error in SystemSchedule.clearTempDir()

[qianliniu]

why format the path before delete dir? formatFilePath will change the folder path from absolute path to relative path. this change cause the delete failed.

      final String download = fileUtils.formatFilePath(downloadDir);
        final String temp = fileUtils.formatFilePath(tempDir);
        final String csv = fileUtils.formatFilePath(csvDir);
        CLEAR_TEMPDIR_THREADPOOL.execute(() -> FileUtils.deleteDir(new File(download)));
        CLEAR_TEMPDIR_THREADPOOL.execute(() -> FileUtils.deleteDir(new File(temp)));
        CLEAR_TEMPDIR_THREADPOOL.execute(() -> FileUtils.deleteDir(new File(csv)));

public String formatFilePath(String filePath) {
     if(filePath == null) {
         return null;
     }
     return filePath.**replace(fileBasePath, EMPTY)**.replaceAll(File.separator + "{2,}", File.separator);
 }

Error: Exception in thread "pool-3-thread-18" java.lang.NullPointerException at edp.core.utils.FileUtils.deleteDir(FileUtils.java:185) at edp.davinci.schedule.SystemSchedule.lambda$clearTempDir$0(SystemSchedule.java:75) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)