---------- Forwarded message ---------
From: Alvaro Nogueira <alvaro.nogue...@flywire.com>
Date: Mon, Jun 23, 2025 at 10:54 AM
Subject: InputStream consumed by Tika.detect
To: <user-subscr...@tika.apache.org>
Hello,
We've been using Tika version 3.1.0 to successfully detect MimeTypes from
files before uploading them to our S3.
However, after v3.2.0 upgrade, we've noticed that the original inputStream
is being consumed entirely for certain file extensions.
The affected extensions seem to be all for Microsoft files, pointing us to
the POIFSContainerDetector, which was actually changed for this release.
This is the list of extensions we've tested with errors: doc, docx, odt,
ppt, pptx, xls, xlsx
And these ones work as before: bmp, csv, gif, jpeg, jpg, pdf, png, rtf,
svg, txt
Here's some code to reproduce the issue:
class TikaBugReport {
// affected extensions: doc, docx, odt, ppt, pptx, xls, xlsx
public static void main(String[] args) throws IOException {
String fileName = "Test.docx";
InputStream inputStream = new
ClassPathResource(fileName).getInputStream();
checkFileMime(inputStream, fileName);
}
public static void checkFileMime(InputStream inputStream, String fileName) {
try {
Tika tika = new Tika();
System.out.println("InputStream available bytes before
processing: " + inputStream.available());
System.out.println("InputStream supports mark: " +
inputStream.markSupported());
Metadata metadata = new Metadata();
TikaInputStream tikaInputStream = TikaInputStream.get(inputStream);
System.out.println("Original InputStream available bytes
after TikaInputStream.get(): " + inputStream.available());
String mimeType = tika.detect(tikaInputStream, metadata);
// Debug: Check state after detection
System.out.println("Original InputStream available bytes
after tika.detect(): " + inputStream.available());
System.out.println("TikaInputStream available bytes after
tika.detect(): " + tikaInputStream.available());
if (inputStream.available() == 0) {
throw new IllegalStateException("InputStream is empty
after TikaInputStream creation");
}
} catch (Exception e) {
System.out.printf("Mime check exception for file '%s':
[%s]%n", fileName, e.getMessage());
}
}
}
--
Thank you and regards,
Álvaro Nogueira
Senior Software Engineer
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