MySQL and J2EE 1.4 AppServer

Question

Hi I was wondering if anyone has gotten MySQL to work with CMP EJB's on the J2EE 1.4 AppServer? This is my story so far. Using the admin console I created a new Connection Pool named MySQL, it uses the com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource class as the Datasource Classname, all other settings I left as default. I added three properties which the MySQL driver expects to be passed: username, password, and databaseName. Once this is done I can ping the MySQL server successfully. Next I add a new JDBC Resource named jdbc/MySQL. Then using deploytool I change the Sun-specific Settings CMP Resource JNDI Name to jdbc/MySQL. When I try to deploy my EJB, this is when the problem occurs. I get the following error from the server:
-- Fatal Error from EJB Compiler -- JDO74030: JDOCodeGenerator: Caught an IOException initializing CMP code generation for application 'vwcm' module '/opt/sunappserver/domains/versaqual/applications/j2ee-modules/': JDO7001: Cannot find resource com/sun/jdo/spi/persistence/generator/database/MYSQL.properties.
Would anyone know what to do to fix this situation?

Answer 1

I am using Sun App Server 7 and I believe the same concept can be applied to J2EE 1.4. In the CMP EJBs you have create the persistence manager to persist the data with the database. The JDBC resources are for making connection to the database, not for persistence. And the cmp jdbc resource should be named as jdo/MySql rather jdbc/MySql.
Here is how you have to provide in the sun-ejb-jar file for the CMP beans.
<cmp-resource>
<jndi-name>jdo/MySql</jndi-name>
</cmp-resource>
You should find another option in the app server configuration console for "persistence managers".
In the persistence manager console create a new persistence manager called jdo/MySql. It will ask you the following information. (As per App server 7)
JNDI ----- jdo/MySql
Description ------ Provide desc
Factory Class ------- com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerFactoryImpl
Connection Pool ------- Provide your connection pool from the combo box.
A JDBC resource will be automatically created to associate the Persistence Manager run-time with the specified Connection Pool.
Persistence Manager Enabled: (Check the check box)
Once you submit this information, it will create a JDBC resource in the name "jdo/MySqlPM". You can check whether it is created or not under the JDBC resource link in the app server configuration console. If it is created, then you should not have any other problem.
After performing the above steps try to deploy, which I believe you should have any problem.
Thanks