Vert.x Gradle Plugin

An opinionated Gradle plugin for Vert.x projects.

What the plugin does

This plugin simplifies building and running Vert.x applications with Gradle.

It automatically applies the following plugins:

java (and sets the source compatibility to Java 8)
application + distribution for packaging the app for the JVM
shadow to generate fat Jars with all dependencies bundled
nebula-dependency-recommender-plugin so that you can omit versions from elements in the the Vert.x stack

The plugin automatically adds io.vertx:vertx-core as a compile dependency, so you don’t need to do it.

The plugin provides a vertxRun task that can take advantage of the Vert.x auto-reloading capabilities, so you can just run it then have you code being automatically compiled and reloaded as you make changes.

Note	If you encounter issues with your application still being running in the background due to how the Gradle caching works, then you may try running the `vertxRun` task with `gradle --no-daemon vertxRun`.

The plugin provides a vertxDebug task enabling to debug your code.

Note	Reloading is disabled while debugging. Moreover in order to prevent warnings while in debug mode, Vert.x options `maxEventLoopExecuteTime` and `maxWorkerExecuteTime` are set to `java.lang.Long.MAX_VALUE`

Minimal example

plugins {
  id 'io.vertx.vertx-plugin' version 'x.y.z' // (1)
}

repositories {
  jcenter()
}

vertx {
  mainVerticle = 'sample.App'
}

Replace x.y.z with a real version.

Provided sample.App is a Vert.x verticle, then:

gradle shadowJar builds an executable Jar with all dependencies: java -jar build/libs/simple-project-fat.jar
gradle vertxRun starts the application and automatically recompiles (gradle classes) and reloads the code when any file under src/ is being added, modified or deleted.

A slightly more elaborated example

A project using vertx-web and logback would use a build.gradle definition like the following one:

plugins {
  id 'io.vertx.vertx-plugin' version 'x.y.z'
}

repositories {
  jcenter()
}

dependencies {
  compile "io.vertx:vertx-web" // (1)
  compile "ch.qos.logback:logback-classic:1.2.3" // (2)
}

vertx {
  mainVerticle = "sample.App"
  vertxVersion = "3.5.3" // (3)
}

Part of the Vert.x stack, so the version can be omitted.
Logback needs a version.
You can override to point to any specific release of Vert.x.

Kotlin projects

This plugin works with Kotlin projects too:

plugins {
  id 'io.vertx.vertx-plugin' version 'x.y.z'
  id 'org.jetbrains.kotlin.jvm' version 'a.b.c'
}

repositories {
  jcenter()
}

dependencies {
  compile 'io.vertx:vertx-lang-kotlin'
  compile 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'  // (1)
}

vertx {
  mainVerticle = "sample.MainVerticle"  // (2)
}

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {   // (3)
  kotlinOptions {
    jvmTarget = "1.8"
  }
}

This pulls all the Kotlin standard library dependencies for JDK 8+.
This verticle can be written in Kotlin (or Java).
By default Kotlin compiles to Java 6 bytecode, so it is worth changing all compilation tasks to match Java 8 bytecode.

Configuration

The configuration happens through the vertx Gradle extension.

The following configuration can be applied, and matches the vertx run command-line interface when possible:

Option	Description	Default value
`vertxVersion`	the Vert.x version to use	`"3.5.3"`
`launcher`	the main class name	`io.vertx.core.Launcher`
`mainVerticle`	the main verticle	`""`
`args`	a list of command-line arguments to pass	`[]`
`config`	either a file or direct JSON data to provide configuration	`""`
`workDirectory`	the working directory	`project.projectDir`
`jvmArgs`	extra JVM arguments	`[]`
`redeploy`	whether automatic redeployment shall happen or not	`true`
`watch`	Ant-style matchers for files to watch for modifications	[`src/*/`]
`onRedeploy`	the Gradle tasks to run before redeploying	`["classes"]`
`redeployScanPeriod` / `redeployGracePeriod` / `redeployTerminationPeriod`	tuning for the redeployment watch timers	`1000L` (1 second each)
`debugPort`	The debugger port	`5005L`
`debugSuspend`	Whether or not the application must wait until a debugger is attached to start	`false`

The default values are listed in src/main/kotlin/io/vertx/gradle/VertxExtension.kt.

By default redeployment is enabled, running gradle classes to recompile, and watching all files under src/.

Licensing

Copyright 2017-2018 Red Hat, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Credits

The plugin was originally created by Julien Ponge.

Thanks to the folks at Gradle for their guidance and technical discussions:

Cédric Champeau
Stefan Oheme
Rodrigo B. de Oliveira
Eric Wendelin
Benjamin Muschko

Thanks also to all the contributors to this project.

mpodlodowski/vertx-gradle-plugin