Upgrade to Java 17 and Spring Boot 3

externalwar/pom.xml

@@ -14,14 +14,16 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.3.RELEASE</version>
+		<version>3.1.3</version>
 		<relativePath />
 	</parent>
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-		<java.version>1.8</java.version>
+		<java.version>17</java.version>
+		<maven.compiler.source>17</maven.compiler.source>
+		<maven.compiler.target>17</maven.compiler.target>
 	</properties>
 
 	<developers>
@@ -39,13 +41,11 @@
 			<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
 
-		<!-- Dependecy to convert to tomcat WAR -->
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-tomcat</artifactId>
 			<scope>provided</scope>
 		</dependency>
-
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>

externalwar/src/main/java/site/sample/externalwar/ExternalwarApplication.java

@@ -10,14 +10,9 @@
  * @author Miguel Caceres This Spring Boot application runs on Tomcat
  */
 @SpringBootApplication
-public class ExternalwarApplication extends SpringBootServletInitializer {
+public class ExternalwarApplication {
 
 	public static void main(String[] args) {
 		SpringApplication.run(ExternalwarApplication.class, args);
 	}
-
-	@Override
-	protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
-		return super.configure(builder);
-	}
 }

externalwar/src/main/java/site/sample/externalwar/ServletInitializer.java

@@ -0,0 +1,14 @@
+package site.sample.externalwar;
+
+
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
+
+public class ServletInitializer extends SpringBootServletInitializer {
+
+    @Override
+    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
+        return application.sources(ExternalwarApplication.class);
+    }
+
+}

externalwar/src/main/resources/application.properties

@@ -0,0 +1 @@
+server.port=8080