Bug 191404 Connection is still successful after delete drivers[0703]
Description: Create a Sqlserver datasource and dataset, then delete the jtds driver. Click "Test Connection" is still successful, and the dataset still works. Build Version:2.2.0.v20070607-0630 Steps to reproduce: 1. Add a jtds driver, and create a Sqlserver connection and dataset. 2. Go to "Manage JDBC Drivers" dialog, and delete the driver. 3. Click "Test Connection", the connection is successful. 4. Click "Preview Results" in "Edit Data Set" dialog, it works. Expected Result: Delete driver will lose the connection.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/util/JdbcToolKit.java
{
	
	private static List jdbcDriverInfos = null;
	
	private static List failLoadFileList = null;
	
	private static HashMap driverNameMap = null;
	private static Hashtable file2Drivers = null;
	
	private static final Class DriverClass = Driver.class;
	/**
	 * Resets cached jdbc driver list to null, force reget the information when
	 * required next time.
	 */
	public static void resetJdbcDriverNames( )
	{
		jdbcDriverInfos = null;
		failLoadFileList = null;
		driverNameMap = null;
		file2Drivers = null;
	}
	 
	 /**