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
dbDir = null;
	}
	
	/**
	 * Initialization for first time startup in this instance of JVM
	 */
	private void init() throws IOException
	{
		assert dbDir == null;
		
		
		
		String tempDir = System.getProperty( "java.io.tmpdir" );
		String timeStamp = String.valueOf(System.currentTimeMillis());
		String instanceId = Integer.toHexString( hashCode() );
		dbDir = tempDir + "/BIRTSampleDB_" + timeStamp + "_" + instanceId;
		logger.info( "Creating Sampledb database at location " + dbDir );
		(new File(dbDir)).mkdir();
		
		
		Bundle bundle = Platform.getBundle( SampleDBConstants.PLUGIN_ID );
		String dbEntryName = SAMPLE_DB_HOME_DIR + "/" + SAMPLE_DB_JAR_FILE;
		URL fileURL = bundle.getEntry( dbEntryName );
		if ( fileURL == null )
		{
			String errMsg = "INTERNAL ERROR: SampleDB DB file not found: " + dbEntryName;
			logger.severe( errMsg );
			throw new RuntimeException( errMsg );
		}