This is the Java code for a simple console application using the TerrJava API.

import java.io.BufferedReader;
import java.io.InputStreamReader;

import com.tibco.terr.TerrJava;

public class TerrConsoleExample {

  public static void main(String[] args) throws Throwable {
    System.out.println("TerrConsoleExample:");

    // set up output/input handlers
    TerrJava.OutputHandler out = new TerrJava.OutputHandler() {
      public void write(String data, boolean prompted) {
        System.out.print(data);
      }
    };
    TerrJava.InputHandler in = new TerrJava.InputHandler() {
      public String readLine() {
        try {
          BufferedReader bin = new BufferedReader(
              new InputStreamReader(System.in));
          String cmd = bin.readLine();
          return cmd;
        } catch (Exception ex) {
          return "";
        }
      }
    };
    TerrJava.setOutputHandler(out);
    TerrJava.setInputHandler(in);

    // start Spotfire Enterprise Runtime for R engine
    TerrJava.startEngine();
    // repeatedly read input lines and evaluate them
    String resultCode = "";
    String prompt = "";
    StringBuffer expression = new StringBuffer();

    while (true) {
      // get prompt string from Spotfire Enterprise Runtime for R
      if (resultCode.equals("IncompleteString")) {
        prompt = TerrJava.evaluateToString("getOption('continueString')");
      } else if (resultCode.equals("IncompleteExpression")) {
        prompt = TerrJava.evaluateToString("getOption('continue')");
      } else {
        prompt = TerrJava.evaluateToString("getOption('prompt')");
        expression.setLength(0);
      }

      out.write(prompt, true);
      String line = in.readLine();
      // ignore empty input lines, except when we are reading a multi-line string
      if (line.isEmpty() && !resultCode.equals("IncompleteString")) {
        continue;
      }

      // accumulate multi-line expression, until we can parse it
      if (expression.length() > 0) {
        expression.append("\n");
      }
      expression.append(line);

      resultCode = TerrJava.evaluateInteractive(expression.toString());

      // exit if engine just evaluated q()
      if (resultCode.equals("Quit")) {
        resultCode = "Success";
        break;
      }

      // print error message if any
      if (resultCode.equals("EvaluationError") ||
        resultCode.equals("ParserError")
        ) {
        String error = TerrJava.getLastErrorMessage();
        if (!error.isEmpty()) {
          out.write(error + "\n", false);
        }
      }
    }
  }
}