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https://github.com/mvysny/vaadin-on-kotlin

Writing full-stack statically-typed web apps on JVM at its simplest
https://github.com/mvysny/vaadin-on-kotlin

crud database kotlin mit-license sql2o vaadin vok

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Writing full-stack statically-typed web apps on JVM at its simplest

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# Welcome to Vaadin-On-Kotlin



> Warning: VoK 0.17 is a complete overhaul and the documentation is out-of-date.

> While the documentation is updated, please consult example apps for more details.



Vaadin-on-Kotlin is a web-application framework that includes everything needed to create database-backed web applications.

Please see the official documentation at [www.vaadinonkotlin.eu](https://www.vaadinonkotlin.eu).



Vaadin-on-Kotlin does not enforce you to use [Model-View-Controller (MVC)](https://en.wikipedia.org/wiki/Model-view-controller),

Dependency Injection (DI) nor [Service-Oriented Architecture (SOA)](https://en.wikipedia.org/wiki/Service_(systems_architecture)).

It by default does not use Spring nor JavaEE. Instead, Vaadin-on-Kotlin focuses on simplicity.



The View layer leverages component-oriented

programming as offered by the [Vaadin](https://vaadin.com) framework. Vaadin offers powerful components which are built on AJAX;

programming in Vaadin resembles programming in a traditional client-side framework such as JavaFX or Swing.



The database access layer is covered by the [vok-orm](https://github.com/mvysny/vok-orm) library.

`vok-orm` allows you to present the data from database rows as objects and embellish these data objects with business logic methods.

Using `vok-orm` is the recommended approach to access SQL databases.

Of course, you may decide not to use vok-orm and integrate with NoSQL instead, or use [JPA](https://en.wikipedia.org/wiki/Java_Persistence_API) and/or [Hibernate](https://hibernate.org/orm/).



Everything is combined with the conciseness of the [Kotlin](https://kotlinlang.org/)

programming language, which makes Vaadin-on-Kotlin a perfect starting point for beginner programmers.

And Kotlin is statically-typed, so you can always Ctrl+Click on a code and learn how it works under the hood! 



For a Getting Started guide please see the official documentation at [www.vaadinonkotlin.eu/](https://www.vaadinonkotlin.eu/).



## Getting Started



1. Please install Java 17 JDK and git client if you haven't yet.



2. Then, at the command prompt, just type in:



    ```bash

    git clone https://github.com/mvysny/vok-helloworld-app

    cd vok-helloworld-app

    ./gradlew clean build web:appRun

    ```



3. Using a browser, go to [http://localhost:8080](http://localhost:8080) and you'll see: "Yay! You're on Vaadin-on-Kotlin!"



4. Follow the guidelines to start developing your application. You may find the following resources handy:



    * [Getting Started](https://www.vaadinonkotlin.eu/gettingstarted.html)



5. For easy development, we encourage you to edit the project sources in [Intellij IDEA](https://www.jetbrains.com/idea/);

  the Community Edition is enough.



## Example project



A more polished example application which you can inspire from. Just type this into your terminal:



```bash

git clone https://github.com/mvysny/vaadin-on-kotlin

cd vaadin-on-kotlin

./gradlew vok-example-crud:run

```



The web app will be running at [http://localhost:8080](http://localhost:8080).



For more information check out the [vok-example-crud](vok-example-crud) module.



## Vaadin Example project



Head to [Beverage Buddy VoK](https://github.com/mvysny/beverage-buddy-vok) for the standalone example project.



## Run the example application from Intellij IDEA Community



1. In Intellij IDEA, open the project simply by opening the `build.gradle` file, and then selecting "Open as Project".

2. To run the application from IDEA, just open *Gradle* tab, select `vok-example-crud-vokdb / Tasks / gretty / appRun`,

   right-click and select Debug. 

   The web app will be running at [http://localhost:8080](http://localhost:8080).



If you have the Intellij IDEA Ultimate version, we recommend you to use Tomcat for development, since it offers

better code hot-redeployment:



1. Open the project in IDEA

2. Launch the `vok-example-crud-vokdb` WAR in Tomcat as described here: https://kotlinlang.org/docs/tutorials/httpservlets.html



## Contributing



We encourage you to contribute to Vaadin-on-Kotlin! Join us and discuss at [Vaadin Forums: Miscellaneous](https://vaadin.com/forum#!/category/11562).



Trying to report a possible security vulnerability in Vaadin-on-Kotlin? Please use [Vaadin Bug Tracker](https://github.com/vaadin/framework/issues).



For general Vaadin-on-Kotlin bugs, please use the [Vaadin-on-Kotlin Github Issue Tracker](https://github.com/mvysny/vaadin-on-kotlin/issues).



## Modules



Vaadin-on-Kotlin consists of several modules which provides you with handy functionality. To include the modules

into your project, you simply add appropriate Gradle jar dependencies to your `build.gradle`.



Every module contains a description of what exactly the module does, when you should use it and when

it might be better to use something else.



The list of modules:



* [vok-framework](vok-framework) - the very core of Vaadin-on-Kotlin which contains machinery

  for developing VoK plugins, and also the means to bootstrap/teardown the VoK runtime.

  Always included in your project when you build your app with VoK.

* [vok-util-vaadin](vok-util-vaadin) - when you want to have additional support for Vaadin.

  You typically include this module when you build your Vaadin-based app with VoK.

* [vok-framework-vokdb](vok-framework-v10-vokdb) - when you want to have additional support for Vaadin and

  the support for the database using the recommended approach.

  Includes [vok-util-vaadin](vok-util-vaadin10) and [vok-db](vok-db).

* [vok-rest](vok-rest) - when you want to expose data from your VoK app to other REST-consuming clients.

* [vok-rest-client](vok-rest-client) - when you want to consume data in your VoK app from other REST servers.

* [vok-db](vok-db) - Provides access to the database; uses [VoK-ORM](https://github.com/mvysny/vok-orm)

* [vok-security](vok-security) - provides basic security support. The documentation there explains the basics and provides links to sample projects.



## Code Examples



### Easy database transactions:



vok-orm:

```kotlin

button("Save", { db { person.save() } })

```



See [vok-orm](https://github.com/mvysny/vok-orm) for an explanation on how this works.



### Prepare your database



Simply use [Flyway](https://flywaydb.org): write Flyway scripts, add a Gradle dependency:

```groovy

compile 'org.flywaydb:flyway-core:7.1.1'

```

and introduce a context listener, to auto-update your database to the newest version before your app starts:

```kotlin

@WebListener

class Bootstrap: ServletContextListener {

    override fun contextInitialized(sce: ServletContextEvent?) {

        VaadinOnKotlin.init()

        val flyway = Flyway()

        flyway.dataSource = VaadinOnKotlin.getDataSource()

        flyway.migrate()

    }

}

```

Please scroll below for more details.



### Defining UI DSL-style



```kotlin

verticalLayout {

  formLayout {

    isSpacing = true

    textField("Name:") {

      focus()

    }

    textField("Age:")

  }

  horizontalLayout {

    w = 100.perc

    isSpacing = true

    button("Save") {

      onClick { okPressed() }

      setPrimary()

    }

  }

}

```



### Simple popups



```kotlin

popupView("Details") {

  verticalLayout {

    formLayout { ... }

    button("Close", { isPopupVisible = false })

  }

}

```



### vok-orm-based grid is a breeze



Support for sorting and filtering out-of-the-box:



```kotlin

grid(dataProvider = Person.dataProvider) {

  isExpand = true

  

  val filterBar = appendHeaderRow().asFilterBar(this)



  columnFor(User::id) {

      filterBar.forField(NumberRangePopup(), this).inRange()

  }

  columnFor(User::username) {

      filterBar.forField(TextField(), this).ilike()

  }

  columnFor(User::roles) {

      filterBar.forField(TextField(), this).ilike()

  }

  columnFor(User::hashedPassword)

  addButtonColumn(VaadinIcon.EDIT, "edit", { createOrEditUser(it) }) {}

  addButtonColumn(VaadinIcon.TRASH, "delete", { it.delete(); refresh() }) {}

}

```



### Advanced syntax



#### Keyboard shortcuts via operator overloading



```kotlin

import com.github.mvysny.karibudsl.v8.ModifierKey.Alt

import com.github.mvysny.karibudsl.v8.ModifierKey.Ctrl

import com.vaadin.event.ShortcutAction.KeyCode.C



button("Create New Person (Ctrl+Alt+C)") {

  onClick { ... }

  clickShortcut = Ctrl + Alt + C

}

```



#### Width/height



```kotlin

button {

  icon = ...

  w = 48.px

  h = 50.perc

}

if (button.w.isFillParent) { ... }

```



# Further Links



* Please file bug reports at the [VoK Bug Tracker](https://github.com/mvysny/vaadin-on-kotlin/issues)

* For troubleshooting, please check the [Vaadin Troubleshooting](https://mvysny.github.io/Vaadin-troubleshooting/) article.



# License



Licensed under the [MIT License](https://opensource.org/licenses/MIT).



Copyright (c) 2017-2018 Martin Vysny



All rights reserved.



Permission is hereby granted, free  of charge, to any person obtaining

a  copy  of this  software  and  associated  documentation files  (the

"Software"), to  deal in  the Software without  restriction, including

without limitation  the rights to  use, copy, modify,  merge, publish,

distribute,  sublicense, and/or sell  copies of  the Software,  and to

permit persons to whom the Software  is furnished to do so, subject to

the following conditions:



The  above  copyright  notice  and  this permission  notice  shall  be

included in all copies or substantial portions of the Software.

THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,

EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF

MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND

NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION

WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.