Please do not post these kinds of questions to the development list. TIA.
Oisin Kim wrote:
Hi All, Been using Hibernate for about 2 weeks now and have run into the following problem, hopefully someone out there knows what I'm doing wrong. I've read the hibernate manual and checked the web for something similar, but can't find anything like this, I must be doing something stupid! Thanks in advance for any help with this, its wrecking my head!!!!
Bascally I create some objects persist them in a method, which is the setUp of a JUnit Test.
I run a method which makes some changes to the objects after it retrieves them from the DAO.
I use the JUnit tearDown() method to delete the objects, which then throws the Exception, the test has passed, the contents are in the DB, I've checked this by hand.
We have something like the following structure, with the domain objects:
Airline Account CardHolder
The xdoclet tags look like this:
/**
* @return
* @hibernate.set cascade="all" lazy="false"
* @hibernate.collection-key column="AIRLINE_ID"
* @hibernate.collection-one-to-many
class="com.universalred.domain.CardHolder"
* @todo should probably be a list
*/
Airline has a one to many relationship with CardHolder /**
* @return
*
* @hibernate.one-to-one class="com.universalred.domain.Account"
cascade="all"
*/
/**
* @return
* @hibernate.many-to-one class="com.universalred.domain.Airline"
column="AIRLINE_ID" not-null="false" */
CardHolder has an one to one relationship with Account and many to one
with Airline
When we do a delete on Airline it give us the following exception:
com.universalred.dao.DAOException: net.sf.hibernate.HibernateException: Flush during cascade is dangerous - this might occur if an object was deleted and then re-saved by cascade at com.universalred.dao.hibernate.BaseDAOHibernate.delete(BaseDAOHibernate. java:218) at com.universalred.dao.hibernate.AirlineDAOHibernate.delete(AirlineDAOHibe rnate.java:46) at com.universalred.io.FileEventAdaptorTest.tearDown(FileEventAdaptorTest.j ava:116) at junit.framework.TestCase.runBare(TestCase.java:130) at junit.framework.TestResult$1.protect(TestResult.java:106) at junit.framework.TestResult.runProtected(TestResult.java:124) at junit.framework.TestResult.run(TestResult.java:109) at junit.framework.TestCase.run(TestCase.java:118) at junit.framework.TestSuite.runTest(TestSuite.java:208) at junit.framework.TestSuite.run(TestSuite.java:203) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTe stRunner.java:392) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRun ner.java:276) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRu nner.java:167) Caused by: net.sf.hibernate.HibernateException: Flush during cascade is dangerous - this might occur if an object was deleted and then re-saved by cascade at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2001) at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:589) at net.sf.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:1187) at net.sf.hibernate.engine.Cascades$3.cascade(Cascades.java:88) at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:258) at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:341) at net.sf.hibernate.impl.SessionImpl.preFlushEntities(SessionImpl.java:2285 ) at net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2015) at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2004) at com.universalred.dao.hibernate.BaseDAOHibernate.delete(BaseDAOHibernate. java:214) ... 12 more
I use this method given below to delete Objects, would it be possible that the ses.delete(obj) method has started some thread that hasn't finished?
protected synchronized void delete(Object obj) throws DAOException {
Session ses = null;
try {
ses = ThreadLocalSession.currentSession();
if (ses == null) {
throw new DAOException("No Session.");
}
ses.delete(obj);
ses.flush();
} catch (Exception e) {
throw new DAOException(e);
}
This is the method I use to save:
/**
* Save the given domain object to the database.
* * @param obj
* @throws DAOException
*/
protected synchronized void save(Object obj) throws DAOException {
Session ses = null;
try { ses = ThreadLocalSession.currentSession(); ses.saveOrUpdate(obj); // @TODO remove this flush if it is not needed ses.flush(); } catch (Exception e) { try { ses.connection().rollback(); } catch (Exception ex) { e.printStackTrace(); }; throw new DAOException(e); } }
Oisin Kim
Aurium
Tel: +353 1 6611132
Fax: +353 1 6615200
e-mail: [EMAIL PROTECTED]
web site: http://www.aurium.net
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