title: InvalidRequestException(why:Unknown identifier
body: <p>when I tried to save a table to <strong>cassandra</strong> using <strong>persist()</strong> method and <strong>kundera</strong> framework, i receive the error:</p>
  
  <pre><code>28462 [Thread-15-localhostAMQPbolt0-executor[2 2]] INFO  d.d.pieceDAOImpl - start to insert data
  28513 [Thread-15-localhostAMQPbolt0-executor[2 2]] INFO  c.i.c.c.CassandraClientBase - Returning cql query  INSERT INTO "pieces"("width","height","depth","IdPiece") VALUES(10.0,11.0,12.0,'1') .
  28543 [Thread-15-localhostAMQPbolt0-executor[2 2]] ERROR c.i.c.c.CassandraClientBase - Error while executing query  INSERT INTO "pieces"("width","height","depth","IdPiece") VALUES(10.0,11.0,12.0,'1')
  28544 [Thread-15-localhostAMQPbolt0-executor[2 2]] ERROR o.a.s.util - Async loop died!
  java.lang.RuntimeException: com.impetus.kundera.KunderaException: com.impetus.kundera.KunderaException: InvalidRequestException(why:Unknown identifier IdPiece)
          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: com.impetus.kundera.KunderaException: com.impetus.kundera.KunderaException: InvalidRequestException(why:Unknown identifier IdPiece)
          at com.impetus.kundera.persistence.EntityManagerImpl.persist(EntityManagerImpl.java:180) ~[project-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
          at database.dao.pieceDAOImpl.insert(pieceDAOImpl.java:54) ~[project-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
          at database.controller.DatabaseController.saveSensorEntitie(DatabaseController.java:47) ~[project-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
          at connector.bolt.PrinterBolt.execute(PrinterBolt.java:66) ~[project-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
  </code></pre>
  
  <p>And im sur that my idpiece is the primary key of my table.</p>
  
  <p>my table:</p>
  
  <pre><code>CREATE TABLE mykeyspace.pieces (
      idpiece text PRIMARY KEY,
      depth double,
      height double,
      width double
  ) WITH bloom_filter_fp_chance = 0.01
      AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}'
      AND comment = ''
      AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy'}
      AND compression = {'sstable_compression': 'org.apache.cassandra.io.compress.LZ4Compressor'}
      AND dclocal_read_repair_chance = 0.1
      AND default_time_to_live = 0
      AND gc_grace_seconds = 864000
      AND max_index_interval = 2048
      AND memtable_flush_period_in_ms = 0
      AND min_index_interval = 128
      AND read_repair_chance = 0.0
      AND speculative_retry = '99.0PERCENTILE';
  </code></pre>
  
  <p>my class entity</p>
  
  <pre><code>@Entity
  @Table(name = "pieces", schema = "mykeyspace@cassandra_pu")
  public class PieceEntitie implements Serializable{
  
      @Id
      private String IdPiece;
      @Column
      private double width;
      @Column
      private double height;
      @Column
      private double depth;
  </code></pre>
  
  <p>how can i resolve this problem ?
  thank you in advance</p>