Bug 123042 When do some operation on the data drive manager, the eclipse may be broken.
Description: When do some operation on the data drive manager, the eclipse may be broken. Steps to reproduce: 1. new a JDBC data resource, and click the "Manage drivers" 2. delete a Jar file , and click "OK" 3. click the "Manage drivers" , add the deleted Jar File and click "OK" 4. click the "Manage drivers" and click the 'Drivers' tab, and set a 'Display name' and 'URL Template' and clcik 'OK' 5. click the "Manage drivers" and click the 'Drivers' tab, and delete the 'Display name' and 'URL Template' and clcik 'OK' Actual result: The eclipse is broken. Expect result: The eclipse runs in good shape.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/dialogs/JdbcDriverManagerDialog.java
tabItem.setText( JdbcPlugin.getResourceString( "driverManagerDialog.text.Drivers" ) ); 
	}
	
	/**
	 * initialize jarMap,driverMap and Viewer
	 */
	private void initialize( )
	{
		jarMap = new HashMap( );
		driverMap = new HashMap( );
		jarsToBeCopied = new Hashtable( );
		jarsToBeDeleted = new Hashtable( );
		jarsToBeCopiedRuntime = new Hashtable( );
		jarsToBeDeletedRuntime = new Hashtable( );
		
		updateJarMap( );
		updateDriverMapInit( );
		refreshJarViewer( );
		refreshDriverViewer( );
		updateJarButtons( );
		updateDriverButtons( );
	}
	
	/**
	 * update jarMap, read setting from preference store. Jar files under ODA
	 * driver directory will be displayed.
	 */
	private void updateJarMap( )
	{
		File jarPath = JarFile.getDriverLocation( );