Method.invoke(Method.java:324) org.apache.struts.actions. Dispatch Action.dispatch Method(Dispatch Action.java:278) org.apache.struts.actions. Dispatch Action.execute(Dispatch Action.java:218) org.apache.struts.action. Request Processor.process Action Perform(Request Processor.java:465) org.apache.struts.action. Request Processor.process(Request Processor.java:274) org.apache.struts.action. Action Servlet.process(Action Servlet.java:1422) org.apache.struts.action. Session Impl.update(Session Impl.java:1354) org.hibernate. Hibernate TemplateIn Hibernate(Hibernate Template.java:238) org.hibernate. Hibernate Template.execute(Hibernate Template.java:144) org.hibernate. Hibernate Template.update(Hibernate Template.java:236) com.b2b. Postal Address DAO.update(Postal Address DAO.java:140) com.b2b.action. Postal Address Action.update(Postal Address Action.java:272) sun.reflect. Native Method Accessor Impl.invoke0(Native Method) sun.reflect. Native Method Accessor Impl.invoke(Native Method Accessor Impl.java:39) sun.reflect. Http Servlet.service(Http Servlet.java:810) com.b2b.datas.filters. Session Filter(Session Checking.java:50) org.displaytag.filter. Response Override Filter(Response Override Filter.java:86) org.tomcat.filters. Reply Header Filter(Reply Header Filter.java:75) note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs. The problem was keeping the attribute "cascade=all" of collection, set in hbm file. When I received the request, I was loading each child from Hibernate, creating a new parent object and populating its collection with the children objects before calling a save Or Update method on the parent.,180 INFO Test Persist Save Merge:82 - Before commit ,182 DEBUG SQL:92 - update Author set first Name=? Hibernate copies the attribute values of the detached entity to the managed entity.
If the persistence context already contained a managed instance of the entity, Hibernate uses the existing one instead. When Hibernate flushes the persistence context for the next time, its dirty checking mechanism checks all managed entities.It then copies all attribute values to the managed entity and returns it to the caller. If it detects that the merge operation changed any entity attribute value, it triggers the required SQL UPDATE statement.,172 DEBUG SQL:92 - select books0_Id as book Id1_2_0_, books0_.author Id as author Id2_2_0_, book1_as id1_1_1_, book1_.fk_author as fk_autho6_1_1_, book1_.format as format2_1_1_, book1_.publishing Date as publishi3_1_1_, book1_.title as title4_1_1_, book1_.version as version5_1_1_, author2_as id1_0_2_, author2_.first Name as first Nam2_0_2_, author2_Name as last Name3_0_2_, author2_.version as version4_0_2_ from Book Author books0_ inner join Book book1_ on books0_.author Id=book1_left outer join Author author2_ on book1_.fk_author=author2_where books0_Id=? There is one important detail you need to know when you use JPA’s merge method.This might be a problem if your DBA registered an update trigger for the database table. In these situations, you can annotate your entity with ,530 INFO Test Persist Save Merge:121 - Before commit ,531 DEBUG SQL:92 - select author_.id, author_.first Name as first Nam2_0_, author_Name as last Name3_0_, author_.version as version4_0_ from Author author_ where author_.id=? programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums Hi, I am having a problem in updating the values of one form which is realated to 2 tables. Delegating Method Accessor Impl.invoke(Delegating Method Accessor Impl.java:25) reflect. Can anyone please solve my problem, and help me with the correct approach. What you are possibly doing is modifying an object so the PK matches that of one which you have already loaded into the Session. Are you recovering the object from the database and calling update in the same session, but creating a new object to do the update possibly? The problem cause, as far as I understood, is that my children objects were backreferencing the parent.When i am trying to update the values I am getting the following error message. Http Servlet.service(Http Servlet.java:810) com.b2b.datas.filters. Session Filter(Session Checking.java:50) org.displaytag.filter. Response Override Filter(Response Override Filter.java:86) org.tomcat.filters. Reply Header Filter(Reply Header Filter.java:75) root cause org.hibernate. Session Or Update(Session Impl.java:1392) hibernate.engine. Cascades.cascade(Cascades.java:114) hibernate.engine. Cascades.cascade(Cascades.java:436) hibernate.engine. Cascades.cascade(Cascades.java:503) hibernate.engine. Method.invoke(Method.java:324) org.apache.struts.actions. Dispatch Action.dispatch Method(Dispatch Action.java:278) org.apache.struts.actions. Dispatch Action.execute(Dispatch Action.java:218) org.apache.struts.action. Request Processor.process Action Perform(Request Processor.java:465) org.apache.struts.action. Request Processor.process(Request Processor.java:274) org.apache.struts.action. Action Servlet.process(Action Servlet.java:1422) org.apache.struts.action. So, when I loaded them, I loaded the parent too into my Hibernate session.In this example, the flush happens when the transaction gets committed. If you use this strategy anyways, Hibernate performs an SQL SELECT statement to retrieve the next primary key value from the database and writes the new value to the database table. ) method behave differently because there are a few differences between the JPA specification and the Javadoc of Hibernate’s proprietary methods.,994 INFO Test Persist Save Merge:237 - Save entity ,002 DEBUG SQL:92 - select nextval ('hibernate_sequence') ,042 INFO Test Persist Save Merge:240 - Commit transaction ,096 DEBUG SQL:92 - insert into Author (first Name, last Name, version, id) values (? It delays the execution of the SQL INSERT statement for the new entity until it flushes the persistence context. But almost all of these differences disappear when you take a look at the internal implementation.Hibernate’s update method doesn’t trigger an SQL SELECT statement.It just attaches the entity to the current persistence context. As you have seen, both methods have their advantages and disadvantages. When Hibernate decides to flush the persistence context, it will perform the dirty check anyway to detect all changes before it executes the required SQL UPDATE statements.