Hibernate父子关系类父类列出子集时出错,帮忙看下！

补充一下异常：
org.hibernate.exception.GenericJDBCException: could not initialize a collection: [org.bean.ProductTypeInfo.productInfos#1]
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:82)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:70)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.loader.Loader.loadCollection(Loader.java:1441)
at org.hibernate.loader.collection.OneToManyLoader.initialize(OneToManyLoader.java:111)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:488)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1430)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:176)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:48)
at org.hibernate.collection.PersistentSet.size(PersistentSet.java:110)
at org.test.Test.findbyPTI_PTid(Test.java:155)
at org.test.Test.cs(Test.java:199)
at org.test.Test.main(Test.java:205)
Caused by: java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]ResultSet can not re-read row data for column 1.
at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.base.BaseResultSet.validateColumnIndex(Unknown Source)
at com.microsoft.jdbc.base.BaseResultSet.getInt(Unknown Source)
at com.microsoft.jdbc.base.BaseResultSet.getInt(Unknown Source)
at org.hibernate.type.IntegerType.get(IntegerType.java:26)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:77)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:68)
at org.hibernate.persister.collection.AbstractCollectionPersister.readKey(AbstractCollectionPersister.java:633)
at org.hibernate.loader.Loader.readCollectionElement(Loader.java:648)
at org.hibernate.loader.Loader.readCollectionElements(Loader.java:370)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:314)
at org.hibernate.loader.Loader.doQuery(Loader.java:412)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:218)
at org.hibernate.loader.Loader.loadCollection(Loader.java:1434)