FileListDAO::Unable to pickup

We use HAFileAdapter to read files from a shared folder. Occasionally we find in the logs

FileListDAO::Unable to pickup [BLA], this error will ignored

2 Managed Servers at the same time have detected the file with their FilePoller, so the 2 of them at the same time run to get the exclusive lock on the file by updating the table FILEADAPTER_IN to set PROCESSED = 1, but only one of them gets it, the other gets no lock and logs a warning saying "I was unable to get the lock". This is not an issue, actually it should not even be a warning at all, since it's meant to work that way.

This is done in FileListDAO: public boolean claimLock(FileInfo fileInfo)