wildfly-spring-webflux-example

This project was created to be able to show how you can use Spring Webflux under Wildfly.

Changes in the standalone.xml

• add a new <filter-ref>
<filter-ref name="simplewebflux"/>
• add a new <filter>
<filter class-name="com.zhurlik.WebfluxHandler" name="simplewebflux" module="com.zhurlik" />

You should have something like this:

        <subsystem xmlns="urn:jboss:domain:undertow:4.0">    
            <buffer-cache name="default"/>    
            <server name="default-server">    
                <http-listener name="default" socket-binding="http" redirect-socket="https" enable-http2="true"/>    
                <https-listener name="https" socket-binding="https" security-realm="ApplicationRealm" enable-http2="true"/>    
                <host name="default-host" alias="localhost">    
                    <location name="/" handler="welcome-content"/>    
                    <filter-ref name="server-header"/>    
                    <filter-ref name="x-powered-by-header"/>    
                    <filter-ref name="simplewebflux"/>    
                    <http-invoker security-realm="ApplicationRealm"/>    
                </host>    
            </server>
            <servlet-container name="default">
                <jsp-config/>
                <websockets/>
            </servlet-container>
            <handlers>
                <file name="welcome-content" path="${jboss.home.dir}/welcome-content"/>
            </handlers>
            <filters>
                <filter class-name="com.zhurlik.WebfluxHandler" name="simplewebflux" module="com.zhurlik" />
                <response-header name="server-header" header-name="Server" header-value="WildFly/11"/>
                <response-header name="x-powered-by-header" header-name="X-Powered-By" header-value="Undertow/1"/>
            </filters>
        </subsystem>

Wildfly module

To be able HttpHandler we have to create our custom Wyldfly module that will use Spring Webflux. It means that at least we need to collect all required jars. Another important stuff is to use org.springframework.http.server.reactive.UndertowHttpHandlerAdapter.
This class provides as an ability to convert org.springframework.http.server.reactive.HttpHandler -> io.undertow.server.HttpHandler

I have used gradle plugin com.github.zhurlik.jbossmodules for generating the following module.xml

<?xml version='1.0' encoding='utf-8'?>
<module xmlns='urn:jboss:module:1.6' name='com.zhurlik'>
  <resources>
    <resource-root path='simple-webflux-app-0.1.jar' />
    <resource-root path='spring-webflux-5.0.2.RELEASE.jar' />
    <resource-root path='spring-core-5.0.2.RELEASE.jar' />
    <resource-root path='spring-context-5.0.2.RELEASE.jar' />
    <resource-root path='spring-beans-5.0.2.RELEASE.jar' />
    <resource-root path='spring-web-5.0.2.RELEASE.jar' />
    <resource-root path='reactor-core-3.1.2.RELEASE.jar' />
    <resource-root path='reactive-streams-1.0.1.jar' />
    <resource-root path='jackson-dataformat-smile-2.9.3.jar' />
    <resource-root path='jackson-databind-2.9.3.jar' />
    <resource-root path='jackson-core-2.9.3.jar' />
    <resource-root path='jackson-annotations-2.9.0.jar' />
  </resources>
  <dependencies>
    <module name='io.undertow.core' />
    <module name='org.slf4j' />
    <module name='org.wildfly.extension.undertow' />
    <module name='javax.api' />
    <module name='org.apache.commons.logging' />
    <module name='org.jboss.xnio' />
  </dependencies>
</module>

You can look at modules/build.gradle gradlew makeModules