[jira] [Commented] (VFS-558) java.lang.UnsupportedOperationException in FtpFileObject

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

    [ https://issues.apache.org/jira/browse/VFS-558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14281876#comment-14281876 ] 

Bernd Eckenfels commented on VFS-558:
-------------------------------------

Thanks for the report, I agree with your analysis, we need to check that.

BTW: I also think that the case of moving a file into an empty folder must be in the provider test suite. If you have some time, it would be best when you can start with exactly that reproducer.
BTW2: do you use OnCallRefresher on purpose, I can imagine that makes FTP quite slow.

> java.lang.UnsupportedOperationException in FtpFileObject
> --------------------------------------------------------
>
>                 Key: VFS-558
>                 URL: https://issues.apache.org/jira/browse/VFS-558
>             Project: Commons VFS
>          Issue Type: Bug
>    Affects Versions: 2.0
>            Reporter: L
>
> I am getting the following exception in my code:
> java.lang.UnsupportedOperationException
> 	at java.util.Collections$UnmodifiableMap.remove(Collections.java:1345)
> 	at org.apache.commons.vfs2.provider.ftp.FtpFileObject.onChildrenChanged(FtpFileObject.java:271)
> 	at org.apache.commons.vfs2.provider.AbstractFileObject.childrenChanged(AbstractFileObject.java:240)
> 	at org.apache.commons.vfs2.provider.AbstractFileObject.notifyParent(AbstractFileObject.java:1931)
> 	at org.apache.commons.vfs2.provider.AbstractFileObject.handleCreate(AbstractFileObject.java:1577)
> 	at org.apache.commons.vfs2.provider.AbstractFileObject.moveTo(AbstractFileObject.java:1866)
> 	at org.apache.commons.vfs2.impl.DecoratedFileObject.moveTo(DecoratedFileObject.java:241)
> 	at org.apache.commons.vfs2.cache.OnCallRefreshFileObject.moveTo(OnCallRefreshFileObject.java:184)
> ...
> I guess it is caused by the fact that children field is set to EMPTY_FTP_FILE_MAP at the moment onChildrenChanged() is invoked.
> I also do not like line 1866 in AbstractFileObject.java. To me it looks like it might be the real cause of the problem:
> FileObjectUtils.getAbstractFileObject(destFile).handleCreate(getType());
> Must it not be destFile.getType()?
> But even if I am right about AbstractFileObject.java:1866, FtpFileObject.onChildrenChanged() must be corrected as well.



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