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
URLClassLoader urlClassLoader = createClassLoader( jdbcDriverFiles );
		List driverList = getJDBCDriverInfoList( jdbcDriverFiles,
				urlClassLoader );
		jdbcDriverInfos.addAll( driverList );
		for ( int i = 0; i < driverList.size( ); i++ )
		{
			JDBCDriverInformation info = (JDBCDriverInformation) driverList.get( i );
			driverNameMap.put( info.getDriverClassName( ), info );
		}
	}
	/**
	 * Create a URLClassLoader based on the given file list
	 * @param jdbcDriverFiles a File List
	 * @return URLClassLoader
	 */
	private static URLClassLoader createClassLoader( List jdbcDriverFiles )
	{
		
		URL[] urlList = new URL[jdbcDriverFiles.size()];
		for ( int i = 0; i < jdbcDriverFiles.size(); i++ )
		{
			try
			{
				urlList[i] = new URL( "file", null, ( (File) jdbcDriverFiles.get( i ) ).getAbsolutePath( ) );
			}
			catch ( MalformedURLException e )
			{
				ExceptionHandler.showException( PlatformUI.getWorkbench( )
						.getDisplay( )
						.getActiveShell( ),