failed to lazily initialize a collection

novotny · **Joined:** Sun May 02, 2004 8:04 am **Posts:** 36

Hi,

I'm updating my code (a web application) to use Hibernate 3. At some point when my app starts up, I get this stack trace:

Code:

org.hibernate.LazyInitializationException: failed to lazily initialize a collection (org.gridlab.gridsphere.services.core.portal.PortalConfigSettings.attributes) - no session or session was closed
        at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:179)
        at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:47)
        at org.hibernate.collection.PersistentMap.get(PersistentMap.java:122)
        at org.gridlab.gridsphere.services.core.portal.PortalConfigSettings.getAttribute(PortalConfigSettings.java:77)

The class PortalConfigSettings looks like the following and the code fails in the getAttributes method shown:

Code:

public class PortalConfigSettings {
    private String oid = null;
    private boolean canCreateAccount = false;
    private Set defaultGroups = null;
    private String defaultTheme = null;
    private Map attributes = new HashMap();
   ...
    // setter and getters

  // code fails in here!!
   public String getAttribute(String name) {
        return (String) attributes.get(name);
    }
 

}

My mapping file looks like:

Code:

<hibernate-mapping>
    <class        name="org.gridlab.gridsphere.services.core.portal.PortalConfigSettings
"
        table="portalconfigsettings">

        <id
            name="oid"
            column="gsoid"
            type="java.lang.String"
            length="32"
            >
            <generator class="uuid.hex"/>

        </id>
        <property name="CanUserCreateAccount" type="boolean" column="canusercreateacct"/>
        <property name="DefaultTheme" type="string" column="defaulttheme"/>
        <set name="DefaultGroups" cascade="all">
            <key column="defaultgroup_oid"/>
            <one-to-many class="org.gridlab.gridsphere.portlet.impl.SportletGr
oup"/>
        </set>
        <map name="attributes" table="portalconfigattributes">
            <key column="gsoid"/>
            <index column="attribute" type="string"/>
            <element column="value" type="string"/>
        </map>
    </class>
</hibernate-mapping>

Any idea why this worked in 2.1, or what I need to do to make it work in Hibernate 3?

Thanks very much, Jason

anthony · **Posted:** Tue Apr 05, 2005 5:16 am

read the migration guide

lazy default behaviour has change, in your case just add fetch="join" in the mapping file, but read the migration guide

novotny · **Joined:** Sun May 02, 2004 8:04 am **Posts:** 36

I tried adding fetch="join" like so:

<map name="attributes" table="portalconfigattributes" fetch="join">
<key column="gsoid"/>
<map-key column="attribute" type="string"/>
<element column="value" type="string"/>
</map>

but that doesn't seem to work. At start up I create my object for the first time:

Code:

PortalConfigSettings configSettings = new PortalConfigSettings();
configSettings.setDefaultGroups(defaultGroups);

try {
session = factory.openSession();
            tx = null;
            tx = session.beginTransaction();

} catch (HibernateException e) {
            if (tx != null) {
                tx.rollback();
            }
            log.error("Could not complete transaction", e);
            e.printStackTrace();
            throw e;
        } finally {
            session.close();
        }

and I get this stacktrace:

Code:

76358 [http-8080-Processor25] (AbstractFlushingEventListener.java:277) ERROR org.hibernate.event.def.AbstractFlushingEventListener  - Could not synchronize database state with session
org.hibernate.HibernateException: Unexpected row count: 0 expected: 1
        at org.hibernate.jdbc.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:32)
        at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:880)
        at org.hibernate.action.CollectionRecreateAction.execute(CollectionRecreateAction.java:23)
        at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:239)
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:223)