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插入带有hibernate的对象时出现以下异常.从数据库中读取就像一个魅力.我使用MySQL 5.5作为数据库提供程序和hibernate 3.6.5.

我有以下数据库架构:

cell(id,cellid,lac,mcc,mnc,insertTime)
location(id,latitude,longitude,altitude,accuracy,heading,hdop,vdop,pdop,insertTime)
cellatlocation(servingCell,neighbourCell,location,signalStrength,insertTime)

其中单元格和位置中的id是主键和servingCell,neighbourCell和location是cellatlocation中的复合主键.

java.lang.NullPointerException
at org.hibernate.type.descriptor.java.AbstractTypeDescriptor.extractHashCode(AbstractTypeDescriptor.java:88)
at org.hibernate.type.AbstractStandardBasicType.getHashCode(AbstractStandardBasicType.java:196)
at org.hibernate.type.AbstractStandardBasicType.getHashCode(AbstractStandardBasicType.java:191)
at org.hibernate.type.EntityType.getHashCode(EntityType.java:325)
at org.hibernate.type.ComponentType.getHashCode(ComponentType.java:222)
at org.hibernate.engine.EntityKey.generateHashCode(EntityKey.java:126)
at org.hibernate.engine.EntityKey.<init>(EntityKey.java:70)
at org.hibernate.engine.StatefulPersistenceContext.getDatabaseSnapshot(StatefulPersistenceContext.java:286)
at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:211)
at org.hibernate.event.def.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:531)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:103)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:685)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:677)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:673)
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:597)
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:345)
at $Proxy17.saveOrUpdate(Unknown Source)

我要插入的类:Cell.java

@Entity
@Table(name = "cell", catalog = "crisis")
public class Cell implements Serializable {

private static final long serialVersionUID = -8532796958180260393L;
@Id
@GeneratedValue(strategy …