无法删除由Java API KML生成的KML文件

我使用api JavaAPIforKML版本2.2生成了一个kml文件，如下所示：

         try {
            File kmlFile =files.get(TypeOfFile.kml);
            kmlMaker.marshal(kmlFile);
            logger.debug("The file " + kmlFile.getPath() + " has been created");
        } catch (FileNotFoundException e) {
            logger.error(e.getMessage());
            throw new CoreServiceException("Error while the creation of KML file", e);
        }

生成后，我尝试用以下代码删除kml文件，但无效：

         for(int i=0;i<directoryFiles.length;i++){

            String filePath = directoryFiles[i].getPath();

            boolean fileIsDeleted = false;
            try {
                FileDeleteStrategy.FORCE.delete(directoryFiles[i]);
                fileIsDeleted = true;
            } catch (IOException e) {
                e.printStackTrace();
            }

            if(fileIsDeleted) logger.debug("The file " + filePath + " has been deleted");
            else logger.error("The file " + filePath + " hasn't been deleted");
        }

@Test
public void deleteKML() throws Exception {
    Kml kmlMaker = new Kml();
    File kmlFile = new File("C:\\Dev\\Tmp\\KML\\TEST1-913289299.kml");
    kmlMaker.marshal(kmlFile);

    Assert.assertTrue(kmlFile.delete());

} 

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提前感谢您的建议和帮助。

我看到这个问题尚未解决：