maxIndex++;  sessionTempDirStr = tempRootDirStr + File.separator + prefix + maxIndex; File file = new File( sessionTempDirStr ); file.mkdir( );  return sessionTempDirStr;
		private String createSessionTempDir( )		{			this.createTempRootDir();						String sessionTempDirStr;			final String prefix = "session_";			// second create the seesion temp folder			String[] filesName = new File( tempRootDirStr ).list( );			Arrays.sort( filesName, new Comparator( ) {				public int compare( Object o1, Object o2 )				{					String f1 = (String) o1;					String f2 = (String) o2;					int index1 = f1.indexOf( prefix );					int index2 = f2.indexOf( prefix );					if ( index1 < 0 || index2 < 0 )						return 0;					Integer i1 = Integer.valueOf( f1.substring( index1							+ prefix.length( ) ) );					Integer i2 = Integer.valueOf( f2.substring( index2							+ prefix.length( ) ) );					return i1.compareTo( i2 );				}			} );			// find which extension should be used			int maxIndex = -1;			for ( int i = filesName.length - 1; i >= 0; i-- )			{				int index = filesName[i].indexOf( prefix );				if ( index == 0 )				{					maxIndex = Integer.valueOf( filesName[i].substring( index							+ prefix.length( ) ) ).intValue( );					break;				}			}			maxIndex++;			sessionTempDirStr = tempRootDirStr					+ File.separator + prefix + maxIndex;			File file = new File( sessionTempDirStr );			file.mkdir( );			return sessionTempDirStr;		}