FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
This is the original source code of the method sun.net.ftp.impl.FtpClient#nameList():

    /**
     * Issues a NLST path command to server to get the specified directory
     * content. It differs from {@link #list(String)} method by the fact that
     * it will only list the file names which would make the parsing of the
     * somewhat easier.
     *
     * {@link #completePending()} <b>has</b> to be called once the application
     * is finished writing to the stream.
     *
     * @param path a <code>String</code> containing the pathname of the
     * directory to list or <code>null</code> for the current working
     * directory.
     * @return the <code>InputStream</code> from the resulting data connection
     * @throws IOException if an error occurs during the transmission.
     */
    public InputStream nameList(String path) throws sun.net.ftp.FtpProtocolException, IOException {
        Socket s;
        s = openDataConnection( " NLST " + path);
        if (s != null) {
            return createInputStream(s.getInputStream());
        }
        return null;
    }

As can be seen, there is no handling of a null as the path parameter in this code at all (although documented).
A null as path doesn't lead to the expected result.




REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Passing an empty String instead of a null as the method argument.