cannot do 2nd level cache

Question

in my applicationcontext.xml

<bean id="annotatedsessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="packagesToScan" value="testonly.package.model" />
<property name="hibernateProperties">
    <props>
        <prop key="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</prop>
        <prop key="hibernate.show_sql">true</prop>
        <prop key="hibernate.format_sql">true</prop>
        <prop key="hibernate.use_sql_comments">true</prop>
        <prop key="hibernate.cglib.use_reflection_optimizer">true</prop>
        <prop key="hibernate.hbm2ddl.auto">update</prop>
        <prop key="hibernate.c3p0.min_size">5</prop>
        <prop key="hibernate.c3p0.max_size">20</prop>
        <prop key="hibernate.c3p0.timeout">1800</prop>
        <prop key="hibernate.c3p0.max_statements">50</prop>
        <prop key="hibernate.cache.provider_class">
                org.hibernate.cache.EhCacheProvider
        </prop>
        <prop key="hibernate.cache.use_second_level_cache">true</prop>
        <prop key="hibernate.cache.use_query_cache">true</prop>
    </props>
</property>
<property name="dataSource">
    <ref bean="dataSource" />
</property>

In my Entity

@Entity
@Cache(usage=CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)

@Table(name = "TestPOJOCATEGORY")
@NamedQueries({
 @NamedQuery(name = "TestPOJOcategory.findAll", query = "SELECT h FROM TestPOJOcategory h"),
 @NamedQuery(name = "TestPOJOcategory.findById", query = "SELECT h FROM TestPOJOcategory h WHERE h.id = :id"),
 @NamedQuery(name = "TestPOJOcategory.findByCategoryname", query = "SELECT h FROM TestPOJOcategory h WHERE h.categoryname = :categoryname")})
public class TestPOJOcategory implements Serializable {

In My Dao

public List<TestPOJOcategory> getAllCategory(final String keyword, final int nFirst,
        final int nPageSize,
        final String sortColumnId,
        final boolean bSortOrder) {

  List<TestPOJOcategory> result = (List<TestPOJOcategory>) getHibernateTemplate().execute(new HibernateCallback() {
    public Object doInHibernate(Session session) {
      Criteria crit = session.createCriteria(TestPOJOcategory.class, "TestPOJOcategory")
       .add(Restrictions.ilike("categoryname", keyword))
       .addOrder(bSortOrder ? Order.asc(sortColumnId) : Order.desc(sortColumnId))
       .setFirstResult(nFirst).setMaxResults(nPageSize);
      System.out.println("why still call from DB? suppose to call from cache");
      return crit.list();
    }
  });
  return result;
}

echcache.xml

 <cache name="testonly.package.model.TestPOJOcategory"
        maxElementsInMemory="200"
        eternal="true"
        overflowToDisk="false"
        timeToIdleSeconds="300"
        timeToLiveSeconds="600"
    />

Each time I call the dao, it will still call from DB. Why?

Answer 1

First of all, your System.out.println() statement will get executed every time whether or not 2nd level cache is accessed because such access takes place within list() method.

Secondly, Criteria - much like Query - does not automatically use 2nd level cache; configuration properties you've specified merely enable it to be used. You still need to explicitly mark each Query / Criteria instance as cacheable by calling setCacheable(true):

Criteria crit = ...;
crit.setCacheable(true);
return crit.list();

On a side note, since you're using HibernateTemplate you might as well use it right :-) and get rid of manual doInHibernate wrapper:

public List<TestPOJOcategory> getAllCategory(final String keyword, final int nFirst,
    final int nPageSize,
    final String sortColumnId,
    final boolean bSortOrder) {

  DetachedCriteria crit = DetachedCriteria.forClass(TestPOJOcategory.class);
  crit.add(Restrictions.ilike("categoryname", keyword))
   .addOrder(bSortOrder ? Order.asc(sortColumnId) : Order.desc(sortColumnId));
  getHibernateTemplate().setCacheQueries(true); // works on both queries and criteria
  return (List<TestPOJOcategory>) getHibernateTemplate()
   .findByCriteria(crit, nFirst, nPageSize);
}