Info: Working, Starting Stage 6 - Setting Context Parameters.
Note: There is an error in the tutorial under "Creating a Resource Reference to the Data Source", point 3.
The resource type in screen shot is incorrect. Correct is Resource Type: javax.sql.ConnectionPoolDataSource.
If you don't use it, then you get the exception - WARNING: StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception org.apache.derby.client.am.SqlException: Table/View 'CATEGORY' does not exist.