Bug 211004 Failed to remove temp db directory after running multiple reports
Description: I use Report Engine API to do runAndrender, run and dataextract tasks on multiple reports. Before the Platform started, I change the temp folder(System.setProperty( "java.io.tmpdir", TEMP_HOME )). Each task is closed after it finished and I shutdown the Platform after all the tasks finished. In log I found "Fail to remove one or more file in temp db directory,but it will be removed when the VM exits: D:\BIRT_NG\temp/BIRTSampleDB_1196129572031_10a6ae2". In temp folder the BIRTSampleDB_XXX is still here but not removed. I think it is the issue when remove the Temp sampleDB. Build number: 2.3.0.v20071127-0630
data/org.eclipse.birt.report.data.oda.sampledb/src/org/eclipse/birt/report/data/oda/sampledb/SampleDBJDBCConnectionFactory.java
{
	private static final Logger logger = Logger.getLogger( SampleDBJDBCConnectionFactory.class.getName( ) );
	private Driver derbyDriver;
	private DerbyClassLoader derbyClassLoader;
	
	/**
	 * Creates a new JDBC connection to the embedded sample database.
	 * 
	 * @see org.eclipse.birt.report.data.oda.jdbc.IConnectionFactory#getConnection(java.lang.String,
	 *      java.lang.String, java.util.Properties)
	 */
	public Connection getConnection( String driverClass, String url,
			Properties connectionProperties ) throws SQLException
	{
		if ( ! driverClass.equals( SampleDBConstants.DRIVER_CLASS) )
		{
			
			logger.log( Level.SEVERE, "Unexpected driverClass: " + driverClass );
			throw new SQLException("Unexpected driverClass " + driverClass);
		}
		if ( ! url.equals(SampleDBConstants.DRIVER_URL) )
		{
			
			logger.log( Level.WARNING, "Unexpected url: " + url );
			throw new SQLException("Classic Models Inc. Sample Database Driver does not recognize url: " + driverClass);
		}
		String dbUrl = SampledbPlugin.getDBUrl( );