Update: Christian found a workaround for compiling code that references Ecore types. We adjusted the article.

Lots of thanks to Christian for figuring this out together.

The complete example is available on github.

Also, we included all the files as Listings at the end of the article. They are heavily commented.

Objective

Inside an Eclipse plugin, we have EMF models defined in both Xcore and Ecore, using types from each other. Also, we have a Helper Xtend class that’s called from Xcore and uses types from the same model. We want to build the Eclipse Plugin with Maven. We also don’t want to commit any generated sources (from Xtend, Xcore, or Ecore).

Issue

Usually, we would use xtend-maven-plugin to build the Xtend classes, xtext-maven-plugin to build the Xcore model, and MWE2 to build the Ecore model.

However, we have a cyclic compile-time dependency between AllGreetings calling GreetingsHelper.compileAllGreetings() which receives a parameter of type AllGreetings. We also have a cyclic dependency between AllGreetings calling GreetingsHelper.compileAllPersons() and using IPerson type.

Solution

Java (and Xtend) can solve such cycles in general, but only if they process all members at the same time. Thus, we need to make sure both Xtend and Xcore are generated within the same Maven plugin.

We didn’t find a way to include the regular Ecore generator in the same step, so we keep this in a separate MWE2-based Maven plugin.

For generating persons.ecore, we call an MWE2 workflow from Maven via exec-maven-plugin. The workflow itself gets a bit more complicated, as we use INamedElement from base.xcore as a supertype to IPerson inside persons.ecore. Thus, we need to ensure that base.xcore is loaded, available, and can be understood by the Ecore generator.

Afterwards, we use xtext-maven-plugin to generate both Xtend and the two Xcore models. To do this, we need to include all the required languages and dependencies into one single plugin in our maven pom.

The first version could not compile GreetingsHelper.compileAllPersons() because it referenced types from persons.ecore, and these could not be resolved by the EMF validator. As a workaround, we disabled the validator in the workflow.

Remarks

  • We developed this using Eclipse Mars.2.
  • The example project should be free of errors and warnings, and builds in all of Eclipse, MWE2, and Maven.

    In Maven, you might see some warnings due to an Xtext bug. It should not have any negative impact.

  • When creating the Ecore file, make sure only to use built-in types (like EString) from http://www.eclipse.org/emf/2002/Ecore. They may be listed several times.
  • In our genmodel file, Eclipse tends to replace this way of referring to platform:/resource/org.eclipse.emf.ecore/model/Ecore.genmodel#//ecore by something like ../../org.eclipse.emf.ecore/model/Ecore.genmodel#//ecore. This would lead to ConcurrentModificationException in xtext-maven-plugin or MWE2, or “The referenced packages ”{0}” and ”{1}” have the same namespace URI and cannot be checked at the same time.” when opening the GenModel editor.

    In this case, open the genmodel file with a text editor and use the platform:/resource/org.eclipse.emf.ecore/model/Ecore.genmodel#//ecore form in the genmodel:GenModel#usedGenPackages attribute. Sadly, this needs to be fixed every time the Genmodel Editor saves the file.

  • The Xcore builder inside Eclipse automatically picks up the latest EMF complianceLevel, leading to Java generics support in generated code. The maven plugin does not use the latest complianceLevel, thus we need to set it explicitly.
  • The modelDirectory setting in both Xcore and Ecore seem to be highly sensitive to leading or trailing slashes. We found it safest not to have them at all.
  • Using all the involved generators (MWE2, Xcore, Xtend, …) requires quite a few dependencies for our plugin. As a neat trick, we can define them in build.properties rather than MANIFEST.MF. This way, they are available at build time, but do not clog our run-time classpath. As we can see on the right, they are also listed separately in the Eclipse dependency editor.
  • maven-clean-plugin seems to be quite sensitive how its filesets are described. Even when disregarding the .dummy.txt entries in our pom, the *-gen directories were only cleaned if we listed them in separate fileset entries.
  • The workflow should reside within an Eclipse source folder. To separate it from real sources, we created a new source folder named workflow.

Listings

Project Layout

GreetingsHelper.xtend

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package de.nikostotz.xtendxcoremaven.greetings.helper

import de.nikostotz.xtendxcoremaven.greetings.AllGreetings

class GreetingsHelper {
    // This method is called from greetings.xcore and has AllGreetings as parameter type,
    // thus creating a dependency circle
    def static String compileAllGreetings(AllGreetings it) {
        var totalSize = 0
        // We access the AllGreetings.getGreetings() method in two different ways
        // (for-each-loop and map) to demonstrate different error messages if we omit
        // 'complianceLevel="8.0"' in greetings.xcore
        for (greeting : it.getGreetings()) {
            totalSize = totalSize + greeting.getMessage().length
        }
       
        '''
        Greetings:
            «it.getGreetings().map[greeting | greeting.getMessage()].join(", ")»
        '''
    }
   
    def static String compileAllPersons(AllGreetings it) {
        // AllGreetings.getPersons() refers to type IPerson, which is defined in Ecore.
        // This only works if we disable the validator in the MWE2 workflow.
        '''
        Hello Humans:
            «it.getPersons().map[person | person.describeMyself()].join(", ")»
        '''
    }
}

base.xcore

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@GenModel(
    // This sets the target directory where to put the generated classes.
    // Make sure NOT to start or end with a slash!
    // Doing so would lead to issues either with Eclipse builder, MWE2 launch, or Maven
    modelDirectory="de.nikostotz.xtendxcoremaven/xcore-gen",

    // required to fix an issue with xcore (see https://www.eclipse.org/forums/index.php/t/367588/)
    operationReflection="false"
)
package de.nikostotz.xtendxcoremaven.base

// This enables usage of the @GenModel annotation above. The annotation would work without
// this line in Eclipse, but Maven would fail.
// (WorkflowInterruptedException: Validation problems: GenModel cannot be resolved.)
annotation "http://www.eclipse.org/emf/2002/GenModel" as GenModel

interface INamedElement {
    String name
}

persons

persons.ecore

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< ?xml version="1.0" encoding="UTF-8"?>
<ecore:epackage xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" name="persons" nsURI="de.nikostotz.xtendxcoremaven.persons" nsPrefix="persons">
  <eclassifiers xsi:type="ecore:EClass" name="IPerson" abstract="true" interface="true"
     eSuperTypes="base.xcore#/EPackage/INamedElement">
    <eoperations name="describeMyself" lowerBound="1" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"></eoperations>
  </eclassifiers>
  <eclassifiers xsi:type="ecore:EClass" name="Human" eSuperTypes="#//IPerson">
    <estructuralfeatures xsi:type="ecore:EAttribute" name="knownHumanLanguages" upperBound="-1"
       eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"></estructuralfeatures>
  </eclassifiers>
  <eclassifiers xsi:type="ecore:EClass" name="Developer" eSuperTypes="#//IPerson">
    <estructuralfeatures xsi:type="ecore:EAttribute" name="knownProgrammingLanguages"
       upperBound="-1" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"></estructuralfeatures>
  </eclassifiers>
</ecore:epackage>

persons.genmodel

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< ?xml version="1.0" encoding="UTF-8"?>
<genmodel:genmodel xmi:version="2.0"
    xmlns:xmi="http://www.omg.org/XMI" xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore"
    xmlns:genmodel="http://www.eclipse.org/emf/2002/GenModel"
    modelDirectory="de.nikostotz.xtendxcoremaven/emf-gen" modelName="Persons"
    importerID="org.eclipse.emf.importer.ecore" complianceLevel="8.0"
    copyrightFields="false" importOrganizing="true"
    usedGenPackages="base.xcore#/1/base platform:/resource/org.eclipse.emf.ecore/model/Ecore.genmodel#//ecore">
    <!-- Eclipse tends to replace this way of referring to the Ecore genmodel
        by something like "../../org.eclipse.emf.ecore/model/Ecore.genmodel#//ecore".
        This would lead to ConcurrentModificationException in xtext-maven-plugin
        or MWE2, or "The referenced packages ''{0}'' and ''{1}'' have the same namespace
        URI and cannot be checked at the same time." when opening the GenModel editor. -->

    <foreignmodel>persons.ecore</foreignmodel>
    <genpackages prefix="Persons" basePackage="de.nikostotz.xtendxcoremaven.persons"
        disposableProviderFactory="true" ecorePackage="persons.ecore#/">
        <genclasses image="false" ecoreClass="persons.ecore#//IPerson">
            <genoperations ecoreOperation="persons.ecore#//IPerson/describeMyself"></genoperations>
        </genclasses>
        <genclasses ecoreClass="persons.ecore#//Human">
            <genfeatures createChild="false"
                ecoreFeature="ecore:EAttribute persons.ecore#//Human/knownHumanLanguages"></genfeatures>
        </genclasses>
        <genclasses ecoreClass="persons.ecore#//Developer">
            <genfeatures createChild="false"
                ecoreFeature="ecore:EAttribute persons.ecore#//Developer/knownProgrammingLanguages"></genfeatures>
        </genclasses>
    </genpackages>
</genmodel:genmodel>

greetings.xcore

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@GenModel(
    modelDirectory="de.nikostotz.xtendxcoremaven/xcore-gen",
    operationReflection="false",
   
    // This enables Java generics support in EMF (starting with version 6.0).
    // If omitted, we'd get a "Validation Problem: The method or field message is undefined" in Maven
    // because AllGreetings.getGreetings() would return an EList instead of an EList<greeting>, thus
    // we cannot know about the types of the list elements and whether they have a 'message' property.
    // In other cases, this leads to error messages like "Cannot cast Object to Greeting".
    complianceLevel="8.0"
)

package de.nikostotz.xtendxcoremaven.greetings

// referring to Ecore
import de.nikostotz.xtendxcoremaven.persons.persons.IPerson

// referring to Xtend
import de.nikostotz.xtendxcoremaven.greetings.helper.GreetingsHelper

annotation "http://www.eclipse.org/emf/2002/GenModel" as GenModel

class AllGreetings {
    contains IPerson[] persons
    contains Greeting[] greetings
   
    op String compileAllGreetings() {
        // calling Xtend inside Xcore
        GreetingsHelper.compileAllGreetings(this)
    }
   
    op String compileAllPersons() {
        // calling Xtend inside Xcore
        GreetingsHelper.compileAllPersons(this)
    }
}

class Greeting {
    String message
    refers IPerson person
}

MANIFEST.MF

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Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: %pluginName
Bundle-SymbolicName: de.nikostotz.xtendxcoremaven;singleton:=true
Bundle-Version: 1.0.0.qualifier
Bundle-ClassPath: .
Bundle-Vendor: %providerName
Bundle-Localization: plugin
Bundle-Activator: de.nikostotz.xtendxcoremaven.XtendXcoreMavenActivator
Require-Bundle: org.eclipse.core.runtime,
org.eclipse.emf.ecore;visibility:=reexport,
org.eclipse.xtext.xbase.lib,
org.eclipse.emf.ecore.xcore.lib
Bundle-RequiredExecutionEnvironment: JavaSE-1.8
Export-Package: de.nikostotz.xtendxcoremaven.greetings.impl,
de.nikostotz.xtendxcoremaven.greetings.util,
de.nikostotz.xtendxcoremaven.base,
de.nikostotz.xtendxcoremaven.base.impl,
de.nikostotz.xtendxcoremaven.base.util,
de.nikostotz.xtendxcoremaven.persons.persons,
de.nikostotz.xtendxcoremaven.persons.persons.impl,
de.nikostotz.xtendxcoremaven.persons.persons.util
Bundle-ActivationPolicy: lazy

build.properties

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#

bin.includes = .,\
               model/,\
               META-INF/,\
               plugin.xml,\
               plugin.properties
jars.compile.order = .
source.. = src/,\
           emf-gen/,\
           xcore-gen/,\
           xtend-gen/
src.excludes = workflow/
output.. = bin/
# These work the same as entries in MANIFEST.MF#Require-Bundle, but only at build time, not run-time
additional.bundles = org.eclipse.emf.mwe2.launch,\
                     org.apache.log4j,\
                     org.apache.commons.logging,\
                     org.eclipse.xtext.ecore,\
                     org.eclipse.emf.codegen.ecore.xtext,\
                     org.eclipse.emf.ecore.xcore,\
                     org.eclipse.xtend.core,\
                     org.eclipse.emf.codegen.ecore,\
                     org.eclipse.emf.mwe.core,\
                     org.eclipse.emf.mwe.utils,\
                     org.eclipse.emf.mwe2.lib

generateGenModel.mwe2

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module GenerateGenModel

var projectName = "de.nikostotz.xtendxcoremaven"
var rootPath = ".."

Workflow {
    // This configures the supported model types for EcoreGenerator.
    // Order is important.
    // Should be the same list as in Reader below.
    bean = org.eclipse.emf.ecore.xcore.XcoreStandaloneSetup {}
    bean = org.eclipse.xtend.core.XtendStandaloneSetup {}
    bean = org.eclipse.xtext.ecore.EcoreSupport {}
    bean = org.eclipse.emf.codegen.ecore.xtext.GenModelSupport {}
   
    bean = org.eclipse.emf.mwe.utils.StandaloneSetup {
        // Required for finding the platform contents (Ecore.ecore, Ecore.genmodel, ...) under all circumstances
        platformUri = "${rootPath}"
       
        // Required for finding above mentioned models inside their Eclipse plugins
        scanClassPath = true
    }
       
    // As persons.ecore refers to a type inside base.xcore (IPerson extends INamedElement),
    // we need to load base.xcore before we can generate persons.ecore.
    component = org.eclipse.xtext.mwe.Reader {
        // This configures the supported model types for this Reader.
        // Order is important.
        // Should be the same list as beans above.
        register = org.eclipse.emf.ecore.xcore.XcoreStandaloneSetup {}
        register = org.eclipse.xtend.core.XtendStandaloneSetup {}
        register = org.eclipse.xtext.ecore.EcoreSupport {}
        register = org.eclipse.emf.codegen.ecore.xtext.GenModelSupport {}
       
        // This asks the Reader to read all models it understands from these directories (and sub-directories).
        path = "model"
        path = "src"
       
        // Put the models inside a ResourceSet that's accessible by the EcoreGenerator.
        loadFromResourceSet =  {}
       
        // This is a workaround to get GreetingsHelper.compileAllPersons() compiled.
        validate = org.eclipse.xtext.mwe.Validator.Disabled {}
    }
   
    // Generate persons.ecore (via persons.genmodel).
    component = org.eclipse.emf.mwe2.ecore.EcoreGenerator {
        genModel = "platform:/resource/${projectName}/model/persons.genmodel"
        srcPath = "platform:/resource/${projectName}/emf-gen"
    }
}

pom.xml

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<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/xsd/maven-4.0.0.xsd">

    <modelversion>4.0.0</modelversion>
    <groupid>de.nikostotz.xtendxcoremaven</groupid>
    <version>1.0.0-SNAPSHOT</version>
    <artifactid>de.nikostotz.xtendxcoremaven</artifactid>

    <properties>
        <project .build.sourceEncoding>UTF-8</project>

        <!-- Java version, will be honored by Xcore / Xtend -->
        <maven .compiler.source>1.8</maven>
        <maven .compiler.target>1.8</maven>

        <!-- Xtend / Xcore -->
        <core -resources-version>3.7.100</core>
        <eclipse -text-version>3.5.101</eclipse>
        <emf -version>2.12.0</emf>
        <emf -common-version>2.12.0</emf>
        <emf -codegen-version>2.11.0</emf>
        <xtext -version>2.10.0</xtext>
        <ecore -xtext-version>1.2.0</ecore>
        <ecore -xcore-version>1.3.1</ecore>
        <ecore -xcore-lib-version>1.1.100</ecore>
        <emf -mwe2-launch-version>2.8.3</emf>
    </properties>

    <dependencies>
        <dependency>
            <groupid>org.eclipse.emf</groupid>
            <artifactid>org.eclipse.emf.common</artifactid>
            <version>${emf-common-version}</version>
        </dependency>
        <dependency>
            <groupid>org.eclipse.emf</groupid>
            <artifactid>org.eclipse.emf.ecore</artifactid>
            <version>${emf-version}</version>
        </dependency>
        <dependency>
            <groupid>org.eclipse.emf</groupid>
            <artifactid>org.eclipse.emf.ecore.xcore.lib</artifactid>
            <version>${ecore-xcore-lib-version}</version>
        </dependency>
        <dependency>
            <groupid>org.eclipse.xtext</groupid>
            <artifactid>org.eclipse.xtext.xbase.lib</artifactid>
            <version>${xtext-version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupid>org.apache.maven.plugins</groupid>
                <artifactid>maven-compiler-plugin</artifactid>
                <version>3.3</version>
            </plugin>

            <plugin>
                <artifactid>maven-clean-plugin</artifactid>
                <version>2.6.1</version>
                <configuration>
                    <filesets>
                        <fileset>
                            <excludes>
                                <exclude>.dummy.txt</exclude>
                            </excludes>
                            <directory>emf-gen</directory>
                        </fileset>
                        <fileset>
                            <excludes>
                                <exclude>.dummy.txt</exclude>
                            </excludes>
                            <directory>xtend-gen</directory>
                        </fileset>
                        <fileset>
                            <excludes>
                                <exclude>.dummy.txt</exclude>
                            </excludes>
                            <directory>xcore-gen</directory>
                        </fileset>
                    </filesets>
                </configuration>
            </plugin>

            <!-- Adds the generated sources to the compiler input -->
            <plugin>
                <groupid>org.codehaus.mojo</groupid>
                <artifactid>build-helper-maven-plugin</artifactid>
                <version>1.9.1</version>
                <executions>
                    <execution>
                        <id>add-source</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>add-source</goal>
                        </goals>
                        <configuration>
                            <!-- This should be in sync with xtext-maven-plugin//source-roots,
                                except for /model directory -->
                            <sources>
                                <source />${basedir}/emf-gen
                                <source />${basedir}/xcore-gen
                                <source />${basedir}/xtend-gen
                            </sources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <!-- Generates the Ecore model via MWE2 -->
            <plugin>
                <groupid>org.codehaus.mojo</groupid>
                <artifactid>exec-maven-plugin</artifactid>
                <version>1.4.0</version>
                <executions>
                    <execution>
                        <id>mwe2Launcher</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>java</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <mainclass>org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher</mainclass>
                    <arguments>
                        <argument>${project.basedir}/workflow/generateGenModel.mwe2</argument>
                        <argument>-p</argument>
                        <argument>rootPath=${project.basedir}/..</argument>
                    </arguments>
                    <classpathscope>compile</classpathscope>
                    <includeplugindependencies>true</includeplugindependencies>
                    <cleanupdaemonthreads>false</cleanupdaemonthreads><!-- see https://bugs.eclipse.org/bugs/show_bug.cgi?id=475098#c3 -->
                </configuration>
                <dependencies>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.mwe2.launch</artifactid>
                        <version>${emf-mwe2-launch-version}</version>
                    </dependency>

                    <dependency>
                        <groupid>org.eclipse.xtext</groupid>
                        <artifactid>org.eclipse.xtext.xtext</artifactid>
                        <version>${xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.text</groupid>
                        <artifactid>org.eclipse.text</artifactid>
                        <version>${eclipse-text-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.core</groupid>
                        <artifactid>org.eclipse.core.resources</artifactid>
                        <version>${core-resources-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.xtend</groupid>
                        <artifactid>org.eclipse.xtend.core</artifactid>
                        <version>${xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.xtext</groupid>
                        <artifactid>org.eclipse.xtext.ecore</artifactid>
                        <version>${xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.xtext</groupid>
                        <artifactid>org.eclipse.xtext.xbase</artifactid>
                        <version>${xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.codegen.ecore.xtext</artifactid>
                        <version>${ecore-xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.common</artifactid>
                        <version>${emf-common-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore</artifactid>
                        <version>${emf-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore.xmi</artifactid>
                        <version>${emf-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.codegen</artifactid>
                        <version>${emf-codegen-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.codegen.ecore</artifactid>
                        <version>${emf-codegen-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore.xcore</artifactid>
                        <version>${ecore-xcore-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore.xcore.lib</artifactid>
                        <version>${ecore-xcore-lib-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.text</groupid>
                        <artifactid>org.eclipse.text</artifactid>
                        <version>${eclipse-text-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.core</groupid>
                        <artifactid>org.eclipse.core.resources</artifactid>
                        <version>${core-resources-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.xtend</groupid>
                        <artifactid>org.eclipse.xtend.core</artifactid>
                        <version>${xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.xtext</groupid>
                        <artifactid>org.eclipse.xtext.ecore</artifactid>
                        <version>${xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.xtext</groupid>
                        <artifactid>org.eclipse.xtext.xbase</artifactid>
                        <version>${xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.codegen.ecore.xtext</artifactid>
                        <version>${ecore-xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.common</artifactid>
                        <version>${emf-common-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore</artifactid>
                        <version>${emf-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore.xmi</artifactid>
                        <version>${emf-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.codegen</artifactid>
                        <version>${emf-codegen-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.codegen.ecore</artifactid>
                        <version>${emf-codegen-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore.xcore</artifactid>
                        <version>${ecore-xcore-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore.xcore.lib</artifactid>
                        <version>${ecore-xcore-lib-version}</version>
                    </dependency>
                </dependencies>
            </plugin>

            <!-- Generates the Xtend and Xcore models -->
            <plugin>
                <groupid>org.eclipse.xtext</groupid>
                <artifactid>xtext-maven-plugin</artifactid>
                <version>${xtext-version}</version>
                <executions>
                    <execution>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <languages>
                        <language>
                            <setup>org.eclipse.xtext.ecore.EcoreSupport</setup>
                        </language>
                        <language>
                            <setup>org.eclipse.emf.codegen.ecore.xtext.GenModelSupport</setup>
                        </language>
                        <language>
                            <setup>org.eclipse.xtend.core.XtendStandaloneSetup</setup>
                            <outputconfigurations>
                                <outputconfiguration>
                                    <outputdirectory>${project.basedir}/xtend-gen</outputdirectory>
                                </outputconfiguration>
                            </outputconfigurations>
                        </language>
                        <language>
                            <setup>org.eclipse.emf.ecore.xcore.XcoreStandaloneSetup</setup>
                            <outputconfigurations>
                                <outputconfiguration>
                                    <outputdirectory>${project.basedir}/xcore-gen</outputdirectory>
                                </outputconfiguration>
                            </outputconfigurations>

                        </language>
                    </languages>
                    <!-- This should be in sync with build-helper-maven-plugin//sources,
                        except for /model directory -->
                    <sourceroots>
                        <root>${basedir}/src</root>
                        <root>${basedir}/emf-gen</root>
                        <!-- Note that we include the /model path here although it's not part
                            of the source directories in Eclipse or Maven -->
                        <root>${basedir}/model</root>
                    </sourceroots>
                    <!-- This does not work currently, as we can see by the missing lambda
                        in generated code for GreetingsHelper.compileAllGreetings(). It does work,
                        however, for xtend-maven-plugin. (see https://github.com/eclipse/xtext-maven/issues/11)-->
                    <javasourceversion>1.8</javasourceversion>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupid>org.eclipse.text</groupid>
                        <artifactid>org.eclipse.text</artifactid>
                        <version>${eclipse-text-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.core</groupid>
                        <artifactid>org.eclipse.core.resources</artifactid>
                        <version>${core-resources-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.xtend</groupid>
                        <artifactid>org.eclipse.xtend.core</artifactid>
                        <version>${xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.xtext</groupid>
                        <artifactid>org.eclipse.xtext.ecore</artifactid>
                        <version>${xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.xtext</groupid>
                        <artifactid>org.eclipse.xtext.xbase</artifactid>
                        <version>${xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.codegen.ecore.xtext</artifactid>
                        <version>${ecore-xtext-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.common</artifactid>
                        <version>${emf-common-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore</artifactid>
                        <version>${emf-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore.xmi</artifactid>
                        <version>${emf-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.codegen</artifactid>
                        <version>${emf-codegen-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.codegen.ecore</artifactid>
                        <version>${emf-codegen-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore.xcore</artifactid>
                        <version>${ecore-xcore-version}</version>
                    </dependency>
                    <dependency>
                        <groupid>org.eclipse.emf</groupid>
                        <artifactid>org.eclipse.emf.ecore.xcore.lib</artifactid>
                        <version>${ecore-xcore-lib-version}</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>

.gitignore

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bin/*
target
emf-gen/*
xcore-gen/*
xtend-gen/*