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https://issues.apache.org/jira/browse/TIKA-1308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14372060#comment-14372060
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Tyler Palsulich commented on TIKA-1308:
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This would be a great feature! The default would need to be disabled, though,
since some files are larger than memory. And, as mentioned above, some parsers
require writing the output to a file in order to use the external parsing
library.
> Support in memory parse mode(don't create temp file): to support run Tika in
> GAE
> --------------------------------------------------------------------------------
>
> Key: TIKA-1308
> URL: https://issues.apache.org/jira/browse/TIKA-1308
> Project: Tika
> Issue Type: Improvement
> Components: parser
> Affects Versions: 1.5
> Reporter: jefferyyuan
> Labels: gae
> Fix For: 1.8
>
>
> I am trying to use Tika in GAE and write a simple servlet to extract meta
> data info from jpeg:
> {code}
> String urlStr = req.getParameter("imageUrl");
> byte[] oldImageData = IOUtils.toByteArray(new URL(urlStr));
> ByteArrayInputStream bais = new ByteArrayInputStream(oldImageData);
> Metadata metadata = new Metadata();
> BodyContentHandler ch = new BodyContentHandler();
> AutoDetectParser parser = new AutoDetectParser();
> parser.parse(bais, ch, metadata, new ParseContext());
> bais.close();
> {code}
> This fails with exception:
> {code}
> Caused by: java.lang.SecurityException: Unable to create temporary file
> at java.io.File.createTempFile(File.java:1986)
> at
> org.apache.tika.io.TemporaryResources.createTemporaryFile(TemporaryResources.java:66)
> at org.apache.tika.io.TikaInputStream.getFile(TikaInputStream.java:533)
> at org.apache.tika.parser.jpeg.JpegParser.parse(JpegParser.java:56)
> at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:242
> {code}
> Checked the code, in
> org.apache.tika.parser.jpeg.JpegParser.parse(InputStream, ContentHandler,
> Metadata, ParseContext), it creates a temp file from the input stream.
> I can understand why tika create temp file from the stream: so tika can parse
> it multiple times.
> But as GAE and other cloud servers are getting more popular, is it possible
> to avoid create temp file: instead we can copy the origin stream to a
> byteArray stream, so tika can also parse it multiple times.
> -- This will have a limit on the file size, as tika keeps the whole file in
> memory, but this can make tika work in GAE and maybe other cloud server.
> We can add a parameter in parser.parse to indicate whether do in memory parse
> only.
>
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