How to delete all JDBC drivers that are in a JAR file
Right-click an existing JDBC data source, then choose Edit from the context menu. Edit Data Source appears.
Choose Manage Drivers to open the driver manager.
Select the JAR file that contains the driver, then choose Delete.
BIRT Report Designer removes the JAR file and any drivers that it contains. BIRT Report Designer does not delete the JAR file from the file system.