[jira] [Commented] (IO-376) FileUtils.copyFile for the locked file (windows)

["Sebb (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IO-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13632754#comment-13632754 ] 

Sebb commented on IO-376:
-------------------------

Is this even possible from Java? 
Last time I checked, I could not find a way to open a locked file.

A work-round might be to use a system call to run DOS copy - but does that even work?
                
> FileUtils.copyFile for the locked file (windows)
> ------------------------------------------------
>
>                 Key: IO-376
>                 URL: https://issues.apache.org/jira/browse/IO-376
>             Project: Commons IO
>          Issue Type: New Feature
>          Components: Streams/Writers
>    Affects Versions: 2.4
>         Environment: Windows
>            Reporter: Peter B.
>            Priority: Minor
>
> The use case:
> - log4j writes to the file using RollingFileAppender.
> - in parallel I need to read the file contents for later manipulation (storing it's contents elsewhere)
> Problem on windows:
> - I open FileInputStream for reading from file
> - when using IOUtils.copy(InputStream input, OutputStream output) exception is thrown:
> {code} 
> java.io.IOException: The process cannot access the file because another process has locked a portion of the file
> {code} 
> It would be great to have API enabling to copy contents of the locked file (on windows) to OutputStream.
> The method available in the API currently:
> {code:java} 
> FileUtils.copyFile(File input, OutputStream output)
> {code} 
> does the job, except for the files that are locked (in the windows environment) as they're currently written to.
> Some of the functionality is already in use in the: Tailer
> However (non-bloked) copying full contents is not provided.
> I'd need to retrieve a snapshot of the file.
> Not sure about the right API, but generally I see 2 options:
> - custom (File)InputSteam implementation or maybe
> - custom FileUtils.copyFile(File input, OutputStream output)

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