First of All.......*Environment: Drools BRMS 4.0.3, JBossAS 4.2.2, MySql 5* Hi Guys, It's making me waste all the day trying to set "JNDIDatabasePersistenceManager" as mysql-repository persistence manager. I show u the issue... *In MySql I've got an empty "brms-db" schema.* *In JBoss default workspace I've got the following datasource definition in mysql-ds.xml:* *<datasources> <local-tx-datasource> <jndi-name>jdbc/MySQLDB</jndi-name> <connection-url>jdbc:mysql:///brms-db</connection-url> <driver-class>com.mysql.jdbc.Driver</driver-class> <user-name>drools</user-name> <password>drools</password> <min-pool-size>5</min-pool-size> <max-pool-size>20</max-pool-size> <idle-timeout-minutes>5</idle-timeout-minutes> <exception-sorter-class-name> com.mysql.jdbc.integration.jboss.ExtendedMysqlExceptionSorter </exception-sorter-class-name> <valid-connection-checker-class-name> com.mysql.jdbc.integration.jboss.MysqlValidConnectionChecker </valid-connection-checker-class-name> </local-tx-datasource> </datasources>* *I've got the following persistence manager set-up in <jboss_home>\bin\repository.xml:* * <PersistenceManager class=" org.apache.jackrabbit.core.persistence.db.JNDIDatabasePersistenceManager"> <param name="dataSourceLocation" value="java:jdbc/MySQLDB"/> <param name="schema" value="mysql"/> <param name="schemaObjectPrefix" value="${wsp.name}_"/> <param name="externalBLOBs" value="false" /> </PersistenceManager> * *Once I start JBoss I get back the following exception:* *2007-11-28 16:48:36,766 INFO [STDOUT] ERROR 28-11 16:48:36,743 ( RepositoryImpl.java:initStartupWorkspaces:389) Failed to initialize workspace 'default' javax.jcr.RepositoryException: Cannot instantiate persistence manager org.apache.jackrabbit.core.persistence.db.JNDIDatabasePersistenceManager: null: null at org.apache.jackrabbit.core.RepositoryImpl.createPersistenceManager( RepositoryImpl.java:1184) at org.apache.jackrabbit.core.RepositoryImpl.access$600(RepositoryImpl.java :103) at org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.initialize( RepositoryImpl.java:1758) at org.apache.jackrabbit.core.RepositoryImpl.initWorkspace( RepositoryImpl.java:603) at org.apache.jackrabbit.core.RepositoryImpl.initStartupWorkspaces( RepositoryImpl.java:386) at org.apache.jackrabbit.core.RepositoryImpl.<init>(RepositoryImpl.java :293) at org.apache.jackrabbit.core.RepositoryImpl.create(RepositoryImpl.java :584) at org.apache.jackrabbit.core.TransientRepository$2.getRepository( TransientRepository.java:245)* *...* I tried to replace "* org.apache.jackrabbit.core.persistence.db.JNDIDatabasePersistenceManager*" with "*org.apache.jackrabbit.core.persistence.db.SimpleDbPersistenceManager* " and It *DOES* Work ....so I think we can exclude it's something related to "JackRabbit API" null references... Have U got any idea? What is the reason? Did I miss any binding concernig the DataSource definition????? Is it just impossible to bind JackRabbit to any datasources although JNDI APIs do exist????? Is it a matter related to the "weird JackRabbit JNDI client"?? Let me know. Thank You again. Massi