Java SpringBoot running Scala component

pom.xml

     <build>
         <plugins>
             <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <source>18</source>
+                    <target>18</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.2.4</version>
+                <configuration>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
                 <groupId>net.alchim31.maven</groupId>
                 <artifactId>scala-maven-plugin</artifactId>
                 <version>3.1.3</version>
             <groupId>com.typesafe.akka</groupId>
             <artifactId>akka-stream_${scala.binary.version}</artifactId>
         </dependency>
+
+        <!-- alpakka -->
+        <dependency>
+            <groupId>com.lightbend.akka</groupId>
+            <artifactId>akka-stream-alpakka-file_2.13</artifactId>
+            <version>4.0.0</version>
+        </dependency>
+
         <!-- SpringBoot -->
         <dependency>
             <groupId>org.springframework.boot</groupId>

src/main/java/com/mediahub/MediahubApplication.java

+package com.mediahub;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MediahubApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(MediahubApplication.class, args);
+    }
+
+}

src/main/scala/com/mediahub/HelloWorld.scala

+package com.mediahub
+
+import org.springframework.stereotype.Component
+
+@Component
+class HelloWorld {
+  println("Hello from default constructor")
+  greet()
+
+
+
+  def greet() = {
+    val greeting = "Hello from SCALA!!!!"
+    println(greeting)
+  }
+
+}

src/main/scala/com/mediahub/SpringBootIntegration.scala

-package com.mediahub
-
-import org.springframework.boot.{CommandLineRunner, SpringApplication}
-import org.springframework.boot.autoconfigure.SpringBootApplication
-
-@SpringBootApplication
-class SpringBootIntegration extends CommandLineRunner{
-  override def run(args: String*): Unit = println("\n\n\n *** Hello World \n\n\n")
-}
-
-object SpringBootIntegration extends App {
-  SpringApplication.run(classOf[SpringBootIntegration])
-}