Not able to evict the associated entiries of Hibernate 2nd level cache - ehcache

Question

I am using Hibernate 4.17 and use ehcache as second level cache. In the definition of hbm file, I declare the cache at the class level.

<class name="com.test.Program" table="program" mutable="false">

    <cache usage="nonstrict-read-write" />
 ....

I have 1-to-many association defined as follows

 <list name="parameters" cascade="none" batch-size="100">
    <cache usage="nonstrict-read-write" />
    <key column="program_oid"/>
    <index column="sequence" />
    <one-to-many class="com.test.ProgramParameter"/>
  </list>

I have a region defined for main class - Program in the ehcache.xml. The issue is whenever I evict the 2nd level cache using

HibernateUtil.getSessionFactory().getCache().evictEntityRegion("com.test.Program");

All the entities of com.test.Program are evicted but not com.test.Program.parameters Further more, If I try to evict com.test.Program.parameters entities like above, I get the exception "Unknown Entity".

How do I evict the entities of associated class?

codemonkey codemonkey · Accepted Answer · 2018-04-24T06:21:25

Try:

HibernateUtil.getSessionFactory().getCache().evictCollectionRegion("com.test.Program.parameters");

The cache setting on the parameters list will store just the identifiers of the entities in that list in a separate collection cache, using the identifier of the parent Program entity as the key.

The ProgramParameter entities themselves will not be cached unless you have a corresponding cache setting on that entity, e.g.

<class name="com.test.ProgramParameter" table="program_parameter" mutable="false">

    <cache usage="nonstrict-read-write" />
 ....

Whenever you use a collection cache, you should cache the entities as well otherwise Hibernate will still need to fetch each entity in the collection from the database.

Not able to evict the associated entiries of Hibernate 2nd level cache - ehcache

1 Answers