kundera: java.lang.ClassCastException: java.lang.String 无法转换为 [B

Question

我想使用 kundera 框架将一个对象插入到 cassandra 中，但我收到此错误：

java.lang.RuntimeException: java.lang.ClassCastException: java.lang.String cannot be cast to [B
        at org.apache.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:448) ~[storm-core-1.0.0.jar:1.0.0]
        at org.apache.storm.utils.DisruptorQueue.consumeBatchWhenAvailable(DisruptorQueue.java:414) ~[storm-core-1.0.0.jar:1.0.0]
        at org.apache.storm.disruptor$consume_batch_when_available.invoke(disruptor.clj:73) ~[storm-core-1.0.0.jar:1.0.0]
        at org.apache.storm.daemon.executor$fn__8226$fn__8239$fn__8292.invoke(executor.clj:851) ~[storm-core-1.0.0.jar:1.0.0]
        at org.apache.storm.util$async_loop$fn__554.invoke(util.clj:484) [storm-core-1.0.0.jar:1.0.0]
        at clojure.lang.AFn.run(AFn.java:22) [clojure-1.7.0.jar:?]
        at java.lang.Thread.run(Thread.java:745) [?:1.7.0_99]
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to [B
        at org.apache.storm.tuple.TupleImpl.getBinaryByField(TupleImpl.java:185) ~[storm-core-1.0.0.jar:1.0.0]
        at connector.bolt.PrinterBolt.execute(PrinterBolt.java:59) ~[Zorro-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
        at org.apache.storm.daemon.executor$fn__8226$tuple_action_fn__8228.invoke(executor.clj:731) ~[storm-core-1.0.0.jar:1.0.0]
        at org.apache.storm.daemon.executor$mk_task_receiver$fn__8147.invoke(executor.clj:463) ~[storm-core-1.0.0.jar:1.0.0]
        at org.apache.storm.disruptor$clojure_handler$reify__7663.onEvent(disruptor.clj:40) ~[storm-core-1.0.0.jar:1.0.0]
        at org.apache.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:435) ~[storm-core-1.0.0.jar:1.0.0]
        ... 6 more

我的实体类

@Entity
@Table(name = "pieces", schema = "piece@cassandra_pu")
public class PieceEntitie implements Serializable{

    @Id private String IdPiece;
    @Column private double width;
    @Column private double height;
    @Column private double depth;
    public PieceEntitie() {
        // TODO Auto-generated constructor stub
    }
.
.
.
}

我按照教程进行操作：https://github.com/impetus-opensource/Kundera/wiki/Getting-Started-in-5-minutes

您对这个问题的根源有什么想法吗？我们如何解决它？ 谢谢

Answer 1

使用 Storm 方法 TupleImpl.getBinaryByField() 时出现问题，它会抛出异常，即无法从 String 获取 byte[]。 Storm 元组内部有一些字符串值，而您正在尝试获取字节数组。