CAMEL-24405: Provide spring-boot-undertow-starter as the supported web server

pom.xml

@@ -103,6 +103,7 @@
 		<module>splitter-eip</module>
 		<module>widget-gadget</module>
 		<module>azure</module>
+		<module>undertow</module>
 		<module>variables</module>
 		<module>vault</module>
     </modules>

undertow/pom.xml

@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Licensed to the Apache Software Foundation (ASF) under one or more
+    contributor license agreements.  See the NOTICE file distributed with
+    this work for additional information regarding copyright ownership.
+    The ASF licenses this file to You under the Apache License, Version 2.0
+    (the "License"); you may not use this file except in compliance with
+    the License.  You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+-->
+<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>
+
+    <parent>
+        <groupId>org.apache.camel.springboot.example</groupId>
+        <artifactId>examples</artifactId>
+        <version>4.23.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>camel-example-spring-boot-undertow</artifactId>
+    <name>Camel SB Examples :: Undertow</name>
+    <description>An example showing how to use Camel with Spring Boot and Undertow as the embedded web server</description>
+
+    <properties>
+        <category>Beginner</category>
+        <undertow-spring-boot-version>1.0.0.Final-SNAPSHOT</undertow-spring-boot-version>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <!-- Camel BOM -->
+            <dependency>
+                <groupId>org.apache.camel.springboot</groupId>
+                <artifactId>camel-spring-boot-bom</artifactId>
+                <version>${camel-version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <!-- Spring Boot BOM -->
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-dependencies</artifactId>
+                <version>${spring-boot-version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+
+        <!-- Spring Boot with Undertow instead of Tomcat -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-webmvc</artifactId>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.springframework.boot</groupId>
+                    <artifactId>spring-boot-starter-tomcat</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>io.undertow</groupId>
+            <artifactId>undertow-spring-boot-starter</artifactId>
+            <version>${undertow-spring-boot-version}</version>
+        </dependency>
+
+        <!-- Camel -->
+        <dependency>
+            <groupId>org.apache.camel.springboot</groupId>
+            <artifactId>camel-spring-boot-starter</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.camel.springboot</groupId>
+            <artifactId>camel-platform-http-starter</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.camel.springboot</groupId>
+            <artifactId>camel-jackson3-starter</artifactId>
+        </dependency>
+
+        <!-- Test -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-test-spring-junit6</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>${spring-boot-version}</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

undertow/src/main/java/sample/camel/MyCamelApplication.java

@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package sample.camel;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MyCamelApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(MyCamelApplication.class, args);
+    }
+}

undertow/src/main/java/sample/camel/MyCamelRouter.java

@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package sample.camel;
+
+import org.apache.camel.builder.RouteBuilder;
+import org.apache.camel.model.rest.RestBindingMode;
+import org.springframework.stereotype.Component;
+
+@Component
+public class MyCamelRouter extends RouteBuilder {
+
+    @Override
+    public void configure() throws Exception {
+        restConfiguration()
+                .bindingMode(RestBindingMode.json);
+
+        rest("/api")
+                .get("/hello")
+                    .routeId("hello-get")
+                    .to("direct:hello");
+
+        from("direct:hello")
+                .routeId("hello")
+                .setBody(constant(java.util.Map.of("message", "Hello from Camel on Undertow!")));
+    }
+}

undertow/src/main/resources/application.properties

@@ -0,0 +1,18 @@
+## ---------------------------------------------------------------------------
+## Licensed to the Apache Software Foundation (ASF) under one or more
+## contributor license agreements.  See the NOTICE file distributed with
+## this work for additional information regarding copyright ownership.
+## The ASF licenses this file to You under the Apache License, Version 2.0
+## (the "License"); you may not use this file except in compliance with
+## the License.  You may obtain a copy of the License at
+##
+##      http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+## ---------------------------------------------------------------------------
+
+camel.main.name = MyCamelUndertow

undertow/src/test/java/sample/camel/UndertowTest.java

@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package sample.camel;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+import org.apache.camel.CamelContext;
+import org.apache.camel.test.spring.junit6.CamelSpringBootTest;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.test.web.server.LocalServerPort;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@CamelSpringBootTest
+@SpringBootTest(classes = MyCamelApplication.class, webEnvironment = WebEnvironment.RANDOM_PORT)
+public class UndertowTest {
+
+    @Autowired
+    private CamelContext camelContext;
+
+    @LocalServerPort
+    private int port;
+
+    @Test
+    public void shouldStartCamelContext() {
+        assertNotNull(camelContext);
+        assertTrue(camelContext.getStatus().isStarted());
+    }
+
+    @Test
+    public void shouldHandleGetRequest() throws Exception {
+        HttpClient client = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create("http://localhost:" + port + "/api/hello"))
+                .GET()
+                .build();
+        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+
+        assertEquals(200, response.statusCode());
+        assertTrue(response.body().contains("Hello from Camel on Undertow!"));
+    }
+}