The problem occurred when downloading a file by using a protocol "sftp" in pushpull

[YunHee Kang]

Hi Brian,

I tried to download a file with sftp protocol in pushpull framework
and got two warnings and a severe error message as follows:
WARNING: Error occurred while connecting to RemoteSite: alias =
'SCPTESL2CO2'  url = 'sftp://agent.bu.ac.kr'  username = 'yhkang'
cdTestDir = 'null' maxConnections = '-1' : Failed to connect to host
agent.bu.ac.kr : reject HostKey: agent.bu.ac.kr
Aug 6, 2012 2:13:48 PM
org.apache.oodt.cas.pushpull.protocol.ProtocolHandler
getAppropriateProtocolBySite
WARNING: ProtocolFactory
org.apache.oodt.cas.protocol.sftp.JschSftpProtocolFactory is not
compatible with server at sftp://agent.bu.ac.kr
Aug 6, 2012 2:13:48 PM
org.apache.oodt.cas.pushpull.retrievalsystem.RetrievalSetup
retrieveFiles
SEVERE: Failed to finish downloading per property files
/home/yhkang/oodt-0.5/cas-pushpull/etc/examples/DirStructXmlParserFiles/SCPTESL2CO2.xml
: Failed to get appropriate protocol for RemoteSite: alias =
'SCPTESL2CO2'  url = 'sftp://agent.bu.ac.kr'  username = 'yhkang'
cdTestDir = 'null' maxConnections = '-1'
org.apache.oodt.cas.protocol.exceptions.ProtocolException: Failed to
get appropriate protocol for RemoteSite: alias = 'SCPTESL2CO2'  url =
'sftp://agent.bu.ac.kr'  username = 'yhkang' cdTestDir = 'null'
maxConnections = '-1'
        at 
org.apache.oodt.cas.pushpull.protocol.ProtocolHandler.getAppropriateProtocolBySite(ProtocolHandler.java:166)
        at 
org.apache.oodt.cas.pushpull.retrievalsystem.FileRetrievalSystem.changeToDir(FileRetrievalSystem.java:304)
        at 
org.apache.oodt.cas.pushpull.retrievalmethod.RemoteCrawler.processPropFile(RemoteCrawler.java:104)
        at 
org.apache.oodt.cas.pushpull.retrievalsystem.RetrievalSetup.retrieveFiles(RetrievalSetup.java:109)
        at org.apache.oodt.cas.pushpull.daemon.Daemon$1.run(Daemon.java:218)
        at java.lang.Thread.run(Thread.java:662)
Aug 6, 2012 2:13:48 PM org.apache.oodt.cas.pushpull.daemon.Daemon$1 run
INFO: Daemon with ID = 90121 on RMI registry port 9012 is shutting down

I think the warning message is related with an exception occurred in
the method  connect() of  JschSftpClient.java:
protected void connect(String host, final String username,
      final String password) throws ProtocolException {
    try {
      System.out.println(System.getProperty("user.home") + "/.ssh/known_hosts");
      jsch.setKnownHosts(System.getProperty("user.home") + "/.ssh/known_hosts");
      session = jsch.getSession(username, this.getRemoteSite().getURL()
          .getHost(), 22);
      session.setPassword(password);
      session.connect();
      sftpChannel = (ChannelSftp) session.openChannel("sftp");
      sftpChannel.connect();
    } catch (Exception e) {
      throw new ProtocolException("Failed to connect to host " + host + " : "
          + e.getMessage());
    }
  }

I make sure that there is no problem  when downloading  a file by  scp
command  without any password as follows:
scp 
yhk...@agent.bu.ac.kr://home/yhkang/oodt-0.5/TL2CO2N.005/2004.09.20/TES-Aura_L2-CO2-Nadir_r0000002147_F06_09.he5
.
TES-Aura_L2-CO2-Nadir_r0000002147_F06_09.he5  100%   88MB  87.9MB/s   00:01

Let me know how to fix the problem.

Thanks,
Yunhee