Not sure why your java service is accessing a database resource directly, but the error is related to attempting to connect to Oracle using the OCI protocol when your IS does not have access to the OCI drivers. The WM JDBC Adapter User’s Guide covers configuring IS properly so that the JDBC adapter can use the OCI protocol. This may be helpful to you in having your java service use OCI.
However, you should probably re-think having java service connect to database resources directly.
Mark
#webMethods#Integration-Server-and-ESB#Adapters-and-E-Standards