I have a hibernate list mapping like below ( for class MainClass)


<list name="cs" cascade="all-delete-orphan" lazy="true" >
<key column="Id"/>
<index column="IndexCol"/>
<one-to-many class="Class1"/>
</list>

<list name="hs" cascade="all-delete-orphan" lazy="true" >
<key column="Id"/>
<index column="IndexCol"/>
<one-to-many class="Class2"/>
</list>

when I execute a piece of code

Transaction tx = session.beginTransaction();
Class2 cl2 = (Class2) cl1;//cl1 is object of Class1
MainClass mc = new MainClass();
mc.getCS().remove(cl1);
mc.getHS().add(cl2);
session.save(mc);
tx.commit();

its throwing exception :


javax.servlet.ServletException: root cause: Flush during cascade is dangerous
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.makeit_jsp._jspService(makeit_jsp.java:131)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)


pls.help me in solving this proble ASAP

Please use the website search. There are various FAQ entries about that:

http://www.hibernate.org/117.html#A25
http://www.hibernate.org/74.html#A13

"This almost always happens because you forgot to remove a deleted instance from an association with cascading save enabled. You should remove deleted objects from associations before flushing the session. Basically, the object you're trying to delete would be resaved to the database by it being in a collection hanging off another object. You need to remove it from other collections before deleting it. "


As said above , I am removing the object from the collection and then I am trying to save it but still I am getting the exception