user645212 wrote:"Maybe". Oracle DBMSes are quite backwards compatible so you'll certainly have some success using ojdbc14 to connect to Oracle11g. But there is absolutely no guarantee that you'll not run into trouble at some point in time. There really is only one real solution: upgrade Java.
can I use Oracle Database 10g Release 2 JDBC Drivers (this one - ojdbc14.jar (1,569,316 bytes) - classes for use with JDK 1.4 and 1.5) against Oracle Database 11g ?
or can I use Oracle Database 11g Release 1 JDBC Drivers (this one - ojdbc5.jar (1,890,499 bytes) - Classes for use with JDK 1.5.) with java 1.4 ?No.