Oracle in JDBC (at least when I used it) was completely happy with you having multiple statements active on the same cnonection (though ech could only have one result set).

The JDBC driver architecture JDBC provides a programming-level interface for uniformly communicating with databases.

JDBC stands for the Java database connectivity protocol. Based on the same X/Open CLI standard as Microsoft's object database connectivity protocol, the JDBC applications programmable interface ...

Hassle-free JDBC programming The framework outlined in this article allows queries, updates, and transactions to execute without the hassle and redundancy typically experienced with such operations.