在Java连接Cassandra的情况下， 当使用组合主键时， 默认第一个是Partition Key， 后续的均为Clustering Key.

如果有多个Clustering Key, 在Java中需指定Clustering Key的Order顺序， 否则将出现 "The clustering keys ordering is wrong for @EmbeddedId" 错误。

代码示例：

`@Entity(table = "table_name")

public class DemoDO {

@EmbeddedIdprivate CompoundKey id;public static class CompoundKey {    @PartitionKey    @Column(name = "filed_one")    public String fieldOne;    @ClusteringColumn(1)    @Column(name = "field_two")    private String fieldTwo;    @ClusteringColumn(2)    @Column(name = "field_three")    private Date fieldThree;    public CompoundKey() {    }    public CompoundKey(String fieldOne, String fieldTwo, Date fieldThree) {        this.fieldOne= fieldOne;        this.fieldTwo= fieldTwo;        this.fieldThree= fieldThree;    }   ...}@Column(name = "field_four")private String fieldFour;

...

}

`