[ https://issues.apache.org/jira/browse/VFS-558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
L updated VFS-558: ------------------ Comment: was deleted (was: 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)