Did my best

.circleci/config.yml.txt

@@ -0,0 +1,41 @@
+# Java Maven CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-java/ for more details
+#
+version: 2
+jobs:
+  build:
+    docker:
+      # specify the version you desire here
+      - image: circleci/openjdk:8-jdk
+
+      # Specify service dependencies here if necessary
+      # CircleCI maintains a library of pre-built images
+      # documented at https://circleci.com/docs/2.0/circleci-images/
+      # - image: circleci/postgres:9.4
+
+    working_directory: ~/repo
+
+    environment:
+      # Customize the JVM maximum heap limit
+      MAVEN_OPTS: -Xmx3200m
+
+    steps:
+      - checkout
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+          - v1-dependencies-{{ checksum "pom.xml" }}
+          # fallback to using the latest cache if no exact match is found
+          - v1-dependencies-
+
+      - run: mvn dependency:go-offline
+
+      - save_cache:
+          paths:
+            - ~/.m2
+          key: v1-dependencies-{{ checksum "pom.xml" }}
+
+      # run tests!
+      - run: mvn integration-test

pom.xml

@@ -1,18 +1,39 @@
-<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>edu.isaacVazquez.advancedjava</groupId>
-  <artifactId>isaacVazquez-app</artifactId>
-  <packaging>jar</packaging>
-  <version>1.0-SNAPSHOT</version>
-  <name>isaacVazquez-app</name>
-  <url>http://maven.apache.org</url>
-  <dependencies>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <version>3.8.1</version>
-      <scope>test</scope>
-    </dependency>
-  </dependencies>
-</project>
+<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>uml.edu.isaacVazquez</groupId>
+<artifactId>java_class</artifactId>
+<packaging>jar</packaging>
+<version>1.0</version>
+<name>1</name>
+<url>http://maven.apache.org</url>
+<properties>
+<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+</properties>
+<build>
+<pluginManagement>
+<plugins>
+<plugin><groupId>org.apache.maven.plugins</groupId>
+<artifactId>maven-compiler-plugin</artifactId>
+<version>3.1</version>
+<configuration>
+<compilerArgument>-Xlint</compilerArgument>
+<encoding>${project.build.sourceEncoding}</encoding>
+<source>1.9</source>
+<target>1.9</target>
+</configuration>
+</plugin>
+</plugins>
+</pluginManagement>
+</build>
+<dependencies>
+<dependency>
+<groupId>junit</groupId>
+<artifactId>junit</artifactId>
+<version>4.12</version>
+<scope>test</scope>
+</dependency>
+</dependencies>
+</project>

src/main/java/edu/isaacVazquez/advancedjava/Subscription.java

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+package com.company;
+
+    public class Subscription {
+        private int price ; // subscription total price in euro
+        private int length ; // length of subscription in months
+        // constructor :
+        public Subscription(int price, int length) {
+            this.price = price ;
+            this.length = length ;
+        }
+        /**
+         * Calculate the monthly subscription price in euro,
+         * rounded up to the nearest cent.
+         */
+        public double pricePerMonth() {
+            return (double) price / (double) length;
+        }
+        /**
+         * Call this to cancel/nulify this subscription.
+         */
+        public void cancel() { length = 0 ; }
+    public static void main(String[] args) {
+
+        }
+    }