Michael Brackx created PDFBOX-4231:
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             Summary: cache file fallback if not writable
                 Key: PDFBOX-4231
                 URL: https://issues.apache.org/jira/browse/PDFBOX-4231
             Project: PDFBox
          Issue Type: Improvement
            Reporter: Michael Brackx


Fallback to the next file location if the current location for .pdfbox.cache is 
not writable.

Currently there is a fallback from pdfbox.fontcache to user.home to 
java.io.tmpdir as directory to write .pdfbox.cache, but this is only on the 
level of if the system property is defined.

It would be nice to fallback to the next directory if the file is not writable 
in a directory.

Without config and on a system where user.home is not writable pdfbox is quite 
slow, as the caching is tried each time.

Usually java.io.tmpdir is writable, so this would provide better performance 
out of the box.

The workaound is to configure the pdfbox.fontcache system property.



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