Deploy a JAR file in Cloudbees - 502 Bad Gateway - deployment

Question

I am trying to deploy the simplest application on Cloudbees, using the Spark Java framework. This produces a Jar file that I tried to deploy through the Jenkins push->deploy, but it warns me that the deploy plugin cannot deploy a jar file...
Whatever, I deployed my jar through the CloudBees SDK and the CLI :
bees app:deploy -t java -R java_version=1.7 target\myapp-with-dependencies.jar
And then it tells me that the application has been deployed to my URL. But when I try to reach this URL, I get a 502 Bad Gateway Error...
However, whether if run my main class through IntelliJ or with the Jar file produced by maven, the URL 127.0.0.1:8080 returns me the expected Hello Spark.
Here is my main class :
public class HelloSpark {
public static void main(String[] args) {
String port = System.getProperty("app.port","8080");
//So that the port is the one used by CloudBees
Spark.setPort(Integer.parseInt(port));
Spark.get(new Route("/") {
#Override
public Object handle(Request request, Response response) {
return "Hello Spark";
}
});
}
}
And here is my pom file :
<?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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>spark-from-scratch</groupId>
<artifactId>spark-from-scratch</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>spark</groupId>
<artifactId>spark</artifactId>
<version>0.9.9.4-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>HelloSpark</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

Answer 1

I think you need to specify your main class in this way:
bees app:deploy -t java -R class=your.main.Class -R java_version=1.7 PATH_TO_APP_PACKAGE

Answer 2

I think it's necessary to specify it in your command, you can read more here:
https://developer.cloudbees.com/bin/view/RUN/Java+Container