[
https://issues.apache.org/jira/browse/IO-340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428330#comment-13428330
]
Sebb commented on IO-340:
-------------------------
Do you have any reference to documentation for this behaviour?
If it is true, unfortunately file.length() returns 0 for a missing file, so it
won't detect an empty file.
> The use of file.exists() is failure prone. Where file.exists() is checked, it
> should be replaced with the following dual check: exists = ( file.exists()
> || file.length()>0 )
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: IO-340
> URL: https://issues.apache.org/jira/browse/IO-340
> Project: Commons IO
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.5, 3.x
> Environment: All
> Reporter: Wilf Middleton
> Labels: File, exists, false
> Fix For: 2.5, 3.x
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> The use of file.exists() is failure prone. In many cases the jvm can report
> that a file does not exist even when it does. This is due to the caching in
> the operating system.
> Since file.exists() is prone to report false values, a second check can and
> should be made to file.length()>0.
> Where file.exists() is checked, it should be replaced with the following dual
> check:
> A file more reliably exists if: file.exists() || file.length()>0
> Then if the file does not exist, file.length will be 0.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
