Could not instantiate cache implementation

[Raghusham Sankargal]

Hi Colleagues,
I am trying to use Hibernate to insert a record on the Database. I am getting the error

Could not instantiate cache implementation

I could not figure it out why. Would anyone help me in this? Below is the hibernate.cfg.xml

 <?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">
com.sap.dbtech.jdbc.DriverSapDB
</property>
<property name="hibernate.connection.url">jdbc:sapdb://localhost/clrep</property>
<property name="hibernate.connection.username">dbadmin</property>
<property name="hibernate.connection.password">admin</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="hibernate.connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="hibernate.dialect">
                    org.hibernate.dialect.SAPDBDialect
</property>
<!-- Enable Hibernate's automatic session context management -->
<property name="hibernate.current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<property name="hibernate.cache.provider_class">
org.hibernate.cache.NoCacheProvider
</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
                <property name="format_sql">true</property>
                <property name="generate_statistics">true</property>
                <property name="use_sql_comments">true</property>                
<!-- All mapping files goes here -->
<mapping resource="hibernatefirst/Student.hbm.xml" />
                <!-- cache settings -->
                <class-cache class="hibernatefirst.Student" usage="read-write"/>
</session-factory>
</hibernate-configuration>
   

[Stanislav Burnashev]

i have the same problem too.
I try run Apache Roller 3.1 on SAP WebAs 7.
My hibernate config:

<?xml version='1.0' encoding='utf-8'?>
 
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        
        <!-- You can override this via the jdbc.XXX properties in roller-custom.properties -->
         <property name="connection.url">jdbc:mysql://localhost:3306/rollerdb</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.username">scott</property>
        <property name="connection.password">tiger</property>
 
                        
        <!-- You can override this via the hibernate.dialect property in roller-custom.properties -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
                       
        <property name="show_sql">false</property>
 
        <!-- use thread local Session context -->
        <property name="hibernate.current_session_context_class">thread</property>
 
        <!-- Hibernate L2 Caching -->
        <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property>
        <property name="hibernate.generate_statistics">true</property>
        <property name="hibernate.cache.use_structured_entries">true</property>
        
<!-- Delegate Hibernate?s transactions to the J2EE-Engine?s JTA -->
<property name="transaction.factory_class">
org.hibernate.transaction.JTATransactionFactory
</property>

<property name="transaction.manager_lookup_class">
org.hibernate.transaction.SAPWebASTransactionManagerLookup
</property>

        <!-- Map Roller pojo classes -->
        <mapping resource="org/apache/roller/pojos/RollerPropertyData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/UserData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/RoleData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/RollerConfigData.hbm.xml" />
 
        <mapping resource="org/apache/roller/pojos/WebsiteData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PermissionsData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/BookmarkData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/CommentData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/FolderAssoc.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/FolderData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/WeblogTemplate.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PingCategoryRestrictionData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/AutoPingData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PingQueueEntryData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/PingTargetData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/RefererData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/TaskLockData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/HitCountData.hbm.xml" />
 
        <mapping resource="org/apache/roller/pojos/WeblogEntryData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/WeblogEntryTagData.hbm.xml" />        
        <mapping resource="org/apache/roller/pojos/WeblogEntryTagAggregateData.hbm.xml" />                       
        <mapping resource="org/apache/roller/pojos/EntryAttributeData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/WeblogCategoryData.hbm.xml" />
        <mapping resource="org/apache/roller/pojos/WeblogCategoryAssoc.hbm.xml" />
        
        <mapping resource="org/apache/roller/planet/pojos/PlanetConfigData.hbm.xml" />
        <mapping resource="org/apache/roller/planet/pojos/PlanetGroupData.hbm.xml" />
        <mapping resource="org/apache/roller/planet/pojos/PlanetEntryData.hbm.xml" />
        <mapping resource="org/apache/roller/planet/pojos/PlanetSubscriptionData.hbm.xml" />
                
    </session-factory>
</hibernate-configuration>

Also, i have message in roller log:

Caused by: org.hibernate.cache.CacheException: net.sf.ehcache.ObjectExistsException: Cache org.apache.roller.pojos.BookmarkData already exists
at org.hibernate.cache.EhCacheProvider.buildCache(EhCacheProvider.java:105)
at org.hibernate.cache.CacheFactory.createCache(CacheFactory.java:61)
... 13 more
Caused by: net.sf.ehcache.ObjectExistsException: Cache org.apache.roller.pojos.BookmarkData already exists
at net.sf.ehcache.CacheManager.addCache(CacheManager.java:421)
at org.hibernate.cache.EhCacheProvider.buildCache(EhCacheProvider.java:98)
... 14 more
[ November 28, 2008: Message edited by: Stanislav Burnashev ]