SFTP connection with SSH2 mode

Question

I need to to make an SFTP connection to an SFTP site with the SSH2 mode using Java code in PL/SQL developer.
And the connection requires an RSA key to start with. We got the RSA key, but I have some trouble with the code.
Below is the code I've got so far, and I don't know how to turn on the SSH2 mode, and I don't know how to include the RSA key:
public static void SFTP_Login (java.lang.String inSite, int inPort, java.lang.String inUser_ID, java.lang.String inPassword)
throws Exception
System.setProperty("java.net.preferIPv4Stack", "TRUE");
try
conn = new Connection(inSite, inPort);
conn.connect();
String[] auth = conn.getRemainingAuthMethods(inUser_ID);
boolean tKeyboardInteractive = false;
boolean tPasswordAuthentication = false;
int i;
for (i = 0; i < auth.length; ++i)
if (auth.equals("password")) {
tPasswordAuthentication = true;
} else if (auth.equals("keyboard-interactive")) {
tKeyboardInteractive = true;
boolean isAuthenticated = false;
if (tPasswordAuthentication) {
isAuthenticated = conn.authenticateWithPassword(inUser_ID, inPassword);
} else if (tKeyboardInteractive) {
ki.response = inPassword;
isAuthenticated = conn.authenticateWithKeyboardInteractive(inUser_ID, ki);
if (isAuthenticated == false)
throw new IOException("Authentication failed.");
catch(Exception ex)
SFTP_Logout_JAVA();
throw(ex);
}

Answer 1

Thanks for your answer..
There is nothing to keep secret from, But I just didn't get more detailed error message than this:
ORA-29532: Java call terminated by uncaught Java exception: java.io.IOException
I really wish I was able to get more specific error msgs, so that I can better debug the issue.
Do you know if connecting to an SFTP site using SSH2 mode with RSA keys need any special Java libraries?
In other words, maybe I need to Import other java libraries?
These are the ones I'm already importing:
import com.trilead.ssh2.Connection;
import com.trilead.ssh2.SFTPv3Client;
import com.trilead.ssh2.SFTPv3FileHandle;
import com.trilead.ssh2.SFTPv3DirectoryEntry;
import com.trilead.ssh2.InteractiveCallback;
import org.apache.commons.net.ProtocolCommandListener;
import org.apache.commons.net.ProtocolCommandEvent;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPConnectionClosedException;
import org.apache.commons.net.ftp.FTPReply;
import org.apache.commons.net.ftp.FTPSClient;
import org.apache.commons.net.ftp.FTPFile;
Thank you,