java dockerfile

pom.xml

@@ -16,6 +16,7 @@
     </parent>
 
     <dependencies>
+        <!-- Spring Boot Web -->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
@@ -23,10 +24,19 @@
     </dependencies>
 
     <build>
+        <!-- Look for Java files in root folder -->
+        <sourceDirectory>${basedir}</sourceDirectory>
+
         <plugins>
+            <!-- Spring Boot Maven Plugin -->
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>3.2.5</version>
+                <configuration>
+                    <!-- Specify main class -->
+                    <mainClass>DemoApplication</mainClass>
+                </configuration>
             </plugin>
         </plugins>
     </build>