Seem to have found my issue. The following code works:
public class SFTPConnection {
private static JSch jsch = new JSch();
private Session session = null;
private Channel channel = null;
private ChannelSftp sftpChannel = null;
public void connect(final int port, final String host,
final String username, final String password, final String basePath)
throws JSchException, SftpException {
this.session = jsch.getSession(username, host, port);
this.session.setPassword(password);
this.session.setConfig("StrictHostKeyChecking", "no");
this.session.connect();
this.channel = this.session.openChannel("sftp");
this.channel.connect();
this.sftpChannel = (ChannelSftp) this.channel;
this.sftpChannel.cd(basePath);
}
public void exit() {
// this.sftpChannel.exit();
// this.channel.disconnect();
this.session.disconnect();
}
}
On 27 February 2012 23:25, Phil Hewitt <[email protected]> wrote:
> I am receiving an error when I connect to an SFTP server that I have
> previously connected to just 10 minutes before.
>
> Please find below the code fragments I think I have made a mistake with.
>
> public class SFTPConnection {
> private Session session = null;
> private Channel channel = null;
> private ChannelSftp sftpChannel = null;
>
> public void connect(final int port, final String host, final String
> username, final String password, final String basePath)
> throws JSchException, SftpException {
> final JSch jsch = new JSch();
> this.session = jsch.getSession(username, host, port);
> this.session.setPassword(password);
> this.session.setConfig("StrictHostKeyChecking", "no");
> this.session.connect();
> this.channel = this.session.openChannel("sftp");
> this.channel.connect();
> this.sftpChannel = (ChannelSftp) this.channel;
> this.sftpChannel.cd(basePath);
> }
>
> public void exit() {
> this.sftpChannel.exit();
> this.channel.disconnect();
> this.session.disconnect();
> }
> }
>
> These fragments are called by another class that uses the connect() method
> to connect to the server, changes directory using chdir, reads the
> directory using ls, copies files out of the directory using get, removes
> the files from the directory using rm and then uses the exit() method above
> to close the connections.
>
> Ten minutes later it re-runs the code and then it throws an Exception. I
> assume because I have not correctly closed the connection properly
> previously. See below for the stack dump:
>
> Caused by: com.jcraft.jsch.JSchException: java.lang.NullPointerException
> at com.jcraft.jsch.Session.connect(Session.java:175)
> at com.jcraft.jsch.Session.connect(Session.java:160)
> at
> com.enappsys.wrappers.sftp.SFTPConnection.connect(SFTPConnection.java:51)
> at
> com.enappsys.wrappers.sftp.SFTPConnectionFactory.createSFTPConnection(SFTPConnectionFactory.java:49)
> ... 3 more
> Caused by: java.lang.NullPointerException
> at com.jcraft.jsch.JSch.getConfig(JSch.java:291)
> at com.jcraft.jsch.Session.getConfig(Session.java:1881)
> at com.jcraft.jsch.Session.connect(Session.java:171)
> ... 6 more
>
>
> Any help and advice would be appreciated
>
> Regards,
>
> Phil Hewitt
>
--
Phil Hewitt
Tel: +44 (0) 1642 671111
Mob: +44 (0) 7703 483614
Skype: mrphewitt
Email: [email protected]
Web: www.enappsys.com
Address: EnAppSys Ltd, Arnison House, 139B The High Street, Yarm,
Stockton-on-Tees TS15 9AY U.K.
This communication contains information that is confidential and may also
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