The MIT License (MIT)

Copyright (c) 2014 Joe Kutner

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

web: java $JAVA_OPTS -cp target/classes:target/dependency/* Main

heroku-java-sample

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>com.example</groupId>

<version>1.0-SNAPSHOT</version>

<artifactId>helloworld</artifactId>

<dependencies>

<dependency>

<groupId>org.eclipse.jetty</groupId>

<artifactId>jetty-servlet</artifactId>

<version>7.6.0.v20120127</version>

</dependency>

<dependency>

<groupId>javax.servlet</groupId>

<artifactId>servlet-api</artifactId>

<version>2.5</version>

</dependency>

<dependency>

<groupId>postgresql</groupId>

<artifactId>postgresql</artifactId>

<version>9.0-801.jdbc4</version>

</dependency>

</dependencies>

<build>

<plugins>

<plugin>

<artifactId>maven-compiler-plugin</artifactId>

<version>2.3.2</version>

<configuration>

<source>1.7</source>

<target>1.7</target>

</configuration>

</plugin>

<plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-dependency-plugin</artifactId>

<version>2.4</version>

<executions>

<execution>

<id>copy-dependencies</id>

<phase>package</phase>

<goals><goal>copy-dependencies</goal></goals>

</execution>

</executions>

</plugin>

</plugins>

</build>

</project>

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.*;

import org.eclipse.jetty.server.Server;

import org.eclipse.jetty.servlet.*;

import java.net.URI;

import java.net.URISyntaxException;

import java.sql.*;

public class Main extends HttpServlet {

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

if (req.getRequestURI().endsWith("/db")) {

showDatabase(req,resp);

} else {

showHome(req,resp);

}

}

private void showHome(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

resp.getWriter().print("Hello from Java!");

}

private void showDatabase(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

try {

Connection connection = 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");

String out = "Hello!\n";

while (rs.next()) {

out += "Read from DB: " + rs.getTimestamp("tick") + "\n";

}

resp.getWriter().print(out);

} catch (Exception e) {

resp.getWriter().print("There was an error: " + e.getMessage());

}

}

private Connection getConnection() throws URISyntaxException, SQLException {

URI dbUri = new URI(System.getenv("DATABASE_URL"));

String username = dbUri.getUserInfo().split(":")[0];

String password = dbUri.getUserInfo().split(":")[1];

String dbUrl = "jdbc:postgresql://" + dbUri.getHost() + dbUri.getPath();

return DriverManager.getConnection(dbUrl, username, password);

}

public static void main(String[] args) throws Exception{

Server server = new Server(Integer.valueOf(System.getenv("PORT")));

ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);

context.setContextPath("/");

server.setHandler(context);

context.addServlet(new ServletHolder(new Main()),"/*");

server.start();

server.join();

}

}

java.runtime.version=1.7