Question

I have a problem with Commons VFS. I want to connect to a directory using SFTP and list it. Here is the code:

FileSystemOptions opts = new FileSystemOptions();
SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(opts, "no");
FileSystemManager fsManager = VFS.getManager();

FileObject sourceDir = fsManager.resolveFile(sourceUrl, opts);
FileObject targetDir = fsManager.resolveFile(config.get("to"));

for (FileObject sourceFile : sourceDir.getChildren()) { // here is the problem
    FileObject targetFile = fsManager.resolveFile(targetDir + "/" + nodeName + "_"
            + sourceFile.getName().getBaseName());
    logger.debug("Copying files. Source: " + sourceFile.getName().getPath() + " Target: "
            + targetFile.getName().getPath());
}

It seems that the fsManager resolves it correctly but getChildren() fails. I found out that the sourceDir is an IMAGINARY type; the following code says it

logger.debug(sourceDir.getType());

I checked the file and it’s an ordinary folder – not a link or something like that.

Error

org.apache.commons.vfs2.FileNotFolderException: Could not list the contents of "sftp://path/to/dir" because it is not a folder.
    at org.apache.commons.vfs2.provider.AbstractFileObject.getChildren(AbstractFileObject.java:693)
    at pkg.services.impl.QuartzJobEventLog.downloadEventLogs(QuartzJobEventLog.java:64)
    at pkg.services.impl.QuartzJobEventLog.executeJob(QuartzJobEventLog.java:37)
    at pkg.services.impl.AbstractQuartzJob.execute(AbstractQuartzJob.java:25)
    at $QuartzJob_1360635dbcd.execute($QuartzJob_1360635dbcd.java)
    at org.quartz.core.JobRunShell.run(JobRunShell.java:203)
    at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)

Answer 1

According to the documentation getting “directory contents” is not supported for the SFTP filesystem.