import java.sql.*;
import java.util.HashMap;
import java.util.ArrayList;
import java.util.Map;

import java.net.URI;
import java.net.URISyntaxException;

import static spark.Spark.*;
import spark.template.freemarker.FreeMarkerEngine;
import spark.ModelAndView;
import static spark.Spark.get;

import com.heroku.sdk.jdbc.DatabaseUrl;

import static javax.measure.unit.SI.KILOGRAM;
import javax.measure.quantity.Mass;
import org.jscience.physics.model.RelativisticModel;
import org.jscience.physics.amount.Amount;

public class Main {

  public static void main(String[] args) {

    port(Integer.valueOf(System.getenv("PORT")));
    staticFileLocation("/public");

    //get("/hello", (req, res) -> "Hello World");
      get("/hello", (req, res) -> {
          RelativisticModel.select();
          
          String energy = System.getenv().get("ENERGY");
          
          Amount<Mass> m = Amount.valueOf(energy).to(KILOGRAM);
          return "E=mc^2: " + energy + " = " + m.toString();
      });

//    get("/", (request, response) -> {
//            Map<String, Object> attributes = new HashMap<>();
//            attributes.put("message", "Hello World!");
//
//            return new ModelAndView(attributes, "index.ftl");
//        }, new FreeMarkerEngine());

    /*get("/db", (req, res) -> {
      Connection connection = null;
      Map<String, Object> attributes = new HashMap<>();
      try {
        connection = DatabaseUrl.extract().getConnection();

        Statement stmt = connection.createStatement();
        stmt.executeUpdate("CREATE TABLE IF NOT EXISTS ticks (tick timestamp)");
        stmt.executeUpdate("INSERT INTO ticks VALUES (now())");
        ResultSet rs = stmt.executeQuery("SELECT tick FROM ticks");

        ArrayList<String> output = new ArrayList<String>();
        while (rs.next()) {
          output.add( "Read from DB: " + rs.getTimestamp("tick"));
        }

        attributes.put("results", output);
        return new ModelAndView(attributes, "db.ftl");
      } catch (Exception e) {
        attributes.put("message", "There was an error: " + e);
        return new ModelAndView(attributes, "error.ftl");
      } finally {
        if (connection != null) try{connection.close();} catch(SQLException e){}
      }
    }*/
       get("/db", (req, res) -> {
      Connection connection = null;
      Map<String, Object> attributes = new HashMap<>();
      try {
        connection = DatabaseUrl.extract().getConnection();

        Statement stmt = connection.createStatement();
        stmt.executeUpdate("CREATE TABLE IF NOT EXISTS ticks (tick timestamp)");
        stmt.executeUpdate("INSERT INTO ticks VALUES (now())");
        ResultSet rs = stmt.executeQuery("SELECT tick FROM ticks");

        ArrayList<String> output = new ArrayList<String>();
        while (rs.next()) {
          output.add( "Read from DB: " + rs.getTimestamp("tick"));
        }

        attributes.put("results", output);
        return new ModelAndView(attributes, "db.ftl");
      } catch (Exception e) {
        attributes.put("message", "There was an error: " + e);
        return new ModelAndView(attributes, "error.ftl");
      } finally {
        if (connection != null) try{connection.close();} catch(SQLException e){}
      }
    }, new FreeMarkerEngine());

  }

}

@@ -996,18 +996,16 @@
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-//
     get(
@@ -1034,18 +1034,16 @@
 e) -%3E %7B%0A
-//
         
@@ -1096,18 +1096,16 @@
 ap%3C%3E();%0A
-//
         
@@ -1155,13 +1155,9 @@
 %22);%0A
-//%0A//
+%0A
     
@@ -1218,14 +1218,9 @@
 %22);%0A
-//    
+%0A
     

test again