Pular para o conteúdo principal

Wildfly 10 Javascript Hello World in 2 minutes

We already talked about Nashorn, JavaFX and Javascript in this blog, but today I was surprised by the announcement that Widlfly 10 supports Javascript in the server side. I should have seen before, but only after a few months it was released I saw it on twitter!

After seeing the announcements samples, I thought I had to try it and surprisingly it took less than a few minutes to have my first script running. Here are the steps I had to follow:

(I am considering you already have Java 8 installed)

  • * Download Widlfly 10: I downloaded Widlfly 10.0.0.CR4 Application Server Distribution. See more in widlfly downloads page;
$ wget http://download.jboss.org/wildfly/10.0.0.CR4/wildfly-10.0.0.CR4.zip

  • Unzip it somewhere locally: 
$ unzip wildfly-10.0.0.CR4.zip

  • Start it "quietly":
$ cd wildfly-10.0.0.CR4
& ./bin/standalone.sh > /dev/null &

  • Create the application structure in the deployments directory
$ mkdir -p standalone/deployments/app.war/WEB-INF

  • Create the only descriptor needed in your application and declare the Javascript file on it (hello.js):
$ cat standalone/deployments/app.war/WEB-INF/undertow-scripts.conf 
hello.js

  • Create the javascript file itself in the application root directory:
$ cat standalone/deployments/app.war/hello.js 
$undertow.onGet("/say-hello", function($exchange) {
return "Hello World!";
});

As you can see above, when you send a HTTP request using the GET method to the URL {host}/{app context}/say-hello it should return "Hello World!". We just have to provide the context and the function that will handle the requests.
  • Deploy the application itself:
$ touch standalone/deployments/app.war.dodeploy

  • Check if it was correctly deployed by checking the logs:
$ tail  -n 3 standalone/log/server.log 
2015-11-15 21:47:09,649 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-3) WFLYSRV0027: Starting deployment of "app.war" (runtime-name: "app.war")
2015-11-15 21:47:11,600 INFO  [org.wildfly.extension.undertow] (ServerService Thread Pool -- 63) WFLYUT0021: Registered web context: /app
2015-11-15 21:47:11,654 INFO  [org.jboss.as.server] (DeploymentScanner-threads - 2) WFLYSRV0010: Deployed "app.war" (runtime-name : "app.war")

  • Finally test the application using a web browser or curl:
$ curl http://localhost:8080/app/say-hello
Hello World!


Well, that's just the beginning. You can now using Java EE services in your javascript annotation as it is described in the release announcement. 

I guess you still did not notice the best part: you don't need to recompile your application anymore, you can simply edit the javascript and touch the app.war.dodeploy file and the changes will be immediately available (after, of course, a redeploy). Stuart Douglas pointed that you can configure hot deployment and no redeploy is needed. The hot deployment configuration is described in the announcement as well and to configure it I simply created the file undertow-external-mounts.conf with the directory where my javascripts are located:


$ echo /opt/jboss/WILDFLY/wildfly-10.0.0.CR4/standalone/deployments/app.war/  > standalone/deployments/app.war/WEB-INF/undertow-external-mounts.conf

 Now if I edit any javascript file in the pointed directory I will see the changes immediately once I reach the endpoint.

If you still do not believe it is really simple, I have created a video for you!




Marcadores:

Comentários

Postar um comentário

Postagens mais visitadas deste blog

Creating custom Work Item Handler in BPM Suite/jBPM 6

Hi all! In this post I am going to share my experience creating a work item handler for BPM Suite 6.0.3 (which is very similar to jbpm as explained in a previous post ). The Hello World Work Item Handler Let's create a really simple WorkItemHandler just to print "Hello World" in the console. Of course you can implement more feature and make it receive parameters, access database, web services, etc. But in this post we will keep it simple. Really simple. First thing to do is to create a maven project for my WorkItemHandler. Here's the pom.xml of my Maven project: Notice that we are importing jbpm dependency so we can find the java interface that is used to create work item handlers. Now we can start coding. Let's create a class name HelloWorkItemHandler in package org.jugvale.jbpm, here is the simple code: Now we can build our project and go to BPM Suite to configure it so we can use this workitem. Registering the WorkItemHandler UPDATE...
17 comentários
Leia mais

Using the REST Task from jBPM 6

In this post I am going to share my experience using the BPM Suite 6 REST Task. BPM Suite  X jBPM jBPM is a JBoss community project to offer an open source and efficient BPM Suite and BPM Suite is a product created by Red Hat based on jBPM. In this post I will be using BPM Suite because I have it installed already, but what I am going to described should work for jBPM as well.   REST Task  The REST Task is used to invoke a REST resource (or perform an HTTP Request) from your Business Process. You can set the URL, HTTP Method, timeout and credentials from the Process Modeller interface and when the process gets into that task, it will generate a HTTP Request and return the response as String. It is available on the left side pallet under the "Service Tasks" tab: The Target REST Web Service The service we are going to access from our process is a really simple one, that's why it is called simple-hello-rs and it is based on JBoss helloworld-rs qu...
10 comentários
Leia mais

Simplest JavaFX ComboBox autocomplete

Based on this Brazilian community post , I've created a sample Combobox auto complete. What it basically does is: When user type with the combobox selected, it will work on a temporary string to store the typed text; Each key typed leads to the combobox to be showed and updated If backspace is type, we update the filter Each key typed shows the combo box items, when the combobox is hidden, the filter is cleaned and the tooltip is hidden:   The class code and a sample application is below. I also added the source to my personal github , sent me PR to improve it and there are a lot of things to improve, like space and accents support.
2 comentários
Leia mais