Hello,

I have a problem by fetching data. Normaly I want to get Object when they are needed, so I set the mapping option for my relation with lazy="false". But when I load a structure from DB with an object that only should be loaded if neccessary, I get the following error:

first some facts:
- I use Hibernate version 3.0.5

this is a part of my mapping:

...
<many-to-one name="singleValueTest" class="de.fhg.iwu.traceability.data.tests.SingleValueTest" column="VALUETEST_ID" unique="false" cascade="all" lazy="false" />
...

and

...
<joined-subclass name="SingleValueTest" table="SINGLEVALUETEST">
<key column="VALUETEST_ID" />

<joined-subclass name="EqualsTest" table="EQUALSTEST">
<key column="VALUETEST_ID" />

<property name="nominalValue" not-null="true" type="serializable" length="1000000">
<column name="NOMINALVALUE" />
</property>
</joined-subclass>

<joined-subclass name="BoundsTest" table="BOUNDSTEST">
<key column="VALUETEST_ID" />

<property name="lowerBound" type="double" not-null="true" >
<column name="LOWERBOUND" index="ind_BOUNDSTEST_LOWERBOUND" />
</property>

<property name="upperBound" type="double" not-null="true" >
<column name="UPPERBOUND" index="ind_BOUNDSTEST_LOWERBOUND" />
</property>

</joined-subclass>

</joined-subclass>
...

the following error occurs:

14.09.2005 13:47:57 org.hibernate.LazyInitializationException <init>
SCHWERWIEGEND: could not initialize proxy - the owning Session was closed
org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:53)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:80)
at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:134)
at de.fhg.iwu.traceability.data.tests.SingleValueTest$$EnhancerByCGLIB$$df2757de.deepCopy(<generated>)
...

THANX for help - Tino Langer

Your problem does not come from the mapping. It comes from your session management.

If you have entity A and entity B (A lazy relation to B)

There can be two possible reasons:

1 - our session is closed when you call A.getB
or,
2 -You have an open session, but it is not the on in which A was loaded.


For case 1, make sure that the scope of the session spans your whole process.

For case 2, either reload A from the DB prior to calling A.getB, or try to reassociate A to the session.

Hope that helps,

Post your dao.