we are using the JT400 driver for our AS400 JDBC connections.
Configure your JDBC connection and use the following params:
Transaction Type: NO_TRANSACTION
serverName: Your DNS address or IP address
User and password: User and password established on your system
Other Properties: blank
Connection management Properties: (might need to adjust to your needs)
Enable Connection Pooling: True
Minimum Pool Size: 1
Maximum Pool Size: 10
Pool Increment Size: 1
Block Timeout: 1000
Expire Timeout: 1000
Startup Retry Count: 0
Startup Backoff Timeout: 10
Not sure I understood your question correctly.
JDBC is just a mechanism to connect to different data bases using APIs provided in Java. WM JDBC adapter normally supports all types of JDBC connectivity provided you have the appropriate jar for it - including AS400.
On the other hand, you can also connect to AS400 through AS400 adapter which is not a JDBC connection.