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websocket-hello: A simple WebSocket application

The websocket-hello quickstart demonstrates how to create a simple WebSocket application.

What is it?

The websocket-hello quickstart demonstrates how to create a simple WebSocket-enabled application in Red Hat JBoss Enterprise Application Platform. It consists of the following:

  • A JavaScript enabled WebSocket HTML client.

  • A WebSocket server endpoint that uses annotations to interact with the WebSocket events.

  • A jboss-web.xml file configured to enable WebSockets

WebSockets are a requirement of the Jakarta EE 10 specification and are implemented in JBoss EAP 8.0. They are configured in the undertow subsystem of the server configuration file. This quickstart uses the WebSocket default settings, so it is not necessary to modify the server configuration to deploy and run this quickstart.

Note
 This quickstart demonstrates only a few of the basic functions. A fully functional application should provide better error handling and intercept and handle additional events.

System Requirements

The application this project produces is designed to be run on Red Hat JBoss Enterprise Application Platform 8.0 or later.

All you need to build this project is Java 11.0 (Java SDK 11) or later and Maven 3.6.0 or later. See Configure Maven to Build and Deploy the Quickstarts to make sure you are configured correctly for testing the quickstarts.

Use of the EAP_HOME and QUICKSTART_HOME Variables

In the following instructions, replace EAP_HOME with the actual path to your JBoss EAP installation. The installation path is described in detail here: Use of EAP_HOME and JBOSS_HOME Variables.

When you see the replaceable variable QUICKSTART_HOME, replace it with the path to the root directory of all of the quickstarts.

Building and running the quickstart application with a JBoss EAP server distribution

Start the JBoss EAP Standalone Server

  1. Open a terminal and navigate to the root of the JBoss EAP directory.

  2. Start the JBoss EAP server with the default profile by typing the following command.

    $ EAP_HOME/bin/standalone.sh
    Note
    		 For Windows, use the EAP_HOME\bin\standalone.bat script.

Build and Deploy the Quickstart

  1. Make sure you start the JBoss EAP server as described above.

  2. Open a terminal and navigate to the root directory of this quickstart.

  3. Type the following command to build the quickstart.

    $ mvn clean package

  4. Type the following command to deploy the quickstart.

    $ mvn wildfly:deploy

This deploys the websocket-hello/target/websocket-hello.war to the running instance of the server.

You should see a message in the server log indicating that the archive deployed successfully.

Access the Application

The application will be running at the following URL: http://localhost:8080/websocket-hello/.

  1. Click on the Open Connection button to create the WebSocket connection and display current status of Open.

  2. Type a name and click Say Hello to create and send the Say hello to NAME message. The message appears in the server log and a response is sent to the client.

  3. Click on the Close Connection button to close the WebSocket connection and display the current status of Closed.

  4. If you attempt to send another message after closing the connection, the following message appears on the page:

    WebSocket connection is not established. Please click the Open Connection button.

Run the Arquillian Integration Tests

This quickstart includes Arquillian integration tests. They are located under the src/test/ directory. The integration tests verify that the quickstart runs correctly when deployed on the server.

Follow these steps to run the integration tests.

  1. Make sure you start the JBoss EAP server, as previously described.

  2. Make sure you build and deploy the quickstart, as previously described.

  3. Type the following command to run the verify goal with the arq-remote profile activated.

    $ mvn verify -Parq-remote
Note

You may also use the environment variable SERVER_HOST or the system property server.host to define the target host of the tests.

Undeploy the Quickstart

When you are finished testing the quickstart, follow these steps to undeploy the archive.

  1. Make sure you start the JBoss EAP server as described above.

  2. Open a terminal and navigate to the root directory of this quickstart.

  3. Type this command to undeploy the archive:

    $ mvn wildfly:undeploy

Building and running the quickstart application with OpenShift

Build the JBoss EAP Source-to-Image (S2I) Quickstart to OpenShift with Helm Charts

On OpenShift, the S2I build with Apache Maven will use an openshift profile used to provision a JBoss EAP server to deploy and run the quickstart in OpenShift environment. You can activate the Maven profile named openshift when building the quickstart:

$ mvn clean package -Popenshift

The provisioned JBoss EAP server for OpenShift, with the quickstart deployed, can then be found in the target/server directory, and its usage is similar to a standard server distribution. You may note that it uses the cloud feature pack which enables a configuration tuned for OpenShift environment.

The server provisioning functionality is provided by the EAP Maven Plugin, and you may find its configuration in the quickstart pom.xml:

        <profile>
            <id>openshift</id>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.jboss.eap.plugins</groupId>
                        <artifactId>eap-maven-plugin</artifactId>
                        <version>${version.eap.maven.plugin}</version>
                        <configuration>
                            <feature-packs>
                                <feature-pack>
                                    <location>org.jboss.eap:wildfly-ee-galleon-pack</location>
                                </feature-pack>
                                <feature-pack>
                                    <location>org.jboss.eap.cloud:eap-cloud-galleon-pack</location>
                                </feature-pack>
                            </feature-packs>
                            <layers>
                                <layer>cloud-server</layer>
                            </layers>
                            <filename>ROOT.war</filename>
                        </configuration>
                        <executions>
                            <execution>
                                <goals>
                                    <goal>package</goal>
                                </goals>
                            </execution>
                        </executions>
                    </plugin>
                </plugins>
            </build>
        </profile>
Note

Since the plugin configuration above deploys quickstart on root web context of the provisioned server, the URL to access the application should not have the /websocket-hello path segment after HOST:PORT.

Getting Started with JBoss EAP for OpenShift and Helm Charts

This section contains the basic instructions to build and deploy this quickstart to JBoss EAP for OpenShift or JBoss EAP for OpenShift Online using Helm Charts.

Prerequisites

  • You must be logged in OpenShift and have an oc client to connect to OpenShift

  • Helm must be installed to deploy the backend on OpenShift.

Once you have installed Helm, you need to add the repository that provides Helm Charts for JBoss EAP.

$ helm repo add jboss-eap https://jbossas.github.io/eap-charts/
"jboss-eap" has been added to your repositories
$ helm search repo jboss-eap
NAME                    CHART VERSION   APP VERSION     DESCRIPTION
jboss-eap/eap8         ...             ...             A Helm chart to build and deploy EAP 8.0 applications

Deploy the JBoss EAP Source-to-Image (S2I) Quickstart to OpenShift with Helm Charts

Log in to your OpenShift instance using the oc login command. The backend will be built and deployed on OpenShift with a Helm Chart for JBoss EAP.

Navigate to the root directory of this quickstart and run the following command:

$ helm install websocket-hello -f charts/helm.yaml jboss-eap/eap8
NAME: websocket-hello
...
STATUS: deployed
REVISION: 1

The Helm Chart for this quickstart contains all the information to build an image from the source code using S2I on Java 17:

build:
  uri: https://github.com/jboss-developer/jboss-eap-quickstarts.git
  ref: 8.0.x
  contextDir: websocket-hello
deploy:
  replicas: 1

This will create a new deployment on OpenShift and deploy the application.

If you want to see all the configuration elements to customize your deployment you can use the following command:

$ helm show readme jboss-eap/eap8

Let’s wait for the application to be built and deployed:

$ oc get deployment websocket-hello -w
NAME         DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
websocket-hello   1         1         1            0           12s
...
websocket-hello   1         1         1            1           2m

Get the URL of the route to the deployment.

$ oc get route websocket-hello -o jsonpath="{.spec.host}"

Access the application in your web browser using the displayed URL.

Note

The Maven profile named openshift is used by the Helm chart to provision the server with the quickstart deployed on the root web context, and thus the application should be accessed with the URL without the /websocket-hello path segment after HOST:PORT.

Undeploy the JBoss EAP Source-to-Image (S2I) Quickstart from OpenShift with Helm Charts

$ helm uninstall websocket-hello

Run the Arquillian Integration Tests with OpenShift

This quickstart includes Arquillian integration tests. They are located under the src/test/ directory. The integration tests verify that the quickstart runs correctly when deployed on the server.

Note

The Arquillian integration tests expect a deployed application, so make sure you have deployed the quickstart on OpenShift before you begin.

Run the integration tests using the following command to run the verify goal with the arq-remote profile activated and the proper URL:

$ mvn clean verify -Parq-remote -Dserver.host=https://$(oc get route websocket-hello --template='{{ .spec.host }}')
Note

The tests are using SSL to connect to the quickstart running on OpenShift. So you need the certificates to be trusted by the machine the tests are run from.