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/SampledbPlugin.java
}
		catch (Exception e)
		{
			
			logger.info( "Expected exception: " + e.getLocalizedMessage() );
		}
	}
	
	/**
	 * Deletes all files created for the Derby database
	 */
	private void removeDatabase( )
	{
		logger.info( "Removing Sampledb DB directory at location " + dbDir );
		File dbDirFile = new File( dbDir );
		
		if ( !removeDirectory( dbDirFile ) )
		{
			assert dbDirFile != null;
			dbDirFile.deleteOnExit( );
			logger.info( "Fail to remove one or more file in temp db directory,but it will be removed when the VM exits: "
					+ dbDir );
		}
	}
	
	/**
	 * Do a best-effort removal of directory. 
	 */
	static boolean removeDirectory( File dir ) 
	{