Dueuno Elements #1 — First application in 3 steps

DISCLAIMER: DUEUNO ELEMENTS IS NOT THE PERFECT SOFTWARE YOU DREAM. THE WORLD IS NOT THE PERFECT EXPERIENCE YOU DREAM. IT’S NOT MY FAULT, IT’S NOT YOUR FAULT AND IT WORKED PRETTY WELL FOR CENTURIES SO I GUESS WE CAN TAKE A DEEP BREATH AND KEEP WALKING.

I love Philosophy. I could write thousands of words about Dueuno Elements but there’s another thing I love: Practice.

So let’s write our first Dueuno Elements application, shall we?

ATTENTION PLEASE: If you are a seasoned developer or you’re in a hurry, install Java 17, go download the Dueuno Elements Template Application, run it with ./gradlew bootRun and these are your three steps.

STEP 1 — Forge a new Grails application

Dueuno Elements is built on top of Java 17 and the beautiful Apache Groovy & Grails Framework. The Grails website gives us what we need to quickly start up with a “blank” application project.

1. Download and install Java 17
2. Go here: https://start.grails.org
3. Select “Java 17” — SELECT JAVA 17 (We only support Java 17. I know, life is not fair)
4. Click “Generate Project”
5. Download the “demo.zip” file and uncompress it on your home folder

STEP 2 — Add the Dueuno Elements dependency

Edit ~/demo/build.gradle

Find the dependencies section and add the following line:

...

dependencies {
    ...

    implementation 'org.dueuno:elements-core:2.1.1'
}

Edit ~/demo/grails-app/init/BootStrap.groovy and copy the following code:

package com.example

import dueuno.elements.core.ApplicationService

class BootStrap {

    ApplicationService applicationService

    def init = { servletContext ->
        applicationService.init {
            // It's fine to leave this empty at the moment
        }
    }

    def destroy = {
    }
}

Delete ~/demo/grails-app/controllers/UrlMappings.groovy

STEP 3 — Run the application

Execute ./gradlew bootRun

Open the displayed URL: http://localhost:8080

ATTENTION PLEASE: The first time you run the application a lot of dependencies will be downloaded so go get something to drink or play Tetris. I love playing Tetris.

With a bit of luck, at this point you should be able to see something on the screen. You can login with the following username/password:

• super/super
  This is the Superuser, it has full power on the system. You can create new tenants, configure the system properties and monitor the whole application.
• admin/admin
  This is the DEFAULT Tenant Administrator. It can configure the tenant properties, manage groups, users and watch audit logs.

We can now play around with the basics of a Dueuno Elements application. When done, we can terminate the application pressing CTRL + C.

Conclusions

If you’ve reached this point and you successfully run the application you should subscribe and stay tuned.

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