Adding spring-boot2-webflux-undertow example

spring-boot2-webflux-undertow/.gitignore

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+target/
+bower_components/
+node_modules/
+dist/
+.idea/¬¬¬∑
+.tmp/
+.settings
+.metadata/
+*.iml
+*.log
+*.tmp
+*.zip
+*.bak
+dependency-reduced-pom.xml
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+.DS_Store
+
+.idea

spring-boot2-webflux-undertow/pom.xml

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+<project>
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.networknt</groupId>
+    <artifactId>spring-boot2-webflux-undertow</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.0.0.RELEASE</version>
+    </parent>
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-webflux</artifactId>
+            <exclusions>
+                <exclusion>
+                    <artifactId>spring-boot-starter-reactor-netty</artifactId>
+                    <groupId>org.springframework.boot</groupId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-undertow</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>2.0.3.RELEASE</version>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

spring-boot2-webflux-undertow/src/main/java/com/networknt/example/Example.java

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+package com.networknt.example;
+
+import org.reactivestreams.Publisher;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+import reactor.core.publisher.Mono;
+
+@Controller
+public class Example {
+
+    @GetMapping("/")
+    @ResponseBody
+    public Publisher<String> handler() {
+        return Mono.just("Hello world!");
+    }
+}

spring-boot2-webflux-undertow/src/main/java/com/networknt/example/ExampleApplication.java

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+package com.networknt.example;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.reactive.config.EnableWebFlux;
+
+@SpringBootApplication
+@EnableWebFlux
+public class ExampleApplication {
+
+    public static void main(String[] args) throws Exception {
+        SpringApplication.run(ExampleApplication.class);
+    }
+}