Spring reactive rest service returning ServerResponse object - spring

Question

I'm having issues trying to return ServerResponse object fro a reactive rest service
#RequestMapping(path = "/", method = RequestMethod.GET)
public Mono<ServerResponse> getPages(#RequestParam(value = "siteId", required = false) String siteId,
#RequestParam(value = "parentId", required = false) String parentId) throws Exception {
Flux<MyModel> result = pageModelService.getMyModels(Id, name);
return ServerResponse.ok().body(result, MyModel.class).switchIfEmpty(ServerResponse.notFound().build());
}
I'm getting
javax.servlet.ServletException:
org.springframework.web.util.NestedServletException: Request
processing failed; nested exception is
java.lang.IllegalArgumentException: No converter found for return
value of type: class
org.springframework.web.reactive.function.server.DefaultEntityResponseBuilder$DefaultEntityResponse
here's my pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>xxxx</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>xx.xxxx</groupId>
<artifactId>xxxx-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<jetty.version>9.4.5.v20170502</jetty.version>
<spring.version>5.0.0.RC2</spring.version>
<spring-boot.version>2.0.0.M1</spring-boot.version>
<spring-cloud.version>Finchley.BUILD-SNAPSHOT</spring-cloud.version>
<servlet-api.version>3.1.0</servlet-api.version>
<lombok.version>1.16.10</lombok.version>
<pebble-spring-boot-starter.version>2.3.0</pebble-spring-boot-starter.version>
<springfox.version>2.6.1</springfox.version>
<reactor.version>3.1.0.M2</reactor.version>
<rxjava-reactive-streams.version>1.2.1</rxjava-reactive-streams.version>
<orika.version>1.5.1</orika.version>
</properties>
<dependencyManagement>
<dependencies>
<!-- Jetty BOM -->
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-bom</artifactId>
<version>${jetty.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- Spring BOM -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-framework-bom</artifactId>
<version>${spring.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- Spring Boot versions -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<artifactId>slf4j-api</artifactId>
<groupId>org.slf4j</groupId>
<version>1.7.25</version>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!-- Spring Jetty (Http Server) -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
<!-- Spring Webflux (Reactive Spring MVC) -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<!-- Spring Config (Centralized configuration) -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<!-- Spring Actuator (Management endpoints) -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- Spring Sleuth (request tracking) -->
<!-- dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-sleuth</artifactId>
</dependency-->
<!-- Spring Test -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- Spring Freemarker Template -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
<exclusions>
<exclusion>
<artifactId>spring-webmvc</artifactId>
<groupId>org.springframework</groupId>
</exclusion>
</exclusions>
</dependency>
<!-- Jetty Proxy -->
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-proxy</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-client</artifactId>
</dependency>
<!-- Lombok (IDE tool) -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>${springfox.version}</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>${springfox.version}</version>
</dependency>
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-core</artifactId>
<version>${reactor.version}</version>
</dependency>
<dependency>
<groupId>io.reactivex</groupId>
<artifactId>rxjava-reactive-streams</artifactId>
<version>${rxjava-reactive-streams.version}</version>
</dependency>
<dependency>
<groupId>ma.glasnost.orika</groupId>
<artifactId>orika-core</artifactId>
<version>${orika.version}</version>
</dependency>
</dependencies>
<repositories>
<!-- Spring Snapshot -->
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<!-- Spring Milestones -->
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<!-- Spring Snapshot -->
<pluginRepository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
<!-- Spring Milestones -->
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.3.2</version>
<executions>
<!-- Required: The following will ensure `npm install` is called
before anything else during the 'Default Lifecycle' -->
<execution>
<id>npm install (initialize)</id>
<goals>
<goal>exec</goal>
</goals>
<phase>initialize</phase>
<configuration>
<executable>npm</executable>
<workingDirectory>src/main/resources/angular</workingDirectory>
<arguments>
<argument>install</argument>
</arguments>
</configuration>
</execution>
<execution>
<id>npm build</id>
<goals>
<goal>exec</goal>
</goals>
<phase>initialize</phase>
<configuration>
<executable>ng</executable>
<workingDirectory>src/main/resources/angular</workingDirectory>
<arguments>
<argument>build</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
<resources>
<resource>
<filtering>true</filtering>
<directory>src/main/config</directory>
</resource>
<resource>
<filtering>false</filtering>
<directory>src/main/resources</directory>
<includes>
<include>static/**</include>
</includes>
</resource>
<resource>
<filtering>true</filtering>
<directory>src/main/resources</directory>
<excludes>
<exclude>**/*.src.less</exclude>
<exclude>**/*.src.js</exclude>
<exclude>static/**</exclude>
<exclude>angular/**</exclude>
</excludes>
</resource>
</resources>
</build>
</project>
I tried to add jackson dependencies, but seems it's another issue
any idea would be welcome

Answer 1

From this answer:
ServerResponse is meant to be used with WebFlux Handlers and not with RestControllers.

Answer 2

By default, spring-boot-starter-webflux will use Reactor Netty as webflux runtime.
If you want to use Jetty as target runtime, just exclude spring-boot-starter-reactory-netty in spring-boot-starter-webflux dependency and add spring-boot-starter-jetty explicitly.
Then simply declares Spring boot as parent POM.
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.M3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
Clean other unuse dependencies, remove your dependencyManagement.
Check my working sample(but I am using the default Reactor Netty as runtime):
Vanllia version: https://github.com/hantsy/spring-reactive-sample/tree/master/vanilla
Spring Boot version: https://github.com/hantsy/spring-reactive-sample/tree/master/boot