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https://issues.apache.org/jira/browse/VFS-558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14281944#comment-14281944
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L commented on VFS-558:
-----------------------
Re: BTW2: do you use OnCallRefresher on purpose, I can imagine that makes FTP
quite slow.
Well, I do use CacheStrategy.ON_CALL, so yes, it is OnCallRefreshFileObject.
My code has some checks before performing moveTo to verify the destination file
is not there so I am not overwriting it.
My tests gave me quite a lot of spurious warnings saying the file IS there
before the rename while I quite sure it was not there.
Adding the CacheStrategy.ON_CALL helped a lot but sometimes I still get
resulted in most of the false positive
> 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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