diff --git a/Code/ost/_00_hello_world/src/main/java/com/example/App.java b/Code/ost/_00_hello_world/src/main/java/com/example/App.java
index d2930cc..dbf87b2 100644
--- a/Code/ost/_00_hello_world/src/main/java/com/example/App.java
+++ b/Code/ost/_00_hello_world/src/main/java/com/example/App.java
@@ -10,7 +10,8 @@ import javafx.stage.Stage;
  * JavaFX App
  */
 public class App extends Application {
-
+    // Method start is already defined int the library Application so we have to
+    // Override it
     @Override
     
     public void start(Stage stage) {
diff --git a/Code/ost/_00_hello_world/target/classes/com/example/App.class b/Code/ost/_00_hello_world/target/classes/com/example/App.class
index 247092f..65da249 100644
Binary files a/Code/ost/_00_hello_world/target/classes/com/example/App.class and b/Code/ost/_00_hello_world/target/classes/com/example/App.class differ
diff --git a/Code/ost/_01_hello_world/pom.xml b/Code/ost/_01_hello_world/pom.xml
new file mode 100644
index 0000000..1ca6d84
--- /dev/null
+++ b/Code/ost/_01_hello_world/pom.xml
@@ -0,0 +1,46 @@
+<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>
+    <artifactId>_01_hello_world</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.openjfx</groupId>
+            <artifactId>javafx-controls</artifactId>
+            <version>13</version>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.0</version>
+                <configuration>
+                    <release>11</release>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.openjfx</groupId>
+                <artifactId>javafx-maven-plugin</artifactId>
+                <version>0.0.6</version>
+                <executions>
+                    <execution>
+                        <!-- Default configuration for running -->
+                        <!-- Usage: mvn clean javafx:run -->
+                        <id>default-cli</id>
+                        <configuration>
+                            <mainClass>com.example.App</mainClass>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/Code/ost/_01_hello_world/src/main/java/com/example/App.java b/Code/ost/_01_hello_world/src/main/java/com/example/App.java
new file mode 100644
index 0000000..f7f7cfc
--- /dev/null
+++ b/Code/ost/_01_hello_world/src/main/java/com/example/App.java
@@ -0,0 +1,30 @@
+package com.example;
+
+import javafx.application.Application;
+import javafx.scene.Scene;
+import javafx.scene.control.Label;
+import javafx.scene.layout.StackPane;
+import javafx.stage.Stage;
+
+
+/**
+ * JavaFX App
+ */
+public class App extends Application {
+
+    @Override
+    public void start(Stage stage) {
+        var javaVersion = SystemInfo.javaVersion();
+        var javafxVersion = SystemInfo.javafxVersion();
+
+        var label = new Label("Hello, JavaFX " + javafxVersion + ", running on Java " + javaVersion + ".");
+        var scene = new Scene(new StackPane(label), 640, 480);
+        stage.setScene(scene);
+        stage.show();
+    }
+
+    public static void main(String[] args) {
+        launch();
+    }
+
+}
\ No newline at end of file
diff --git a/Code/ost/_01_hello_world/src/main/java/com/example/SystemInfo.java b/Code/ost/_01_hello_world/src/main/java/com/example/SystemInfo.java
new file mode 100644
index 0000000..b566a3e
--- /dev/null
+++ b/Code/ost/_01_hello_world/src/main/java/com/example/SystemInfo.java
@@ -0,0 +1,13 @@
+package com.example;
+
+public class SystemInfo {
+
+    public static String javaVersion() {
+        return System.getProperty("java.version");
+    }
+
+    public static String javafxVersion() {
+        return System.getProperty("javafx.version");
+    }
+
+}
\ No newline at end of file
diff --git a/Code/ost/_01_hello_world/src/main/java/module-info.java b/Code/ost/_01_hello_world/src/main/java/module-info.java
new file mode 100644
index 0000000..5918012
--- /dev/null
+++ b/Code/ost/_01_hello_world/src/main/java/module-info.java
@@ -0,0 +1,4 @@
+module com.example {
+    requires javafx.controls;
+    exports com.example;
+}
diff --git a/Code/ost/_01_hello_world/target/classes/com/example/App.class b/Code/ost/_01_hello_world/target/classes/com/example/App.class
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diff --git a/Code/ost/_01_hello_world/target/classes/com/example/SystemInfo.class b/Code/ost/_01_hello_world/target/classes/com/example/SystemInfo.class
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index 0000000..487f8e1
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diff --git a/Code/ost/_01_hello_world/target/classes/module-info.class b/Code/ost/_01_hello_world/target/classes/module-info.class
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index 0000000..5e9b472
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