Wouldn’t it be nice if you could manage your Liferay Maven projects from Liferay
IDE? You can! Liferay IDE 2.0 introduces the Maven project configurator
m2e-liferay), or the added support of configuring Maven projects as full
Liferay IDE projects. This tutorial explains what the Maven project
configurator does, how to install it, and how to install its dependencies. As
you read through it, you’ll examine the structure of Liferay Maven projects and
explore some configuration options.
In order to properly support Maven projects in the IDE, you first need a mechanism to recognize Maven projects as Liferay IDE projects. IDE projects are recognized in Eclipse as faceted web projects that include the appropriate Liferay plugin facet. Therefore, all IDE projects are also Eclipse web projects (faceted projects with the web facet installed). In order for the IDE to recognize the Maven project and for it to be able to leverage Java EE tooling features (e.g., the Servers view) with the project, the project must be a flexible web project. Liferay IDE relies on the following Eclipse plugins to provide this capability:
m2e-core(Maven integration for Eclipse)
m2e-wtp(Maven integration for WTP)
m2e-core plugin provides the standard Maven tooling support for Eclipse.
It provides dependency resolution classpath management and an abstract project
configuration framework for adapters. The
m2e-wtp plugin provides project
configuration mappings between the Maven models, described in the Maven
project’s POMs, and the corresponding flexible web project supported in Eclipse.
This allows a Liferay Maven project to be recognized as a flexible web project.
m2e-liferay plugin installation includes these plugins and installs them by
default. With these integration features in place, the only remaining
requirement is making sure that the
m2e-core plugin can recognize the extra
lifecycle metadata mappings necessary for supporting Liferay’s custom goals.
Let’s break down the lifecycle mappings just a bit to get a better understanding
of what this means.
Both Maven and Eclipse have their own standard build project lifecycles that are
independent from each other. For both to work together and run seamlessly within
Liferay IDE, a lifecycle mapping is required to link both lifecycles into one
combined lifecycle. Normally, this would have to be done manually by the user.
m2e-liferay plugin combines the lifecycle metadata mapping
and Eclipse build lifecycles, to provide a seamless user experience. The
lifecycle mappings for your project can be viewed by right-clicking your project
and selecting Properties → Maven → Lifecycle Mapping.
When first installing Liferay IDE, the installation startup screen lets you select whether you’d like to install the Maven plugins automatically. Don’t worry if you missed this during setup. To install the required Maven plugins, navigate to Help → Install New Software. In the Work with field, insert the following value:
Liferay IDE repository - http://releases.liferay.com/tools/ide/latest/milestone/
m2e-liferay plugin does not appear, then it’s already installed. To
verify that it’s installed, uncheck the Hide items that are already installed
checkbox and look for
m2e-liferay in the list of installed plugins. Also, if
you’d like to view everything that is bundled with the
uncheck the Group items by category checkbox.
Awesome! The required Maven plugins are installed and your IDE instance is ready to be mavenized! Next, you’ll learn how to configure an existing Maven project.
Now that your Liferay IDE is Maven-ready, you can examine the anatomy of a Liferay Maven project. Note, you don’t need to have an existing Liferay Maven project to continue. However, if you’d like to create a new Liferay Maven portlet project in the IDE before proceeding, you can do so by following instructions in the tutorial Developing Liferay Portlets with Maven. Alternatively, you can import an existing Maven project by navigating to File → Import → Maven and selecting the location of Maven project’s source code.
m2e-core plugin delegates your Liferay Maven plugin’s project
configuration to the
m2e-liferay project configurator. The
configurator then converts your Liferay WAR package into an Eclipse flexible web
project. Next, the
m2e-liferay configurator looks for the Liferay Maven plugin
to be registered on the POM effective model for WAR type packages. If no Liferay
Maven plugin is configured on the effective POM for the project, project
configuration ceases. If the plugin is configured, the project configurator
validates your project’s configuration, checking it’s POM, parent POM, and the
project’s properties. The configurator detects invalid properties and reports
them as errors in the IDE’s POM editor. There are a list of key properties that
your project must specify in order for it to become a valid Liferay IDE project.
Using Maven Parent Plugin Projects
tutorial identifies these properties and explains how they are used.
Liferay IDE’s Quick Fix features provide two options for resolving missing Liferay Maven properties in a Liferay Maven plugin project. To access the Quick Fix dialog, right-click the error and select Quick Fix. The following two options are presented:
- Quick Fix Option 1: Create a new maven profile based on a Liferay runtime and attach it to the project.
- Quick Fix Option 2: Select existing maven profiles to attach the current project.
Quick Fix Option 1: Creating a new Maven profile based on a Liferay runtime
After you select this fix and click Finish. The Create New Maven Profile dialog appears with a profile that was generated automatically based on your runtime.
The profile location is set to the project
pom.xmlby default. You can alternatively select your local
Click OK to finish quick fix.
Quick Fix Option 2: Selecting an existing Maven profile
After you select this fix, the Select Active profile dialog appears. The profiles in Profile Id column on the left are read from your local
Add one or more active profiles to the Profile Id column on the right and then click OK.
Click Finish to apply the profiles.
You can also manually specify required Liferay properties in either the Maven
profile of the global
settings.xml file (recommended), in the user
settings.xml file, in the parent
pom.xml, or in the project
directly. Each file is described below:
settings.xml: provides configuration for all plugins belonging to all users on a machine. This file resides in the
settings.xml: provides configuration for all plugins belonging to a single user on a machine. This file resides in the
pom.xml: provides configuration for all modules in the parent project.
pom.xml: provides configuration for the single plugin project.
You can think of these choices as a hierarchy for how your Maven plugins receive
their properties. The project
pom.xml overrides the parent
pom.xml overrides the user
settings.xml file, and the user
settings.xml file overrides the global
Note that if a profile is active from your user
settings.xml, its values
override your properties in a POM. If you’d like to specify the properties in a
POM, see the
Using Liferay Maven Parent Plugin Projects
tutorial for more details.
Here’s an example of what a Maven profile looks like inside the
Once you’ve configured a Maven profile in your user
settings.xml file, you can
activate the profile by right-clicking on
[your project] → Properties
→ Maven and entering the profile IDs that supply the necessary settings
into the Active Maven Profiles text field. For example, to reference the
profile and properties we listed above, you’d enter sample for the Active
Maven Profile. Once you’ve specified all the values, the configurator
m2e-liferay) validates the properties. If there are errors in the
file, the configurator marks them in Liferay IDE’s POM editor. If you fix a
project error, update the project to persist the fix by right-clicking
[your project] → Maven → Update Project.
After your POM configuration meets the requirements, the configurator installs the Liferay plugin facet and your Maven project is officially a Liferay IDE project!
You can execute Maven goals such as
You can access and execute any of your project’s Maven goals by right-clicking
[your project] → Liferay → Maven and select the goal you want to
execute. To learn more about Maven’s build lifecycle and plugin goals, visit
Apache’s Build Lifecycle
When working with your
pom.xml file in the IDE, you’ll notice that the editor has several
different modes. Each mode is described in the following listing:
Overview: provides a graphical interface where you can add to and edit the
Dependencies: provides a graphical interface for adding and editing dependencies in your project, as well as modifying the
dependencyManagementsection of the
Effective POM: provides a read-only version of your project POM merged with its parent POM(s),
settings.xml, and the settings in Eclipse for Maven.
Dependency Hierarchy: provides a hierarchical view of project dependencies and an interactive listing of resolved dependencies.
pom.xml: provides an editor for your POM’s source XML.
The figure below, shows the
pom.xml file editor and its modes.
By taking advantage of these interactive modes, modifying and organizing your POM and its dependencies has never been easier!