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https://issues.apache.org/jira/browse/NET-608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebb resolved NET-608.
----------------------
Resolution: Not A Problem
Fix Version/s: (was: 3.6)
> Exception when using addProtocolCommandListener with library
> org.apache.commons.net.telnet.TelnetClient
> -------------------------------------------------------------------------------------------------------
>
> Key: NET-608
> URL: https://issues.apache.org/jira/browse/NET-608
> Project: Commons Net
> Issue Type: Bug
> Components: Telnet
> Affects Versions: 3.5
> Environment: Windows 7, Java JDK 1.8,
> Reporter: Anthony Kearns
> Priority: Minor
> Labels: newbie
>
> According to the API documentation for WhoisClient and FTPClient these
> commands appear to support inherited functionality of
> addProtocolCommandListener.
> However, when i used this as follows....i get exceptions raised for
> TelnetClient and WhoisClient but not the FTPClient.
> Is this a bug or as designed? Or am I missing something ?
> import org.apache.commons.net.*;
> import org.apache.commons.net.ProtocolCommandListener;
> import org.apache.commons.net.ftp.FTPClient;
> import org.apache.commons.net.telnet.TelnetClient;
> import org.apache.commons.net.whois.WhoisClient;
> import java.io.PrintWriter;
> public class WhoisExample
> {
> public static void main(String args[])
> {
> try {
> WhoisClient whoisClient = new WhoisClient();
> whoisClient.addProtocolCommandListener(new
> PrintCommandListener(new PrintWriter(System.out)));
> }
> catch(Exception e) {
> System.out.println("whois client exception" + e);
> }
> try {
> TelnetClient telnetClient = new TelnetClient();
> telnetClient.addProtocolCommandListener(new
> PrintCommandListener(new PrintWriter(System.out)));
> }
> catch(Exception e) {
> System.out.println("telnet client exception" + e);
> }
> try {
> FTPClient ftpClient = new FTPClient();
> ftpClient.addProtocolCommandListener(new
> PrintCommandListener(new PrintWriter(System.out)));
> System.out.println("no ftp client exception here !");
> }
> catch(Exception e)
> {
> System.out.println("ftp client exception" + e);
> }
> }
> }
> I get the following exception....
> Caught: java.lang.NullPointerException Disconnected from the target VM,
> address: '127.0.0.1:3140', transport: 'socket' java.lang.NullPointerException
> at
> org.apache.commons.net.SocketClient.addProtocolCommandListener(SocketClient.java:772)
> at
> org.apache.commons.net.SocketClient$addProtocolCommandListener.call(Unknown
> Source)
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