Hibernate之java.lang.UnsupportedOperationException: Can't write to a readonly obj

参考资料
1 java.lang.UnsupportedOperationException: Can't write to a readonly object
http://hi.baidu.com/allen_zzw/blog/item/75e79cd7214d9b26960a1607.html
操作如下:
在对记录进行修改时,后台报错如下：

java.lang.UnsupportedOperationException: Can't write to a readonly object
	at org.hibernate.cache.ReadOnlyCache.lock(ReadOnlyCache.java:43)
	at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:84)
	at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
	at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297)
	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
	at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985)
	at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:333)
	at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)

在程序中对应的class.hbm.xml文件，有这这样一句设置:

cache usage="read-only"/>

解决方法:
1 直接将这句设置删除就行了
2 把 <cache usage="read-only"/>改为可以读写的<cache usage="read-write"/>