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((DefaultFileSystemManager) fsManager).close();

How can I connect to an SFTP server even if there is no entry in known_hosts?

JSch, the library that provides VFS with SFTP functionality, checks that the host one tries connecting to is a known host, i.e. has an entry in the file $HOME/.ssh/known_hosts. By default, connections to unkown hosts are rejected by throwing an exception. You can change this behaviour by specifying the strict host key checking option:

FileSystemOptions opts = new FileSystemOptions();
SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(opts, "no");
FileSystemManager fsManager = VFS.getManager();
FileObject foo = fsManager.resolveFile("sftp://login:password@host/foo.bar", opts);

// Do some stuff

foo.close();
((DefaultFileSystemManager) fsManager).close();