用hibernate保存某个对象时，报错java.lang.ClassCastException: java.lang.String，求解决

java.lang.ClassCastException: java.lang.String
net.sf.hibernate.type.TimestampType.equals(TimestampType.java:73)
net.sf.hibernate.type.AbstractType.isDirty(AbstractType.java:56)
net.sf.hibernate.type.TypeFactory.findDirty(TypeFactory.java:225)
net.sf.hibernate.persister.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:275)
net.sf.hibernate.impl.SessionImpl.flushEntity(SessionImpl.java:2536)
net.sf.hibernate.impl.SessionImpl.flushEntities(SessionImpl.java:2486)
net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2281)
net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2260)
net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:61)
org.springframework.orm.hibernate.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:491)
org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:495)
org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:468)
org.springframework.transaction.interceptor.TransactionAspectSupport.doCommitTransactionAfterReturning(TransactionAspectSupport.java

你看看数据库里有类型和hibernate里的类型是不是一至，如果是hibernate2还需要看看和xml中的是否一至仔细些，这是类型转换的问题

类型转化错误 你看看你有没有把integer型的误放到为string的情况

类转换异常

类型转换异常 , 你的实体属性中肯定有时间类型, 这个时间类型在转换的时候出现的错误.