Ssh – Run FNDLOAD command on unix server from windows using Jsch

I'm trying to run an FNDLOAD command using Jsch after connecting to my unix server through ssh. But the command is giving me the following error

bash: FNDLOAD: command not found

Also if I try to read any environment variables like JAVA_TOP, FND_TOP etc.its not giving any output. But all the other commands like reading a .sh file are working fine using this code. The code is as shown:

import java.io.InputStream;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import java.util.Properties;

public class ShellExecuter {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String host = "10.111.111.11";
        String user = "username";
        String password = "password";
        String FND_TOP = "/u01/oracle/fs1/appl/fnd/12.0.0";
        String command = "FNDLOAD user/pass O Y DOWNLOAD " + FND_TOP + "/patch/115/import/abc.lct "
                + "/home/applvis/JAVA/abc.ldt PROGRAM APPLICATION_SHORT_NAME=XX "
                + "CONCURRENT_PROGRAM_NAME=UPLOAD_TOOL";
        try {

            Properties config = new Properties();
            config.put("StrictHostKeyChecking", "no");
            JSch jsch = new JSch();
            Session session = jsch.getSession(user, host, 22);
            session.setPassword(password);
            session.setConfig(config);
            session.connect();
            System.out.println("Connected");

            Channel channel = session.openChannel("exec");
            ((ChannelExec) channel).setCommand(command);
            channel.setInputStream(null);
            ((ChannelExec) channel).setErrStream(System.err);

            InputStream in = channel.getInputStream();
            channel.connect();
            byte[] tmp = new byte[1024];
            while (true) {
                while (in.available() > 0) {
                    int i = in.read(tmp, 0, 1024);
                    if (i < 0) {
                        break;
                    }
                    System.out.print(new String(tmp, 0, i));
                }
                if (channel.isClosed()) {
                    System.out.println("exit-status: " + channel.getExitStatus());
                    break;
                }
                try {
                    Thread.sleep(1000);
                } catch (Exception ee) {
                }
            }
            channel.disconnect();
            session.disconnect();
            System.out.println("DONE");
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

Can anyone please help me in reading environment variables and performing FNDLOAD commands. I don't understand what am I doing wrong.

PS: FNDLOAD utility is properly installed on the server. I'm able to achieve the desired result when I execute the same command from putty.

Does anyone have any suggestion or anything to help me with this issue. I'm struck. I have tried many ways but nothing works. Any help is appreciated.