Add WelcomePageServlet

see joinfaces/joinfaces-gradle-jar-example#101

src/main/java/org/joinfaces/example/WarExampleApplication.java

@@ -2,12 +2,14 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.web.servlet.ServletComponentScan;
 import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
 
 /**
  * @author Lars Grefer
  */
 @SpringBootApplication
+@ServletComponentScan
 public class WarExampleApplication extends SpringBootServletInitializer {
 
     public static void main(String[] args) {

src/main/java/org/joinfaces/example/WelcomePageServlet.java

@@ -0,0 +1,23 @@
+package org.joinfaces.example;
+
+import jakarta.servlet.GenericServlet;
+import jakarta.servlet.ServletRequest;
+import jakarta.servlet.ServletResponse;
+import jakarta.servlet.annotation.WebServlet;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+
+/**
+ * @author Lars Grefer
+ */
+@WebServlet(urlPatterns = "/")
+public class WelcomePageServlet extends GenericServlet {
+
+    @Override
+    public void service(ServletRequest req, ServletResponse res) throws IOException {
+        if (res instanceof HttpServletResponse httpServletResponse) {
+            httpServletResponse.sendRedirect("/index.xhtml");
+        }
+    }
+}

src/test/java/org/joinfaces/example/WarExampleApplicationTest.java

@@ -24,6 +24,17 @@ public class WarExampleApplicationTest {
     public void testHelloFromSpring() {
         ResponseEntity<String> entity = restTemplate.getForEntity("/index.xhtml", String.class);
 
+        checkResponse(entity);
+    }
+
+    @Test
+    public void testWelcomePageRedirect() {
+        ResponseEntity<String> entity = restTemplate.getForEntity("/", String.class);
+
+        checkResponse(entity);
+    }
+
+    private static void checkResponse(ResponseEntity<String> entity) {
         assertThat(entity.getStatusCode().is2xxSuccessful()).isTrue();
 
         assertThat(entity.getBody()).contains("Hello from Spring:");