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https://issues.apache.org/jira/browse/VFS-558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14282877#comment-14282877
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Bernd Eckenfels commented on VFS-558:
-------------------------------------
Thanks for testing! I really hope to release soon (so you better not find new
bugs :))
Would you mind moving the discussion to us...@common.apache.org mailing list?
It would be interesting if you can summarize your tests.
If ON_CALL is faster than ON_RESOLVE (which is the default I hope :) I would
expect there are some strange timeout issues. If you can have a look at the FTP
server command logfile it would be interesting to compare the number and types
of commands used in both cases. (and just a reminder the CacheStrategy is only
dealing with directory content and file metadata, so if you mostly transfer
file content it is not much of a change).
> 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
> Assignee: Bernd Eckenfels
> Fix For: 2.1
>
>
> 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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