vaadin - How to know that Download has been completed -

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i sending file download @ client browser using following code:-

    filedownloadresource fdr = new filedownloadresource(file, app);     btnget.getwindow().open(fdr);

everything works fine when add file.delete(); after that, exception file or directory not exist. can understand before download component done file, file getting deleted. there way notification download complete , safe delete file server?


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