上传的文件会自动删除？

Question

我编写了一个servlet来使用表单上传文件。在我使用绝对路径之前： String path = "C:\\Folder\\SubFolder\\";并使用此路径保存我上传的文件，并且工作正常。我将上传的路径更改为：String path = request.getServletContext().getRealPath("")+"\\Folder\\SubFolder\\";，现在我发现文件会在一段时间后自动删除。

我的问题是，它是否被视为临时文件并在一段时间后被删除或是否是其他原因？这是我的代码：

uploadFile file = new uploadFile();// upload the file!
boolean checker = false;
String uploadPath = request.getServletContext().getRealPath("")+"\\uploads\\riparazione\\"; 
checker =  file.doImport(idRiparazione, request, response, sourceFile, uploadPath); 

doImport功能如下：

public boolean doImport(String name, HttpServletRequest request, HttpServletResponse response, FileItem item, String uploadPath) {
    DiskFileItemFactory factory = new DiskFileItemFactory();
    factory.setSizeThreshold(THRESHOLD_SIZE);
    factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

    ServletFileUpload upload = new ServletFileUpload(factory);
    upload.setFileSizeMax(MAX_FILE_SIZE);
    upload.setSizeMax(MAX_REQUEST_SIZE);

    // creates the directory if it does not exist
    File uploaddir = new File(uploadPath);
    if ( !uploaddir.exists())
        uploaddir.mkdirs();

    String fileName = new File(item.getName()).getName();
    fileName = name + "-" + fileName;
    String filePath = uploadPath + File.separator + fileName;

    try {
        // saves the file on disk
        File storeFile = new File(filePath);
        if ( !storeFile.exists())
            item.write(storeFile);
        else return false;
    } catch(Exception e) {
        e.printStackTrace();
    }
    return true;
}

我正在使用xampp作为Apache tomcat 7.0，eclipse和OS是windows 7.