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From david.pe...@thomsonreuters.com
Subject [vfs] bug: zip file is not being closed
Date Wed, 30 Nov 2011 11:52:35 GMT
Hi.

 

(I tried to sign up to VFS Jira but it fails again and again on the
captcha for some reason, so I post here.)

 

I found a bug in vfs2: 

When you open an input stream of a zip entry inside a zip file, the zip
file is kept locked even after closing the zip file object.

Below is code to reproduce. 

 

I'll be thankful if someone would be able to open a Jira issue, since I
can't sign up.

 

Thanks

David.

 

 

 

import org.apache.commons.io.IOUtils;

import org.apache.commons.vfs2.FileContent;

import org.apache.commons.vfs2.FileObject;

import org.apache.commons.vfs2.FileSystemManager;

import org.apache.commons.vfs2.VFS;

 

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

 

/**

* Demonstrate a bug in commons vfs2:

* Closing a zip file object doesn't release the underlying file lock.

*

* Discovered on:

* Windows 7 pro SP1

* Java 1.6.0_20-b02 64-bit

* VFS maven version: org.apache.commons:commons-vfs2:2.0

*/

public class BugReport {

                public static void main(String args[]) throws Exception
{

                                String zipFile =
"zip:C:\\some-file.zip!some-zip-entry.xml";

 

                                FileSystemManager vfs =
VFS.getManager();

                                FileObject file =
vfs.resolveFile(zipFile);

                                FileContent content = file.getContent();

                                InputStream is =
content.getInputStream(); // actually locks the file

 

                                // Optionally consume the input stream.

                                // This implicitly call close() on the
input stream when finish reading.

                                // See
DefaultFileContent.FileContentInputStream class and
MonitorInputStream.read()

                                // But either way, the zip file is still
locked.

                                ByteArrayOutputStream buffer = new
ByteArrayOutputStream();

                                IOUtils.copy(is, buffer);

 

                                // The following expected to unlock the
file but they don't

                                IOUtils.closeQuietly(is);

                                content.close();

                                file.close();  // doesn't close the
embedded ZipFileSystem which takes a file lock.

 

                                // Only this releases file lock. 

 
vfs.closeFileSystem(file.getFileSystem());

                }

}

 

 

 


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