org.hibernate.exception.GenericJDBCException: could not load an entity:

org.hibernate.exception.GenericJDBCException: could not load an entity:  [mypack.Customer#3]
  at org.hibernate.exception.ErrorCodeConverter.handledNonSpecificException(ErrorCodeConverter.java:92)
  at org.hibernate.exception.ErrorCodeConverter.convert(ErrorCodeConverter.java:80)
  at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
  at org.hibernate.loader.Loader.loadEntity(Loader.java:1285)
  at org.hibernate.loader.entity.EntityLoader.load(EntityLoader.java:141)
  at org.hibernate.loader.entity.EntityLoader.load(EntityLoader.java:126)
  at org.hibernate.persister.entity.BasicEntityPersister.load(BasicEntityPersister.java:2496)
  at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:387)
  at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:368)
  at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:166)
  at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:140)
  at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:249)
  at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:123)
  at org.hibernate.impl.SessionImpl.get(SessionImpl.java:561)
  at org.hibernate.impl.SessionImpl.get(SessionImpl.java:556)
  at mypack.Test.main(Test.java:43)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:324)
  at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)
  Caused by: java.sql.SQLException: ORA-00600: 内部错误代码，参数: [ttcgcshnd-1], [0], [], [], [], [], [], []
 
  at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:169)
  at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:208)
  at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:543)
  at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1405)
  at oracle.jdbc.ttc7.TTC7Protocol.fetch(TTC7Protocol.java:889)
  at oracle.jdbc.driver.OracleStatement.doExecuteQuery(OracleStatement.java:1826)
  at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:2015)
  at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:395)
  at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:339)
  at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:118)
  at org.hibernate.loader.Loader.getResultSet(Loader.java:1197)
  at org.hibernate.loader.Loader.doQuery(Loader.java:366)
  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:206)
  at org.hibernate.loader.Loader.loadEntity(Loader.java:1271)
  ... 17 more
 
 
 
  <?xml version="1.0"?>
  <!DOCTYPE hibernate-mapping
  PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
  "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
  <hibernate-mapping>
 
  <class name="mypack.Customer" table="CUSTOMER">
 
  <id name="id" type="java.lang.Long" column="ID">
  <generator class="increment"/>