(queryEntity));IgniteConfiguration iconf = new IgniteConfiguration();iconf.setCacheConfiguration(conf);iconf.setPeerClassLoadingEnabled(true);this.ignite = Ignition.start(iconf);this.cache = ignite.getOrCreateCache("test");现在，当我尝试从 JDBC 获取数据时，出现错误：Error: class org.apache.ignite.binary.BinaryObjectException: Custom objects are not supported (state=50000,code=0)我可以定义一组字段以获得从 JDBC 获取数据的机会LinkedHashMap<String, String> fields = new LinkedHashMap();fields.put("session_id", Integer.class.getName());fields.put("records_offset", String.class.getName());queryEntity.setFields(fields);但是，如果我已经在类定义中注释了字段，为什么还需要这样做呢？