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
if ( isDeregistered( className ) )
		{
			return true;
		}
		Driver driver = findDriver( className, null );
		if ( driver != null )
		{
			try
			{
				if (logger.isLoggable(Level.FINER))
					logger.finer("Registering with DriverManager: wrapped driver for " + className );
				if ( registeredDrivers.containsKey( className ) )
				{
					DriverManager.deregisterDriver( new WrappedDriver( driver, className ) );
					registeredDrivers.remove( className );
				}
				registeredDrivers.put( className, DRIVER_DEREGISTERED );
			}
			catch ( SQLException e)
			{
				
				logger.log( Level.WARNING, 
						"Failed to deRegister wrapped driver instance.", e);
			}
		}
		return true;
	}
	
	/**
	 * Update the driver by the given class name from DriverManager