我们在代码中使用了dse驱动程序1.8.2，实体定义如下：

public class HistoryByEmail implements Serializable {
  ...
  @Column(name = ADDITIONAL_DATA)
  private Map<String, String> additionalData;
}

当我试图从该列中读取值时，出现以下错误：

com.datastax.driver.core.exceptions.CodecNotFoundException: Codec not found for requested operation: [varchar <-> java.util.Map<java.lang.String, java.lang.String>]

我在那一列添加了编解码器：

@Column(name = ADDITIONAL_DATA, codec = TypeCodec.MapCodec.class)
  private Map<String, String> additionalData;

但是代码不会被编译，也尝试了以下方法，没有一种有效：

@Column(name = ADDITIONAL_DATA, codec = TypeCodec.AbstractMapCodec<String, String>.class)
  private Map<String, String> additionalData;

  @Column(name = ADDITIONAL_DATA, codec = TypeCodec.AbstractMapCodec<>.class)
  private Map<String, String> additionalData;