Hi,
I have searched around the documentation, forum and various websites but haven't been able to find an answer to a seemingly easy question:
How do you completely evict a Map (HashMap, TreeMap, etc.) from the Hibernate PersistenceContext?
When I create or load an object with a simple HashMap that uses persistable objects for both keys and values and pass that object to evict(), the evict is only cascaded to the values of the Map and not to the keys (this has been checked by dumping the context of the PersistenceContext at various points).
This leads to various situations with stale state exceptions and the only work around so far has been to manually evict every object in the Map's keySet.
I assume there should be a way to do this simply with cascading.
Example mapping file:
Code:
<hibernate-mapping package="package">
<class name="Entity" table="Entity">
<id name="id" column="id">
<generator class="native" />
</id>
<map name="foobarmap" table="foobarmaptable" cascade="evict">
<key column="entityId" not-null="true" />
<map-key-many-to-many column="fooId" class="Foo" />
<many-to-many column="barId" class="Bar" />
</map>
</class>
</hibernate-mapping>
Example code that will evict the Entity and all Bar's from foobarmap but leaves the Foo's in the PersistenceContext:
Code:
Entity entity = entityDAO.read(1);
Hibernate.initialize(entity.getFoobarmap());
session.evict(entity);
Example code that will completely clear the PersistenceContext but is very annoying (and sometimes hard) to apply every time a Map is used within a transaction:
Code:
Entity entity = entityDAO.read(1);
Hibernate.initialize(entity.getFoobarmap());
for (Foo f: entity.getFoobarmap().keySet())
session.evict(f);
session.evict(entity);
Any help will be greatly appreciated :)
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