EhCache + hibernate

Question

I have the following problem: I have a query which return me 35 results and I would like to keep in second level cache:

public List<Product> getAllProducts() {
        Session session = this.sessionfactory.getCurrentSession();
        String queryString = "from com.ewave.upromotions.objects.Product product where product.active=:active";
        Query query = session.createQuery(queryString); 
        query.setBoolean("active", true);
        query.setCacheable(true);
        query.setCacheRegion("productCache");
        List<Product> products =query.list();
        return products;
    }

My object is the following:

@Entity
@Table(name="products",schema="test11")
@Cacheable
@Cache( usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Product implements Serializable {

//all setters and getters ommited:

}

my ehcache.xml file is in /src/ directory:

<ehcache>  
    <diskStore path="java.io.tmpdir"/>  
    <defaultCache maxElementsInMemory="10000"  
        eternal="false"  
        timeToIdleSeconds="120"  
        timeToLiveSeconds="120"  
        overflowToDisk="false"/>  
    <cache name="hibernate.test.org.hibernate.cache.UpdateTimestampsCache"   
        maxElementsInMemory="10000"  
        eternal="false"  
        timeToIdleSeconds="120"  
        timeToLiveSeconds="120"  
        overflowToDisk="true"/>  
    <cache name="hibernate.test.org.hibernate.cache.StandardQueryCache"   
        maxElementsInMemory="10000"  
        eternal="false"  
        timeToIdleSeconds="120"  
        timeToLiveSeconds="120"  
        overflowToDisk="true"/>
     <cache name="com.vanilla.objects.Product"
        maxElementsInMemory="300"
        eternal="false"
        overflowToDisk="false"
        timeToIdleSeconds="600"  
        timeToLiveSeconds="600"  
        />  
       <cache name="productCache" 
       maxElementsInMemory="100" 
       eternal="true" 
       overflowToDisk="false" />

</ehcache>

and my Hibernate configuration is:

<props>
    <prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop> 
    <prop key="hibernate.cache.use_second_level_cache">true</prop> 
     <prop key="hibernate.show_sql">true</prop> 
  <prop key="hibernate.cache.use_query_cache">true</prop> 
  <prop key="hibernate.cache.provider_class">net.sf.ehcache.hibernate.SingletonEhCacheProvider</prop>
  <prop key="hibernate.connection.release_mode">after_transaction</prop>
  <prop key="hibernate.cache.provider_configuration_file_resource_path">/ehcache.xml</prop>
  </props>

My problem is the following: when bringing page for first time I see the select which brings all 35 results:

when I refresh page, instead of bringing 35 objects from cache I see 35 select statements which queries objects by id one by one.

What's wrong?

score 5 · Accepted Answer · answered Jul 18 '11 at 01:19

It was happening to me when query was cached but objects were not. In you sample code I see that query refers to com.ewave.upromotions.objects.Product but you have cache region defined for com.vanilla.objects.Product. And you didn't provide any cache region to the Product class. So I'd suggest that you explicitly specify cache region for Product and define it in cache configuration. To start, I would try the same region for query and object, just to see if it works, and then try separate configurations.

EhCache + hibernate

1 Answers1