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Solved it. Just added these lines

   //import statements for the publisher
   import org.ros.concurrent.CancellableLoop;
   import org.ros.node.topic.Publisher;


    final Publisher<std_msgs.String> publisher =
    connectedNode.newPublisher("chatter", std_msgs.String._TYPE);//added this line above the try block
    //added the following lines of code below  log.info("Classifier's output: \"" + da + "\"");
    std_msgs.String str = publisher.newMessage();
    str.setData(da);
    publisher.publish(str);

Solved it. Just added these lines

   //import statements statement for the publisher
   import org.ros.concurrent.CancellableLoop;
   import org.ros.node.topic.Publisher;


    final Publisher<std_msgs.String> publisher =
    connectedNode.newPublisher("chatter", std_msgs.String._TYPE);//added this line above the try block
    //added the following lines of code below  log.info("Classifier's output: \"" + da + "\"");
    std_msgs.String str = publisher.newMessage();
    str.setData(da);
    publisher.publish(str);