Heroku

Get Your Heroku Ready

Refer to Getting Started with Heroku for getting Heroku ready. You should have Ruby, Git, and Heroku Gem installed and have applied for a Heroku account.

Deploy ZK Project to Heroku

Heroku only allow Maven Projects. Follow this guide to create a ZK-Maven Project. After you have created a ZK-Maven project, you can decide to run with either Jetty or Tomcat.

ZK Maven Project With Jetty Server Embedded

1. Modify pom.xml to add embedded Jetty web container for running on Heroku.

<plugin>
	<groupId>org.apache.maven.plugins</groupId>
	<artifactId>maven-dependency-plugin</artifactId>
	<version>2.3</version>
	<executions>
		<execution>
			<phase>package</phase>
			<goals>
				<goal>copy</goal>
			</goals>
			<configuration>
				<artifactItems>
					<artifactItem>
						<groupId>org.mortbay.jetty</groupId>
						<artifactId>jetty-runner</artifactId>
						<version>7.5.4.v20111024</version>
						<destFileName>jetty-runner.jar</destFileName>
					</artifactItem>
				</artifactItems>
			</configuration>
		</execution>
	</executions>
</plugin>

2. Create a file named Procfile in Project root to tell Heroku how to execute the application

web: java $JAVA_OPTS -jar target/dependency/jetty-runner.jar --port $PORT target/*.war

ZK Maven Project With Tomcat Server Embedded

1. Create Main.java in src/main/java with package launch to start embedded Tomcat server.

package launch;

import java.io.File;
import org.apache.catalina.startup.Tomcat;

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

		String webappDirLocation = "src/main/webapp/";
		Tomcat tomcat = new Tomcat();

		// The port that we should run on can be set into an environment variable
		// Look for that variable and default to 8080 if it isn't there.
		String webPort = System.getenv("PORT");
		if (webPort == null || webPort.isEmpty()) {
			webPort = "8080";
		}

		tomcat.setPort(Integer.valueOf(webPort).intValue());

		tomcat.addWebapp("/", new File(webappDirLocation).getAbsolutePath());
		System.out.println("configuring app with basedir: " + new File("./" + webappDirLocation).getAbsolutePath());

		tomcat.start();
		tomcat.getServer().await();
	}
}

2. Modify pom.xml.

a) Remove <package>war</package> line to make Main.class work

b) Add embedded Tomcat web container for running on Heroku.

<!-- <packaging>war</packaging> -->
...
<dependency>
	<groupId>org.apache.tomcat.embed</groupId>
	<artifactId>tomcat-embed-core</artifactId>
	<version>7.0.22</version>
</dependency>
<dependency>
	<groupId>org.apache.tomcat.embed</groupId>
	<artifactId>tomcat-embed-logging-juli</artifactId>
	<version>7.0.22</version>
</dependency>
<dependency>
	<groupId>org.apache.tomcat.embed</groupId>
	<artifactId>tomcat-embed-jasper</artifactId>
	<version>7.0.22</version>
</dependency>
<!-- The following three dependencies are used for JSP. If you application doesn't contain JSP, simply remove them -->
<dependency>
	<groupId>org.apache.tomcat</groupId>
	<artifactId>tomcat-jasper</artifactId>
	<version>7.0.22</version>
</dependency>
<dependency>
	<groupId>org.apache.tomcat</groupId>
	<artifactId>tomcat-jasper-el</artifactId>
	<version>7.0.22</version>
</dependency>
<dependency>
	<groupId>org.apache.tomcat</groupId>
	<artifactId>tomcat-jsp-api</artifactId>
	<version>7.0.22</version>
</dependency>
...
<!-- Add the plugin to start ''Main.class'' -->
<plugin>
	<groupId>org.codehaus.mojo</groupId>
	<artifactId>appassembler-maven-plugin</artifactId>
	<version>1.1.1</version>
	<configuration>
		<assembleDirectory>target</assembleDirectory>
		<programs>
			<program>
				<mainClass>launch.Main</mainClass>
				<name>webapp</name>
			</program>
		</programs>
	</configuration>
	<executions>
		<execution>
			<phase>package</phase>
			<goals>
				<goal>assemble</goal>
			</goals>
		</execution>
	</executions>
</plugin>
...

3. Create a file named Procfile in Project root to tell Heroku how to execute the application

web: sh target/bin/webapp

Deploy to Heroku

Once the server is ready, we can deploy to Heroku.

1. Initialize git repository.

cd projectName
git init

2. Create a .gitignore file to ignore all the files under target folder as these files are unnecessary to be managed and included by git repository.

target

3. Commit project source code to git repository.

git add .
git commit -m "CommitMessageNote"

4. Create Heroku app on Cedar stack and Heroku will create an app with a random AppName that can be changed later:

heroku create --stack cedar

5. Deploy the code

git push heroku master

6. Rename the AppName (Optional)

heroku rename newname

7. Visit the application

heroku open

Update Source Code changes to Heroku

If you wish to make changes to the app deployed on Heroku, follow the steps below:

1. Commit project source code to git repository.

git add .
git commit -m "CommitMessageNote"

2. Deploy the code

git push heroku master

3. Visit the changes

heroku open

Sample

• Download the sample maven project named heroku_zksandbox.zip.
• Sandbox sample is deployed on Heroku at http://zksandbox.herokuapp.com/.