For implementing the EJB 2.0 persistence (CMP2.0), JOnAS relies on the JORM framework (see http://www.objectweb.org/jorm/index.html). JORM must adapt its object-relational mapping to the underlying database, and makes use of adapters called "mappers" for this purpose. Thus, for each type of database (and more precisely for each JDBC driver), the corresponding mapper must be specified in the jonas-ra.xml file of the deployed RAR. The mapperName element is provided for this purpose.
The JORM database mapper that has the property name mapperName can have the following values:
rdb: generic mapper (JDBC standard driver ...)
rdb.postgres: mapper for PostgreSQL
rdb.oracle8: mapper for Oracle 8 and lesser versions
rdb.oracle: mapper for Oracle 9
rdb.mckoi: mapper for McKoi Db
rdb.mysql: mapper for MySQL
Refer to the JORM documentation for a complete updated list.