Creating a custom webapp with Maven

If you just want to try out Magnolia, follow instead the tutorial called How to get and adapt a bundle with Magnolia CLI.

Introduction

What is a webapp?

A Java Web Application (webapp) is a collection of servlets, other Java classes, static resources such as HTML pages, other resources, and meta information that describes the webapp bundled together. You can run a webapp on a servlet container. A Java webapp has a typical structure. It can be packaged as a WAR file. A webapp usually contains already packed portions called libraries or modules as JAR files.

Magnolia provides several preconfigured webapps and bundles. Some of them are ideal candidates as a starting point to build your custom webapp.

 Click to display a list of the preconfigured webapps and bundles provided by Magnolia.

Magnolia provides the following stand-alone, pre-configured Apache Tomcat server that does not include a webapp:

Artifact	Download	Usage / purpose
magnolia-tomcat-barebone		A preconfigured Tomcat server ready to be used with any Magnolia webapp.

Magnolia provides the following webapps and bundles.

To get the complete list of the modules in each webapp or bundle, look at the corresponding pom file of the bundle or see Supported modules in the cloud.

Artifact name	Download	Usage	Travel demo
DX Core
dx-core-webapp		This is the DX Core webapp for projects.   Use dx-core-webapp for local Magnolia Cloud development.  Add a tomcat-bundle classifier to use with Apache Tomcat.
dx-core-demo-webapp		DX Core webapp plus the travel demo for evaluation purposes.  Add a tomcat-bundle classifier to use with Apache Tomcat.
dx-core-weblogic-webapp		Webapp tuned for Weblogic.
dx-core-websphere-webapp		Webapp tuned for Websphere.   Does not include workflow modules.
dx-core-wildfly-webapp		Webapp tuned for Wildfly.
dx-core-cloud-webapp		Mostly for internal and partner cloud Magnolia usage.  Use dx-core-webapp for local Magnolia Cloud development.
Community Edition
magnolia-empty-webapp		This is the most basic Magnolia webapp. Use this as a basis for your custom webapp.
magnolia-community-webapp		Complete Magnolia Community Edition webapp for community projects.
magnolia-community-demo-webapp		Community Edition webapp plus the travel demo for evaluation purposes.
magnolia-community-demo-bundle		magnolia-community-demo-webapp bundled with Apache Tomcat.

Requirements

We assume that you are familiar with Maven and the basics of POM files. Your Maven settings should comply with the Magnolia Maven setup, which provides access to the Magnolia Nexus repositories, and thus ensures that you can build the webapps described in the examples. If you are new to Magnolia, we recommend that you first carefully follow the Maven setup page.

Possible approaches

This section describes two approaches to define a custom webapp with Maven. For both of them, keep in mind the following:

A minimal webapp and adding modules

If your aim is a minimalistic webapp, we recommend using the magnolia-empty-webapp as a base for your webapp project. it is also the base for every Magnolia webapp and provides the essentials such as the Core and UI modules. This approach is applied on the subpage Creating a minimal webapp with Maven. It could be suitable for you, if you aim at creating a custom headless instance.

A feature-rich webapp and excluding modules

Most of the preconfigured Magnolia webapps come with a feature-rich set allowing you to accomplish a number of different tasks and run complex websites. The most prominent preconfigured Magnolia webapps are these two:

• magnolia-community-webapp
• magnolia‑dx-core‑webapp

In the Creating a DX Core webapp with Maven part of this tutorial, the magnolia-dx-core-webapp is used as a starting point. We then exclude some modules which are not necessary for the example use case.

When creating a feature-rich webapp, you cannot only exclude modules, you also need to add additional modules. Usually, it is common to do both, exclude and add modules.

Procedure overview

1. Create a webapp skeleton from a Magnolia Maven archetype.
2. Modify the POM files according to your needs.
3. Add additional resources, if necessary.
4. Build the webapp.

Creating an archetype-based webapp skeleton

Just as Maven provides archetypes to create a typical skeleton for Maven projects, Magnolia too provides an archetype to create a skeleton for a Magnolia Maven project. The Magnolia archetype comes with options for different tasks. Here, we use the magnolia-project-archetype. It is an archetype that creates a Magnolia project with its parent POM and a webapp with its own POM.

 Before running the maven archetype command, please read How to use Magnolia Maven archetypes: Check Maven settings. 

If you are not familiar with the Maven archetype plugin, please also read How to use Magnolia Maven archetypes: The archetype plugin.

The archetype command

The first step to create your Maven-based custom webapp is running the archetype command. Change into the directory where you want to create the Maven project for the Magnolia webapp. In the directory, use a shell to run the following command:

mvn archetype:generate -DarchetypeGroupId=info.magnolia.maven.archetypes -DarchetypeArtifactId=magnolia-project-archetype -DarchetypeVersion=RELEASE

While the archetype script is running, Maven prompts you to supply values for a list of parameters. Some of them are Maven-specific, others concern only Magnolia. In some cases, Maven suggests a value. To accept it, enter RETURN or specify your own value and press RETURN.

Archetype parameters

These are the parameters Maven prompts you with in the order they appear:

¹⁾ See also the Maven Guide to naming conventions on groupId, artifactId, and version.

After entering a project-name value, the archetype script lists all the values you have provided. Now you can:

• Confirm your choice by pressing RETURN. Maven will generate the skeleton based on your parameters.

• Escape the running archetype script by pressing CTRL+C. The script terminates, not creating anything. To start again, execute the archetype command as described above. 

If you have confirmed your choice of parameters, the script finishes the build with a BUILD SUCCESS message.

The webapp skeleton

Maven generates the following webapp skeleton:

custom-project-minimal/
├── custom-project-minimal-webapp
│   ├── pom.xml
│   └── src
└── pom.xml

• Line 3: The webapp's POM file, defining the modules going into the webapp.
• Line 4: The src directory, containing more subfolders. In Example 2, you add more resources to this directory.
• Line 5: The parent (actually the root) POM file of the created project. This POM file manages the dependencies.

The POM files are the central pieces of the skeleton. Make sure you understand these files since you must adapt them in the examples to define the custom webapps.

Parent POM

The content of the parent POM file, generated for bundle version 6.1:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example</groupId>
  <artifactId>custom-project-minimal</artifactId>
  <name>custom-project-minimal (parent pom)</name>
  <version>1.0-SNAPSHOT</version>
  <packaging>pom</packaging>

  <properties>
    <magnoliaBundleVersion>6.1</magnoliaBundleVersion>
    <javaVersion>1.8</javaVersion>
  </properties>
  <!-- Fill the following in, so you can use the release plugin -->

  <scm>
    <connection/>
    <developerConnection/>
    <url/>
  </scm>

  <dependencyManagement>
    <dependencies>
      <!-- Option A -->
      <!-- Importing dependencyManagement of CE bundle. -->
      <dependency>
        <groupId>info.magnolia.bundle</groupId>
        <artifactId>magnolia-bundle-parent</artifactId>
        <version>${magnoliaBundleVersion}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!-- Option B -->
      <!-- If you want to use the DX CORE. -->
      <!--
      <dependency>
        <groupId>info.magnolia.dx</groupId>
        <artifactId>magnolia-dx-core-parent</artifactId>
        <version>${magnoliaBundleVersion}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      -->
    </dependencies>
  </dependencyManagement>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.7.0</version>
        <configuration>
          <source>${javaVersion}</source>
          <target>${javaVersion}</target>
        </configuration>
      </plugin>
    </plugins>
    <!-- default resources configuration which will filter your module descriptors -->
    <resources>
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>**/*</include>
        </includes>
      </resource>
      <resource>
        <filtering>true</filtering>
        <directory>src/main/resources</directory>
        <includes>
          <include>META-INF/magnolia/*</include>
        </includes>
      </resource>
    </resources>
  </build>

  <repositories>
    <repository>
      <id>magnolia.public</id>
      <url>https://nexus.magnolia-cms.com/content/groups/public</url>
      <snapshots>
        <enabled>true</enabled>
      </snapshots>
    </repository>
    <!-- IF YOU NEED MODULES FROM THE ENTERPRISE VERSION, UNCOMMENT THE FOLLOWING REPOSITORY -->
    <!--
    <repository>
      <id>magnolia.enterprise.releases</id>
      <url>https://nexus.magnolia-cms.com/content/repositories/magnolia.enterprise.releases</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </repository>
    -->
    <repository>
      <id>vaadin-addons</id>
      <url>https://maven.vaadin.com/vaadin-addons</url>
    </repository>
  </repositories>

  <modules>
    <module>custom-project-minimal-webapp</module>
  </modules>

</project>

Properties

The properties section is where you define values such as versions. You can use the section in both the parent POM and the webapp POM.

Dependency management

In the dependencyManagement section, you define the artifact dependencies that you also add to the module in the webapp POM.

In the skeleton, Option A and Option B were created, the latter as a comment.

• Use the Option A to inherit dependency management for a Magnolia Community Edition (CE) webapp. 
  Have a look at the parent POM of the CE bundle (Magnolia release 6.1) to understand what exactly you inherit with Option A.
  
  
• Use the Option B to inherit dependency management for a Magnolia DX Core webapp.
  Importing the DX Core dependency management section also indirectly imports the CE dependency management.
  Have a look at the parent POM of the DX Core (Magnolia release 6.1) to understand what exactly you inherit with Option B. To access the parent POM of the EE bundle on Git, you need DX Core credentials.

Also, use the  dependencyManagement section to define the versions of other modules which you want to add to the webapp.

Webapp POM

The contents of the webapp POM file:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.example</groupId>
    <artifactId>custom-project-minimal</artifactId>
    <version>1.0-SNAPSHOT</version>
    <relativePath>../pom.xml</relativePath>
  </parent>
  <artifactId>custom-project-minimal-webapp</artifactId>
  <name>custom-project-minimal: webapp</name>
  <packaging>war</packaging>
  <dependencies>
    <!--
     Add your project specific dependencies here:
     A custom webapp typically is based on a magnolia webapp. The most simple and reduced bundle to start with is the "magnolia-empty-webapp" (see "option i" below).
     To see a complete list of preconfigured Magnolia webapps, have a look at https://documentation.magnolia-cms.com/display/DOCS/Bundles+and+webapps
     => Please just use one of the four below listed options!
     Make sure to use the appropriate option (A or B) in the parent pom
    -->

    <!-- option i - magnolia-empty-webapp -->
    <!-- Dependencies versions are already imported by parent pom. Requires "Option A" in the parent pom. -->
    <dependency>
      <groupId>info.magnolia</groupId>
      <artifactId>magnolia-empty-webapp</artifactId>
      <type>war</type>
    </dependency>
    <dependency>
      <groupId>info.magnolia</groupId>
      <artifactId>magnolia-empty-webapp</artifactId>
      <type>pom</type>
    </dependency>


    <!-- option ii - magnolia-community-webapp -->
    <!-- Dependencies versions are already imported by parent pom. Requires "Option A" in the parent pom. -->
    <!--
    <dependency>
      <groupId>info.magnolia.bundle</groupId>
      <artifactId>magnolia-community-webapp</artifactId>
      <type>war</type>
    </dependency>
    <dependency>
      <groupId>info.magnolia.bundle</groupId>
      <artifactId>magnolia-community-webapp</artifactId>
      <type>pom</type>
    </dependency>
    -->


    <!-- option iii - magnolia-dx-core-webapp -->
    <!-- Dependencies versions are already imported by parent pom. Requires "Option B" in the parent pom. -->
    <!--
    <dependency>
      <groupId>info.magnolia.dx</groupId>
      <artifactId>magnolia-dx-core-webapp</artifactId>
      <type>war</type>
    </dependency>
    <dependency>
      <groupId>info.magnolia.dx</groupId>
      <artifactId>magnolia-dx-core-webapp</artifactId>
      <type>pom</type>
    </dependency>
    -->

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <configuration>
          <!-- exclude jars copied "physically" from the webapp overlay - so we only get those resolved by Maven's dependency management -->
          <dependentWarExcludes>WEB-INF/lib/*.jar</dependentWarExcludes>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

Dependencies

Finally, in the dependencies section of the webapp POM, you assemble the modules which should be part of the webapp. Since you are using a preconfigured Magnolia webapp as the base, the Magnolia archetype creates and adds the following options to the webapp POM:

• magnolia-empty-webapp
• magnolia-community-webapp
• magnolia-dx-core-webapp

Each of these options has a dependency to two artifact types  –  pom and war.

Besides adding an existing webapp, you typically also add other dependencies to single modules.

Examples

For examples of creating custom webapps with Maven, see the following pages:

• Example 1: Creating a minimal webapp with Maven
• Example 2: Creating a DX Core webapp with Maven