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I try to use Hibernate in dynamic-map entity mode, with bidirectional one-to-many relationship. But when I would like to save the parent object, the hibernate throws StackOverflowError exception.
But when I debug the hibernate source I found that getSanpshot method in the PersistentSet class try to clone the Set into a HashMap. However if the original Set has HashMap values, the method try to store this values with following procedure:

...
HashMap clonedSet = new HashMap( set.size() );
Iterator iter = set.iterator();
while ( iter.hasNext() ) {
Object copied = persister.getElementType().deepCopy( iter.next(), entityMode, persister.getFactory() );
clonedSet.put(copied, copied);
}
...

The new HashMap item key and value is same HashMap. When the Java try to determine hashCode an StackOverflowError exception generates.

I use the folowing code. How can I resolve this situation?

Roland

Hibernate version: 3.2.2

Mapping documents:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2007.03.08. 9:02:32 by Hibernate Tools 3.2.0.b9 -->
<hibernate-mapping>
<class entity-name="BelsoKaranten" table="BELSO_KARANTEN">
<id name="belsoKarantenId" type="long">
<column name="BELSO_KARANTEN_ID" precision="10" scale="0" />
<generator class="sequence">
<param name="sequence">seq_global</param>
</generator>
</id>
<property name="megyeId" type="long">
<column name="MEGYE_ID" precision="10" scale="0" not-null="true" />
</property>
<property name="vizsgKozegId" type="long">
<column name="VIZSG_KOZEG_ID" precision="10" scale="0" not-null="true" />
</property>
<property name="vizsgDatum" type="date">
<column name="VIZSG_DATUM" length="7" not-null="true" />
</property>
<property name="pecsetszam" type="string">
<column name="PECSETSZAM" length="10" />
</property>
<property name="vizsgalatHelye" type="string">
<column name="VIZSGALAT_HELYE" />
</property>
<property name="ugyfelId" type="java.lang.Long">
<column name="UGYFEL_ID" precision="10" scale="0" />
</property>
<set name="vizsgaltObjektums" inverse="true" cascade="all">
<key>
<column name="BELSO_KARANTEN_ID" precision="10" scale="0" not-null="true" />
</key>
<one-to-many class="VizsgaltObjektum" />
</set>
</class>
</hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2007.03.08. 9:02:32 by Hibernate Tools 3.2.0.b9 -->
<hibernate-mapping>
<class entity-name="VizsgaltObjektum" table="VIZSGALT_OBJEKTUM">
<id name="vizsgObjId" type="long">
<column name="VIZSG_OBJ_ID" precision="10" scale="0" />
<generator class="sequence">
<param name="sequence">seq_global</param>
</generator>
</id>
<many-to-one name="belsoKaranten" class="BelsoKaranten" fetch="select">
<column name="BELSO_KARANTEN_ID" precision="10" scale="0" not-null="true" />
</many-to-one>
<property name="proba1" type="string">
<column name="PROBA1" />
</property>
<property name="proba2" type="string">
<column name="PROBA2" />
</property>
</class>
</hibernate-mapping>

Code between sessionFactory.openSession() and session.close():

private void tryHibernate() {
Session s = HibernateUtil.currentSession();
Transaction tx = s.beginTransaction();

Map<Object, Object> belsoKaranten = new HashMap<Object, Object>();
Set set = new HashSet();
belsoKaranten.put("megyeId", new Long(3));
belsoKaranten.put("vizsgKozegId", new Long (3));
belsoKaranten.put("vizsgDatum", new Date(System.currentTimeMillis()));
belsoKaranten.put("pecsetszam", "0123456789");
belsoKaranten.put("vizsgalatHelye", "vizsgalatHelye");
belsoKaranten.put("ugyfelId", new Long(3));
belsoKaranten.put("vizsgaltObjektums", set);

Map<Object, Object> vizsgaltObjektum = new HashMap<Object, Object>();
vizsgaltObjektum.put("belsoKaranten", belsoKaranten);
vizsgaltObjektum.put("proba1", "proba1");
vizsgaltObjektum.put("proba2", "proba2");
set.add(vizsgaltObjektum);

Map<Object, Object> vizsgaltObjektum2 = new HashMap<Object, Object>();
vizsgaltObjektum2.put("belsoKaranten", belsoKaranten);
vizsgaltObjektum2.put("proba1", "proba1");
vizsgaltObjektum2.put("proba2", "proba2");
set.add(vizsgaltObjektum2);

s.save("BelsoKaranten", belsoKaranten);
tx.commit();
s.close();
}

Full stack trace of any exception that occurs:

Name and version of the database you are using:
Oracle 10

Debug level Hibernate log excerpt:

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