I have imported the project "ant" in eclipse, but I have the problem above in the package org.apache.tools.ant.taskdefs.optional.ssh, in the class SSHBase, for the followings lines of code:
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
bla bla bla...
final Session session = jsch.getSession(userInfo.getName(), host, port);
session.setConfig("PreferredAuthentications",
"publickey,keyboard-interactive,password");
session.setUserInfo(userInfo);