SAP DB JDBC Driver

Hi,
we need to connect to an just a SAP dataBase
so we 're using sapdbc.jar and configure
com/sap/dbtech/jdbcext/DataSourceSapDB (to enable pooling) in JDBC adapter page.
We get an error message when enabling this connection :

[ART.118.5042] Adapter Runtime (Connection): Unable to enable connection resource SPACe_SW_MIS_MAD_Miracle:SPACe_SW_MIS_MAD_Miracle.
[ART.118.5036] Adapter Runtime (Connection): Unable to configure connection manager.
null

A higher debug level doesn’t provide more information…
When using a simple java application on the same computer we can connect to this SAP database…

Thanks,