Hi I am new to Hibernate.I have used Struts 2 and Hibernate 3.1.3 How can I Implement second level caching.
I tried in following way but I could not achieved. Please guide me to solve my problem.
Note :I did not mentioned anything about cache in my session factory class

hibernate.cfg
-------------
<property name="hibernate.cache.use_second_level_cache">true</property>
<property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property>

ehcache.xml
------------
<diskStore path="c://cache"/>

<defaultCache
maxElementsInMemory="10000"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="true"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="120"
/>

<cache name="fi.qaim.opinionprofiler.model.SurveyVO"
maxElementsInMemory="300"
eternal="true"
overflowToDisk="true"
/>
</ehcache>
Survey.hbm.xml :
---------------
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

<class name="fi.qaim.opinionprofiler.model.SurveyVO"
table="survey">
<cache usage="read-write"/>
<id name="surveyId" column="survey_key">
<generator class="native" />
</id>
<property name="categoryId" column="category_key" />
<property name="customerId" column="customer_key" />
<property name="surveyName" column="name" />
<property name="surveyDescription" column="description" />
<property name="defaultLanguageKey" column="default_lang_key" />
<property name="redirectUrl" column="redirect_url" />
<property name="status" column="status" />
<property name="showDashboard" column="show_dashboard" />
<property name="startDate" column="start_date" />
<property name="endDate" column="end_date" />
<property name="created" column="created" />
<property name="updated" column="updated" />
<property name="responseGoal" column="response_goal" />
<property name="totalResponses" column="total_responses" />
<property name="surveyProgress" column="survey_progress" />
<many-to-one name="category" column="category_key" fetch="join"
class="fi.qaim.opinionprofiler.model.CategoryVO" insert="false" update="false" not-null="true" />
<many-to-one name="customerVo" column="customer_key" fetch="join"
class="fi.qaim.opinionprofiler.model.CustomerVO" insert="false" update="false" not-null="true" />
<many-to-one name="languageVo" column="default_lang_key" fetch="join"
class="fi.qaim.opinionprofiler.model.LanguageVO" insert="false" update="false" not-null="true" />
</class>
</hibernate-mapping>

What could not be achieved ?
Whats your problem?

Do you get exceptions?
Is the application performing selects which you don't excpect?

I did not get any exception. With in the c://cache folder some DATA file are created but always that DATA file size is zero.

Consider that overflowToDisk="true" means that only after 'overflow' entities are written to disk.
With maxElementsInMemory set to "300" it means that you must load more than 300 distinct SurveyVO
instances in order that Ehcache begins to write to disk.
Did you load more than 300 SurveyVO objects?