Bug 173039 Exception is shown when accessing a db on an unknown host
Create a report Add a datasource and specified a invalid host name Click on test connection An oversized error dialog appears showing a stack trace Expected: a simple error such as "Host xxx is not accessible" should be displayed instead.
data/org.eclipse.birt.report.data.oda.jdbc/src/org/eclipse/birt/report/data/oda/jdbc/JDBCDriverManager.java
* 
	 * @param String className
	 */
	public void updateStatus( String className )
	{
		if ( isDeregistered( className ) )
		{
			registeredDrivers.remove( className );
		}
	}
	
	/**
	 * Check whether the driver class name is deregistered
	 * 
	 * @param String className
	 * @return true if the driver class name is deregistered
	 */
	private boolean isDeregistered( String className )
	{
		return this.registeredDrivers.containsKey( className )
				&& registeredDrivers.get( className ).equals( DRIVER_DEREGISTERED );
	}
	
	private void loadAndRegisterDriver( String className, String driverClassPath ) 
		throws OdaException
	{
		if ( className == null || className.length() == 0)
			
			return;
		if ( isDeregistered( className ) )