A JDBC driver for ObjectDB can be useful in various scenarios, and particularly for using ObjectDB with reporting and BI tools (other than BIRT).
Requests for JDBC driver were discussed in various threads on ObjectDB forum:
As a first step, the target should be a read only JDBC driver, for SELECT queries with JPQL syntax (not SQL, except SQL queries that are also valid in JPQL). This may open ObjectDB for read-only applications, such as reporting.
ObjectDB - Fast Object Database for Java (JPA/JDO)