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
InputStream dbFileStream = new BufferedInputStream( fileURL.openStream( ) );
		ZipInputStream zipStream = new ZipInputStream( dbFileStream );
		ZipEntry entry;
		while ( (entry = zipStream.getNextEntry()) != null )
		{
			File entryFile = new File( dbDir, entry.getName() );
			if ( entry.isDirectory() )
			{
				entryFile.mkdir();
			}
			else
			{
				
				OutputStream os = new FileOutputStream( entryFile );
		        byte[] buf = new byte[4000];
		        int len;
		        while ( (len = zipStream.read(buf)) > 0) 
		        {
		            os.write(buf, 0, len);
		        }
		        os.close();
			}
		}
			
		zipStream.close();
		dbFileStream.close();
	}
	/**
	 * Gets Derby connection URL
	 * */