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Table of Contents generated with DocToc

• Gradle Plugin for Building Mule Apps
  • Compatibility
  • Install the plugin locally
  • Enabling your project to build through the Command Line
  • Start a new Project
  • Enterprise Features
    • Uploading your apps to the Management Console
    • Uploading your apps to Cloudhub
  • Working with MuleStudio
  • Fine-grained Control over Mule Components
  • Special Features
  • Mule Embedded in Java Apps
  • Mule Domain Apps
    • Definition Mechanics
    • Restrictions in the configuration
    • Shared Libraries in Domains
    • Domain Goodies

Gradle Plugin for Building Mule Apps

This plugin allows the user to build mule applications with the gradle build system.

Compatibility

Please see our compatibility matrix to understand which version of the gradle plugin to use.

Install the plugin locally

Optional: The plugin needs to reside in some place that gradle is able to find. We will use the maven local repository as most of the Mule artifacts are hosted in a maven repository.

Build the plugin and install it to your local maven repository:

$ gradle clean publishToMavenLocal

Note: Since 1.0.0 the plugin has been published into MuleSoft's community maven repository, so you can simply proceed to the next step.

Enabling your project to build through the Command Line

Add into an existing project's root a build.gradle file with the following contents:

buildscript {
	dependencies {
		classpath group: 'org.mulesoft.build', name: 'mule-gradle-plugin', version: '1.2.2'
	}

	repositories {
		maven {
		    url 'http://repository.mulesoft.org/releases'
		}
	}
}

apply plugin: 'mule'

mule.version = '3.5.0'

How to build your app:

$ gradle build

This plugin also adds two dependency scopes to gradle that are important for container-based type of projects:

• providedCompile: similar to the provided scope in maven.
• providedRuntime: Libraries that are available on the runtime itself.

New features will be added in the future.

Start a new Project

If you create an empty folder and inside an initial build.gradle like the one shown in Enabling your project to build through the Command Line, you can create the full project structure automatically, you simply need to run the initMuleProject task and the plugin will create the necessary directories and files for you. After the task completes, you'll have a working example project suitable for running with runApp, deploying it on a standalone server or in CloudHub.

$ gradle initMuleProject

You can as well easily convert it into a MuleStudio project, following the instructions discussed in Working with MuleStudio.

Enterprise Features

By default gradle projects are enterprise-enabled, this is controlled by mule.muleEnterprise project configuration.

Mulesoft's enterprise artifacts are deployed in a password-protected nexus instance. The plugin allows you to specify the credentials so gradle can resolve these dependencies.

In order to use this repository, an enterprise user can specify these credentials in the build script using the following settings:

mule.enterpriseRepoUsername = 'your-username'
mule.enterpriseRepoPassword = 'your-password'

Currently, externalization of these credentials is left to the user's preferred method.

This repo will not be enabled if mule.muleEnterprise is set to false.

Uploading your apps to the Management Console

This set of plugins ship as well with one for the Mule Management Console. This plugin currently allows to upload to the management console the resulting artifact and define several environments through a concise DSL.

In order to use this, your project needs to apply the mmc plugin:

apply plugin: 'mmc'

After that simply define your MMC environments, with their url, username and passwords.

mmc.environments {
    dev url: 'http://managmentConsole:8080/mmc', appName:'myApp', version:'1.0.2'
}

The DSL allows 5 configuration parameters.

• The name of the method (in the previous example dev is the name of the environment, this is not restricted, you can use whatever name you'd like as a description for your env.
• url: Is the url where the management console is deployed. This url needs to be without the /api path.
• username and password: The credentials to log in to the MMC API.
• appName: The name of the app in the repository, by default it will be the name of the project.
• version: The version of the app in the repository, by default it will be the project's version.

A couple more examples to illustrate the DSL's usage:

mmc.environments {
    dev url: 'http://managmentConsole:8080/mmc', appName:'myApp', version:'1.0.2'
    prod url: 'http://prodEnv:8080/mmc', username: 'admin', password: 'test'
    'pre-prod' url: 'http://preprodEnv:8080/mmc', username: 'admin', password: 'test'
    
    defaultEnvironment = 'prod'
}

NOTE: Use the mmc.defaultEnvironment property to control where the built app will be deployed.

Finally, to upload the app to the target repository, run the uploadToRepository task.

$ gradle uploadToRepository

Uploading your apps to Cloudhub

This set of plugins ship as well with one for Cloudhub. This plugin currently allows to deploy the resulting app to a cloudhub domain and and define several environments through a concise DSL.

In order to use this, your project needs to apply the cloudhub plugin:

apply plugin: 'cloudhub'

After that simply define your Cloudhub environments, with their domain name, username and password.

cloudhub.domains {
    myapp  username: 'login-username', password: 'pass'
}

In the dsl, the name of the method is the domain where to deploy your app. If your domain contains characters that are not valid for method names, you can simply use a string as method name, the following examples illustrate further the configuration:

cloudhub.domains {
    myapp  username: 'login-username', password: 'pass'
    'myapp-dev' username: 'dev-username', password: 'pass'
    
    defaultDomain = 'myapp-dev'
}

In order to perform the deployment, simply call the deploy task:

$ gradle deploy

The build will succeed if the app is correctly uploaded.

Working with MuleStudio

The package itself contains as well a plugin to update MuleStudio's build path when adding dependencies.

To enable this support, edit your build.gradle script and change the following:

apply plugin: 'mulestudio'

For the time being this combines the Eclipse Plugin and the Mule plugin, so, in order to update the studio classpath, just run:

$ gradle clean studio

In the future extra functionality will be added to polish the studio integration.

Fine-grained Control over Mule Components

By default, this gradle plugin has configured a fair number of mule components that should satisfy the majority of standard app builds, nevertheless this can be tuned at will i.e. to remove modules that older versions of mule didn't have or to add newer modules unknown at the time of building this plugin. Finally, this is useful to troubleshoot build issues, that may happen upon unpublished artifacts or restrictive company policies.

NOTE: Newer modules can be added as well as standard dependencies but this method offers a less-verbose approach.

To verify which mule components are installed, just run

$ gradle muleDeps

Now let's see an example on how to remove the deprecated jdbc transport from the standard build and add the new DB module.

mule.components {

    //exclude jdbc transport, deprecated in 3.5.0
    transports -= 'jdbc'

    //include DB module.
    modules += 'db'
}

Mule provides many pluggable components, mainly in the form of external modules and cloud connectors. These modules can be built either with mule's devkit or created manually. The mule plugin extension adds DSL to easily add these elements to the build through 3 main DSL calls:

• The method plugin(group: , name:, version:, noClassifier:, noExt:) is the main call of specifying these external plugins.
• The method connector(name:, version:, noClassifier:, noExt:) is a shortcut that includes the de-facto group for most cloud connectors.
• The method module(name:, version:, noClassifier:, noExt:) is a shortcut that includes the de-facto group for most devkit (and non-devkit) modules.

The arguments for the three methods except noClassifier and noExt are equal in meaning to the ones used when specifying dependencies, the remaining are used for:

• noClassifier: This is a boolean value indicating that we don't want to use the 'plugin' classifier when including the dependency.
• noExt: This is a boolean value indicating that we we don't want to use a 'zip' plugin in our distribution but to use the default 'jar' with dependencies approach. This maximizes the compatibility with IDE's including Mule Studio or IntelliJ with the downside of adding unwanted jars into our build.

Now let's see an example of how this DSL would look like:

mule.components {
    
    //add a cloud connector
    connector name: 'mule-module-cors', version: '1.1'

    //add an external module
    module name: 'mule-module-apikit-plugin', version: '1.3', noClassifier: true
}

NOTE: When adding dependencies through this method, the final place where these will be on the archive depends on whether the component is packaged as a jar library or an app plugin, in the first case, the jar and its dependencies will end up in the archive's lib/ directory and in the second case, the zip will end in the archive's plugins/ directory.

Special Features

Many apps can be run and tested directly by executing:

$ gradle runApp

The build can be configured to deploy the resulting artifact on a mule standalone server:

mule.installPath = '/path/to/mule/home'

Alternatively it can be configured through the MULE_HOME environment variable. Finally to deploy:

$ gradle deployLocally

Mule Embedded in Java Apps

This plugin provides a way for adding mule modules to embedded java apps, this is particularly useful when embedding mule integrations inside a Java App. In order to add mule dependencies automatically to the compile configuration:

buildscript {
	dependencies {
		classpath group: 'org.mulesoft.build', name: 'mule-gradle-plugin', version: '1.2.2'
	}

	repositories {
		mavenLocal()
	}
}

apply plugin: 'java'
apply plugin: 'mule-dependencies' 

Mule Domain Apps

Starting from Mule ESB 3.5.0, both community and enterprise received the 'Shared resources' feature, this entails a new way of packaging apps and a new file where shared resources are declared.

This process is analogous to a multi-module project with a root descriptor and therefore the approach taken by this plugin is to take advantage of Gradle's multi-project builds.

So the typical project structure will be the following:

• Project Root
  • /src/main/domain/mule-domain-config.xml: Here is where the shared resources are configured.
  • /build.gradle: This will have a slightly different structure than regular projects.
  • /settings.gradle: This is where all the modules are declared.
  • /module 1
  • /module 2
  • ...
  • /module N: Modules have the same structure as regular projects.

Definition Mechanics

In order to start a domain project, you can start with a build.gradle similar to the following:

buildscript {
	dependencies {
		classpath group: 'org.mulesoft.build', name: 'mule-gradle-plugin', version: '1.2.2'
	}

	repositories {
		maven {
		    url 'http://repository.mulesoft.org/releases'
		}
	}
}

apply plugin: 'mule-domain'

mule.version = '3.5.0'

And the following settings.gradle to define the modules, in this example we have defined the api and backend modules but you can define as many as you need.

include 'api', 'backend'

Finally, we can run the initDomain task, this will perform several actions for us:

• Create a directory for each module.
• Run initMuleProject task on each created directory.
• Create an initial mule-domain-config.xml with a shared example HTTP Connector.

Once this process is done, the domain is ready to be packaged and deployed.

Restrictions in the configuration

While we try to keep configuration of the different modules as flexible as possible, there are some restrictions that come from the same nature of a domain:

• The config parameter mule.version is shared and configured at the domain project level. The reason behind this restriction is that the domain with its modules will run necessarily all in the same Mule instance.
• The config parameter mule.muleEnterprise is also shared since there is no way a Mule container can be both CE and EE at the same time.
• The config parameters mule.enterpriseRepoUsername and mule.enterpriseRepoPassword are shared, this is just for usability.

Shared Libraries in Domains

Mule Domains allow us to share libraries between modules, in order to configure shared libraries, simply add dependencies in the compile scope.

NOTE: A domain project is more limited than a normal mule project, no classes or unit tests are allowed, so for this reason only two dependency scopes are defined:

• compile: Use this to include shared jars
• providedCompile: Use this to include any jar present in the runtime but needed in your IDE.

All mule dependencies present in a non-domain project are also present in the providedCompile scope, this is like this so IDE's can find the XSDs shipped in the Jars that are used when editing the domain config file.

The following example shows how to add a library:

//dependencies that are shared between the modules, installed in the domain's lib dir.
dependencies {
    compile group: 'org.apache.activemq', name: 'activemq-all', version: '5.9.1'
}

Domain Goodies

• install task is now 'Domain-aware' and can be used to deploy a domain with its submodules directly.
• The domain plugin has the ability to check if all modules are correctly configured, just run the checkDomain task.
• If some module is not correctly configured for the domain, the fixDomain task allows you to fix the module settings.