Day: August 10, 2007

jsp:include page="" 和 include file="" 的区别

2007-08-10 | 阅读(845)

下面用三个实验，更清淅的理解 <jsp:include page=""/> 和 <%@ include file="" %> 的区别。
<jsp:include page=""/> 包含被 include 文件的输出
<%@ include file="" %> 包含被 include 文件的代码

a.jsp 内容：

b.jsp 内容：(空)

_a.class a.jsp编译成类的内容: 阅读全文 >>

Hibernate 保存对象出现 org.hibernate.NonUniqueObjectException 及解决

2007-08-10 | 阅读(4,393)

Hibernate save 在 session 中已存在相同 OID(主键) 的对象，会出现异常，详细内容如下：

Exception in thread "main" org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.unmi.LoanDetail#1]
 at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:168)
 at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
 at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
 at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
 at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient 阅读全文 >>