Add support for custom dependency

Prior to this commit, only spring boot starters can be added as project
dependency using a simple String denoting the suffix of the artifactId.
The standard 'org.springframework.boot' and 'spring-boot-starter-'
artifactId prefix were assumed.

This commit allows to define arbitrary dependencies with arbitrary
identifiers; the groupId, artifactId and version of the dependency can
be specified. Internally, all dependencies are converted to that format
even the ones defined as standard spring boot starters.

To allow that, a ProjectRequest is now resolved against the initializr
metadata. If a request defines an unknown dependency, a simple String
will be still considered a spring-boot-starter but a more complex
unknown id will lead to an exception (e.g. 'org.foo:bar').

Fixes gh-17

initializr-service/application.yml

@@ -9,67 +9,67 @@ info:
 initializr:
   dependencies:
     - name: Core
-      starters:
+      content:
         - name: Security
-          value: security
+          id: security
         - name: AOP
-          value: aop
+          id: aop
     - name: Data
-      starters:
+      content:
         - name: JDBC
-          value: jdbc
+          id: jdbc
         - name: JPA
-          value: data-jpa
+          id: data-jpa
         - name: MongoDB
-          value: data-mongodb
+          id: data-mongodb
         - name: Redis
-          value: redis
+          id: redis
         - name: Gemfire
-          value: data-gemfire
+          id: data-gemfire
         - name: Solr
-          value: data-solr
+          id: data-solr
     - name: I/O
-      starters:
+      content:
         - name: Batch
-        value: batch
+          id: batch
         - name: Integration
-        value: integration
+          id: integration
         - name: AMQP
-        value: amqp
+          id: amqp
     - name: Web
-      starters:
+      content:
         - name: Web
-          value: web
+          id: web
         - name: Websocket
-          value: websocket
+          id: websocket
         - name: Rest Repositories
-          value: data-rest
+          id: data-rest
         - name: Mobile
-          value: mobile
+          id: mobile
     - name: Template Engines
-      starters:
+      content:
         - name: Freemarker
-          value: freemarker
+          id: freemarker
         - name: Velocity
-          value: velocity
+          id: velocity
         - name: Groovy Templates
-          value: groovy-templates
+          id: groovy-templates
         - name: Thymeleaf
-          value: thymeleaf
+          id: thymeleaf
     - name: Social
-      starters:
+      content:
         - name: Facebook
-          value: social-facebook
+          id: social-facebook
         - name: LinkedIn
-          value: social-linkedin
+          id: social-linkedin
         - name: Twitter
-          value: social-twitter
+          id: social-twitter
     - name: Ops
-      starters:
+      content:
         - name: Actuator
-          value: actuator
+          id: actuator
         - name: Remote Shell
-          value: remote-shell
+          id: remote-shell
   types:
     - name: Maven POM
       id: pom.xml

initializr/src/main/groovy/io/spring/initializr/InitializrMetadata.groovy

@@ -1,7 +1,26 @@
+/*
+ * Copyright 2012-2014 the original author or authors.
+ *
+ * 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.
+ */
+
 package io.spring.initializr
 
+import javax.annotation.PostConstruct
+
 import com.fasterxml.jackson.annotation.JsonIgnore
 import com.fasterxml.jackson.annotation.JsonInclude
+import groovy.transform.ToString
 
 import org.springframework.boot.context.properties.ConfigurationProperties
 
@@ -36,6 +55,17 @@ class InitializrMetadata {
 
 	final Defaults defaults = new Defaults()
 
+	@JsonIgnore
+	final Map<String, Dependency> indexedDependencies = new HashMap<String, Dependency>()
+
+	/**
+	 * Return the {@link Dependency} with the specified id or {@code null} if
+	 * no such dependency exists.
+	 */
+	Dependency getDependency(String id) {
+		return indexedDependencies.get(id)
+	}
+
 	/**
 	 * Initializes a {@link ProjectRequest} instance with the defaults
 	 * defined in this instance.
@@ -54,6 +84,54 @@ class InitializrMetadata {
 		request
 	}
 
+	/**
+	 * Initialize and validate the configuration.
+	 */
+	@PostConstruct
+	void validate() {
+		for (DependencyGroup group : dependencies) {
+			for (Dependency dependency : group.getContent()) {
+				validateDependency(dependency)
+				indexDependency(dependency.id, dependency)
+			}
+		}
+	}
+
+	private void indexDependency(String id, Dependency dependency) {
+		Dependency existing = indexedDependencies.get(id)
+		if (existing != null) {
+			throw new IllegalArgumentException('Could not register ' + dependency +
+					': another dependency has also the "' + id + '" id ' + existing)
+		}
+		indexedDependencies.put(id, dependency)
+	}
+
+	static void validateDependency(Dependency dependency) {
+		String id = dependency.getId()
+		if (id == null) {
+			if (!dependency.hasCoordinates()) {
+				throw new InvalidInitializrMetadataException('Invalid dependency, ' +
+						'should have at least an id or a groupId/artifactId pair.')
+			}
+			dependency.generateId()
+		} else if (!dependency.hasCoordinates()) {
+			// Let's build the coordinates from the id
+			StringTokenizer st = new StringTokenizer(id, ':')
+			if (st.countTokens() == 1) { // assume spring-boot-starter
+				dependency.asSpringBootStarter(id)
+			} else if (st.countTokens() == 2 || st.countTokens() == 3) {
+				dependency.groupId = st.nextToken()
+				dependency.artifactId = st.nextToken()
+				if (st.hasMoreTokens()) {
+					dependency.version = st.nextToken()
+				}
+			} else {
+				throw new InvalidInitializrMetadataException('Invalid dependency, id should ' +
+						'have the form groupId:artifactId[:version] but got ' + id)
+			}
+		}
+	}
+
 	static def getDefault(List elements, String defaultValue) {
 		for (DefaultIdentifiableElement element : elements) {
 			if (element.default) {
@@ -68,10 +146,52 @@ class InitializrMetadata {
 
 		String name
 
-		final List<Map<String,Object>> starters= new ArrayList<>()
+		final List<Dependency> content = new ArrayList<Dependency>()
 
 	}
 
+	@ToString(ignoreNulls = true, includePackage = false)
+	static class Dependency extends IdentifiableElement {
+
+		@JsonIgnore
+		String groupId
+
+		@JsonIgnore
+		String artifactId
+
+		@JsonIgnore
+		String version
+
+		/**
+		 * Specify if the dependency has its coordinates set, i.e. {@code groupId}
+		 * and {@code artifactId}.
+		 */
+		boolean hasCoordinates() {
+			return groupId != null && artifactId != null
+		}
+
+		/**
+		 * Define this dependency as a standard spring boot starter with the specified name
+		 */
+		def asSpringBootStarter(String name) {
+			groupId = 'org.springframework.boot'
+			artifactId = 'spring-boot-starter-' + name
+		}
+
+		/**
+		 * Generate an id using the groupId and artifactId
+		 */
+		def generateId() {
+			if (groupId == null || artifactId == null) {
+				throw new IllegalArgumentException('Could not generate id for ' + this
+						+ ': at least groupId and artifactId must be set.')
+			}
+			StringBuilder sb = new StringBuilder()
+			sb.append(groupId).append(':').append(artifactId)
+			id = sb.toString()
+		}
+	}
+
 	static class Type extends DefaultIdentifiableElement {
 
 		String action

initializr/src/main/groovy/io/spring/initializr/InvalidInitializrMetadataException.groovy

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2012-2014 the original author or authors.
+ *
+ * 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.
+ */
+
+package io.spring.initializr
+
+/**
+ * Thrown when the configuration defines invalid metadata.
+ *
+ * @author Stephane Nicoll
+ * @since 1.0
+ */
+class InvalidInitializrMetadataException extends RuntimeException {
+
+	InvalidInitializrMetadataException(String s) {
+		super(s)
+	}
+}
+

initializr/src/main/groovy/io/spring/initializr/ProjectGenerator.groovy

@@ -123,27 +123,12 @@ class ProjectGenerator {
 
 	private Map initializeModel(ProjectRequest request) {
 		Assert.notNull request.bootVersion, 'boot version must not be null'
-		if (request.packaging == 'war' && !request.isWebStyle()) {
-			request.style << 'web'
-		}
 		def model = [:]
+		request.resolve(metadata)
 		request.properties.each { model[it.key] = it.value }
-		model.styles = fixStyles(request.style)
 		model
 	}
 
-	private def fixStyles(def style) {
-		if (style == null || style.size() == 0) {
-			style = ['']
-		}
-		if (!style.class.isArray() && !(style instanceof Collection)) {
-			style = [style]
-		}
-		style = style.collect { it == 'jpa' ? 'data-jpa' : it }
-		style.collect { it == '' ? '' : '-' + it }
-	}
-
-
 	private byte[] doGenerateMavenPom(Map model) {
 		template 'starter-pom.xml', model
 	}

initializr/src/main/groovy/io/spring/initializr/ProjectRequest.groovy

@@ -16,6 +16,9 @@
 
 package io.spring.initializr
 
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
 /**
  * A request to generate a project.
  *
@@ -25,6 +28,8 @@ package io.spring.initializr
  */
 class ProjectRequest {
 
+	private static final Logger logger = LoggerFactory.getLogger(ProjectRequest.class)
+
 	def style = []
 
 	String name
@@ -39,6 +44,37 @@ class ProjectRequest {
 	String packageName
 	String javaVersion
 
+	def dependencies = []
+
+	/**
+	 * Resolve this instance against the specified {@link InitializrMetadata}
+	 */
+	void resolve(InitializrMetadata metadata) {
+		if (packaging == 'war' && !isWebStyle()) {
+			style << 'web'
+		}
+		if (style == null || style.size() == 0) {
+			style = []
+		}
+		if (!style.class.isArray() && !(style instanceof Collection)) {
+			style = [style]
+		}
+		style = style.collect { it == 'jpa' ? 'data-jpa' : it }
+		style.collect { it == '' ? '' : '-' + it }
+		dependencies = style.collect {
+			InitializrMetadata.Dependency dependency = metadata.getDependency(it)
+			if (dependency == null) {
+				if (it.contains(':')) {
+					throw new IllegalArgumentException('Unknown dependency ' + it + ' check project metadata')
+				}
+				logger.warn('No known dependency for style ' + it + ' assuming spring-boot-starter')
+				dependency = new InitializrMetadata.Dependency()
+				dependency.asSpringBootStarter(it)
+			}
+			dependency
+		}
+	}
+
 	boolean isWebStyle() {
 		style.any { webStyle(it) }
 	}

initializr/src/main/resources/templates/home.html

@@ -110,10 +110,10 @@
                 <% dependencies.each { %>
                 <div class="form-group col-sm-6">
                 <h4>${it.name}</h4>
-                    <% it.starters.each { %>
+                    <% it.content.each { %>
                     <div class="checkbox">
                         <label>
-                            <input type="checkbox" name="style" value="${it.value}">
+                            <input type="checkbox" name="style" value="${it.id}">
                             ${it.name}
                         </label>
                     </div><% } %>

initializr/src/main/resources/templates/starter-build.gradle

@@ -39,8 +39,8 @@ repositories {
     providedRuntime
 }
 <% } %>
-dependencies {<% styles.each { %>
-    compile("org.springframework.boot:spring-boot-starter${it}")<% } %><% if (language=='groovy') { %>
+dependencies {<% dependencies.each { %>
+    compile("${it.groupId}:${it.artifactId}")<% } %><% if (language=='groovy') { %>
     compile("org.codehaus.groovy:groovy")<% } %><% if (packaging=='war') { %>
     providedRuntime("org.springframework.boot:spring-boot-starter-tomcat")<% } %>
     testCompile("org.springframework.boot:spring-boot-starter-test")

initializr/src/main/resources/templates/starter-pom.xml

@@ -18,10 +18,11 @@
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 
-	<dependencies><% styles.each { %>
+	<dependencies><% dependencies.each { %>
 		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter${it}</artifactId>
+			<groupId>${it.groupId}</groupId>
+			<artifactId>${it.artifactId}</artifactId><% if (it.version != null) { %>
+			<version>${it.version}</version><% } %>
 		</dependency><% } %><% if (language=='groovy') { %>
 		<dependency>
 			<groupId>org.codehaus.groovy</groupId>

initializr/src/test/groovy/io/spring/initializr/InitializrMetadataTests.groovy

@@ -16,15 +16,146 @@
 
 package io.spring.initializr
 
+import io.spring.initializr.support.InitializrMetadataBuilder
+import org.junit.Rule
 import org.junit.Test
+import org.junit.rules.ExpectedException
 
-import static org.junit.Assert.assertEquals
+import static org.junit.Assert.*
 
 /**
  * @author Stephane Nicoll
  */
 class InitializrMetadataTests {
 
+	@Rule
+	public final ExpectedException thrown = ExpectedException.none()
+
+	private final InitializrMetadata metadata = new InitializrMetadata()
+
+	@Test
+	void setCoordinatesFromId() {
+		InitializrMetadata.Dependency dependency = createDependency('org.foo:bar:1.2.3')
+		metadata.validateDependency(dependency)
+		assertEquals 'org.foo', dependency.groupId
+		assertEquals 'bar', dependency.artifactId
+		assertEquals '1.2.3', dependency.version
+		assertEquals 'org.foo:bar:1.2.3', dependency.id
+	}
+
+	@Test
+	void setCoordinatesFromIdNoVersion() {
+		InitializrMetadata.Dependency dependency = createDependency('org.foo:bar')
+		metadata.validateDependency(dependency)
+		assertEquals 'org.foo', dependency.groupId
+		assertEquals 'bar', dependency.artifactId
+		assertNull dependency.version
+		assertEquals 'org.foo:bar', dependency.id
+	}
+
+	@Test
+	void setIdFromCoordinates() {
+		InitializrMetadata.Dependency dependency = new InitializrMetadata.Dependency()
+		dependency.groupId = 'org.foo'
+		dependency.artifactId = 'bar'
+		dependency.version = '1.0'
+		metadata.validateDependency(dependency)
+		assertEquals 'org.foo:bar', dependency.id
+	}
+
+	@Test
+	void setIdFromCoordinatesNoVersion() {
+		InitializrMetadata.Dependency dependency = new InitializrMetadata.Dependency()
+		dependency.groupId = 'org.foo'
+		dependency.artifactId = 'bar'
+		metadata.validateDependency(dependency)
+		assertEquals 'org.foo:bar', dependency.id
+	}
+
+	@Test
+	void setIdFromSimpleName() {
+		InitializrMetadata.Dependency dependency = createDependency('web')
+
+		metadata.validateDependency(dependency)
+		assertEquals 'org.springframework.boot', dependency.groupId
+		assertEquals 'spring-boot-starter-web', dependency.artifactId
+		assertNull dependency.version
+		assertEquals 'web', dependency.id
+	}
+
+	@Test
+	void invalidDependency() {
+		thrown.expect(InvalidInitializrMetadataException)
+		metadata.validateDependency(new InitializrMetadata.Dependency())
+	}
+
+	@Test
+	void invalidIdFormatTooManyColons() {
+		InitializrMetadata.Dependency dependency = createDependency('org.foo:bar:1.0:test:external')
+
+		thrown.expect(InvalidInitializrMetadataException)
+		metadata.validateDependency(dependency)
+	}
+
+	@Test
+	void generateIdWithNoGroupId() {
+		InitializrMetadata.Dependency dependency = new InitializrMetadata.Dependency()
+		dependency.artifactId = 'bar'
+		thrown.expect(IllegalArgumentException)
+		dependency.generateId()
+	}
+
+	@Test
+	void generateIdWithNoArtifactId() {
+		InitializrMetadata.Dependency dependency = new InitializrMetadata.Dependency()
+		dependency.groupId = 'foo'
+		thrown.expect(IllegalArgumentException)
+		dependency.generateId()
+	}
+
+	@Test
+	void indexedDependencies() {
+		InitializrMetadata metadata = new InitializrMetadata()
+		InitializrMetadata.DependencyGroup group = new InitializrMetadata.DependencyGroup()
+
+		InitializrMetadata.Dependency dependency = createDependency('first')
+		group.content.add(dependency)
+		InitializrMetadata.Dependency dependency2 = createDependency('second')
+		group.content.add(dependency2)
+
+		metadata.dependencies.add(group)
+
+		metadata.validate()
+
+		assertSame dependency, metadata.getDependency('first')
+		assertSame dependency2, metadata.getDependency('second')
+		assertNull metadata.getDependency('anotherId')
+	}
+
+	@Test
+	void addTwoDependenciesWithSameId() {
+		InitializrMetadata metadata = new InitializrMetadata()
+		InitializrMetadata.DependencyGroup group = new InitializrMetadata.DependencyGroup()
+
+		InitializrMetadata.Dependency dependency = createDependency('conflict')
+		group.content.add(dependency)
+		InitializrMetadata.Dependency dependency2 = createDependency('conflict')
+		group.content.add(dependency2)
+
+		metadata.dependencies.add(group)
+
+		thrown.expect(IllegalArgumentException)
+		thrown.expectMessage('conflict')
+		metadata.validate()
+	}
+
+	@Test
+	void createProjectRequest() {
+		InitializrMetadata metadata = InitializrMetadataBuilder.withDefaults().get()
+		ProjectRequest request = doCreateProjectRequest(metadata)
+		assertEquals metadata.defaults.groupId, request.groupId
+	}
+
 	@Test
 	void getDefaultNoDefault() {
 		List elements = []
@@ -39,10 +170,23 @@ class InitializrMetadataTests {
 		assertEquals 'two', InitializrMetadata.getDefault(elements, 'three')
 	}
 
+	private static ProjectRequest doCreateProjectRequest(InitializrMetadata metadata) {
+		ProjectRequest request = new ProjectRequest()
+		metadata.initializeProjectRequest(request)
+		request
+	}
+
+	private static InitializrMetadata.Dependency createDependency(String id) {
+		InitializrMetadata.Dependency dependency = new InitializrMetadata.Dependency()
+		dependency.id = id
+		dependency
+	}
+
 	private static InitializrMetadata.JavaVersion createJavaVersion(String version, boolean selected) {
 		InitializrMetadata.JavaVersion javaVersion = new InitializrMetadata.JavaVersion()
 		javaVersion.id = version
 		javaVersion.default = selected
 		javaVersion
 	}
+
 }

initializr/src/test/groovy/io/spring/initializr/ProjectGeneratorTests.groovy

@@ -50,19 +50,6 @@ class ProjectGeneratorTests {
 				.hasSnapshotRepository().hasSpringBootStarterDependency('web')
 	}
 
-	@Test
-	void mavenWarPomWithoutWebFacet() {
-		ProjectRequest request = createProjectRequest('data-jpa')
-		request.packaging = 'war'
-		generateMavenPom(request).hasStartClass('demo.Application')
-				.hasSpringBootStarterDependency('tomcat')
-				.hasSpringBootStarterDependency('data-jpa')
-				.hasSpringBootStarterDependency('web') // Added by web facet
-				.hasSpringBootStarterDependency('test')
-				.hasDependenciesCount(4)
-
-	}
-
 	PomAssert generateMavenPom(ProjectRequest request) {
 		String content = new String(projectGenerator.generateMavenPom(request))
 		return new PomAssert(content).validateProjectRequest(request)

initializr/src/test/groovy/io/spring/initializr/ProjectRequestTests.groovy

@@ -0,0 +1,101 @@
+/*
+ * Copyright 2012-2014 the original author or authors.
+ *
+ * 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.
+ */
+
+package io.spring.initializr
+
+import io.spring.initializr.support.InitializrMetadataBuilder
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.ExpectedException
+
+import static org.junit.Assert.assertEquals
+
+/**
+ * @author Stephane Nicoll
+ */
+class ProjectRequestTests {
+
+	@Rule
+	public final ExpectedException thrown = ExpectedException.none()
+
+	@Test
+	void resolve() {
+		ProjectRequest request = new ProjectRequest()
+		InitializrMetadata metadata = InitializrMetadataBuilder.withDefaults()
+				.addDependencyGroup('code', 'web', 'security', 'spring-data').get()
+
+		request.style << 'web' << 'spring-data'
+		request.resolve(metadata)
+		assertBootStarter(request.dependencies.get(0), 'web')
+		assertBootStarter(request.dependencies.get(1), 'spring-data')
+	}
+
+	@Test
+	void resolveFullMetadata() {
+		ProjectRequest request = new ProjectRequest()
+		InitializrMetadata metadata = InitializrMetadataBuilder.withDefaults()
+				.addDependencyGroup('code', createDependency('org.foo', 'acme', '1.2.0')).get()
+		request.style << 'org.foo:acme'
+		request.resolve(metadata)
+		assertDependency(request.dependencies.get(0), 'org.foo', 'acme', '1.2.0')
+	}
+
+	@Test
+	void resolveUnknownSimpleIdAsSpringBootStarter() {
+		ProjectRequest request = new ProjectRequest()
+		InitializrMetadata metadata = InitializrMetadataBuilder.withDefaults()
+				.addDependencyGroup('code', 'org.foo:bar').get()
+
+		request.style << 'org.foo:bar' << 'foo-bar'
+		request.resolve(metadata)
+		assertDependency(request.dependencies.get(0), 'org.foo', 'bar', null)
+		assertBootStarter(request.dependencies.get(1), 'foo-bar')
+	}
+
+	@Test
+	void resolveUnknownDependency() {
+		ProjectRequest request = new ProjectRequest()
+		InitializrMetadata metadata = InitializrMetadataBuilder.withDefaults()
+				.addDependencyGroup('code', 'org.foo:bar').get()
+
+		request.style << 'org.foo:acme' // does not exist and
+
+		thrown.expect(IllegalArgumentException)
+		thrown.expectMessage('org.foo:acme')
+		request.resolve(metadata)
+	}
+
+	private static void assertBootStarter(InitializrMetadata.Dependency actual, String name) {
+		InitializrMetadata.Dependency expected = new InitializrMetadata.Dependency()
+		expected.asSpringBootStarter(name)
+		assertDependency(actual, expected.groupId, expected.artifactId, expected.version)
+	}
+
+	private static InitializrMetadata.Dependency createDependency(String groupId, String artifactId, String version) {
+		InitializrMetadata.Dependency dependency = new InitializrMetadata.Dependency()
+		dependency.groupId = groupId
+		dependency.artifactId = artifactId
+		dependency.version = version
+		dependency
+	}
+
+	private static void assertDependency(InitializrMetadata.Dependency actual, String groupId,
+										 String artifactId, String version) {
+		assertEquals groupId, actual.groupId
+		assertEquals artifactId, actual.artifactId
+		assertEquals version, actual.version
+	}
+}

initializr/src/test/groovy/io/spring/initializr/support/InitializrMetadataBuilder.groovy

@@ -34,6 +34,7 @@ class InitializrMetadataBuilder {
 	}
 
 	InitializrMetadata get() {
+		metadata.validate()
 		metadata
 	}
 
@@ -41,15 +42,22 @@ class InitializrMetadataBuilder {
 		InitializrMetadata.DependencyGroup group = new InitializrMetadata.DependencyGroup()
 		group.name = name
 		for (String id : ids) {
-			Map<String, Object> starter = new HashMap<>()
-			starter.put('name', id)
-			starter.put('value', id)
-			group.starters.add(starter)
+			InitializrMetadata.Dependency dependency = new InitializrMetadata.Dependency()
+			dependency.id = id
+			group.content.add(dependency)
 		}
 		metadata.dependencies.add(group)
 		this
 	}
 
+	InitializrMetadataBuilder addDependencyGroup(String name, InitializrMetadata.Dependency... dependencies) {
+		InitializrMetadata.DependencyGroup group = new InitializrMetadata.DependencyGroup()
+		group.name = name
+		group.content.addAll(dependencies)
+		metadata.dependencies.add(group)
+		this
+	}
+
 	InitializrMetadataBuilder addDefaults() {
 		addDefaultTypes().addDefaultPackagings().addDefaultJavaVersions()
 				.addDefaultLanguages().addDefaultBootVersions()

initializr/src/test/groovy/io/spring/initializr/support/PomAssert.groovy

@@ -16,6 +16,7 @@
 
 package io.spring.initializr.support
 
+import io.spring.initializr.InitializrMetadata
 import io.spring.initializr.ProjectRequest
 import org.custommonkey.xmlunit.SimpleNamespaceContext
 import org.custommonkey.xmlunit.XMLUnit
@@ -36,7 +37,7 @@ class PomAssert {
 
 	final XpathEngine eng
 	final Document doc
-	final Map<String, Dependency> dependencies = new HashMap<String, Dependency>()
+	final Map<String, InitializrMetadata.Dependency> dependencies = new HashMap<String, InitializrMetadata.Dependency>()
 
 	PomAssert(String content) {
 		eng = XMLUnit.newXpathEngine()
@@ -170,7 +171,7 @@ class PomAssert {
 		for (int i = 0; i < nodes.length; i++) {
 			def item = nodes.item(i)
 			if (item instanceof Element) {
-				Dependency dependency = new Dependency()
+				InitializrMetadata.Dependency dependency = new InitializrMetadata.Dependency()
 				Element element = (Element) item
 				def groupId = element.getElementsByTagName('groupId')
 				if (groupId.length > 0) {
@@ -186,24 +187,14 @@ class PomAssert {
 				}
 				dependencies.put(dependency.generateId(), dependency)
 			}
-
 		}
 	}
 
 	private static String generateId(String groupId, String artifactId) {
-		groupId + ':' + artifactId
+		InitializrMetadata.Dependency dependency = new InitializrMetadata.Dependency()
+		dependency.groupId = groupId
+		dependency.artifactId = artifactId
+		dependency.generateId()
 	}
 
-
-	private static class Dependency {
-		String groupId
-		String artifactId
-		String version
-
-		String generateId() {
-			generateId(groupId, artifactId)
-		}
-	}
-
-
 }

initializr/src/test/groovy/io/spring/initializr/web/MainControllerIntegrationTests.groovy

@@ -43,10 +43,10 @@ class MainControllerIntegrationTests extends AbstractMainControllerIntegrationTe
 
 	@Test
 	void simpleTgzProject() {
-		downloadTgz('/starter.tgz?style=data-jpa').isJavaProject().isMavenProject()
+		downloadTgz('/starter.tgz?style=org.acme:bar').isJavaProject().isMavenProject()
 				.hasStaticAndTemplatesResources(false).pomAssert()
 				.hasDependenciesCount(2)
-				.hasSpringBootStarterDependency('data-jpa')
+				.hasDependency('org.acme', 'bar', '2.1.0')
 	}
 
 	@Test

initializr/src/test/resources/application-test-default.yml

@@ -6,13 +6,22 @@ info:
 initializr:
   dependencies:
     - name: Core
-      starters:
+      content:
         - name: Web
-          value: web
+          id: web
         - name: Security
-          value: security
+          id: security
         - name: Data JPA
-          value: data-jpa
+          id: data-jpa
+    - name: Other
+      content:
+        - name: Foo
+          groupId: org.acme
+          artifactId: foo
+          version: 1.3.5
+        - name: Bar
+          id: org.acme:bar
+          version: 2.1.0
   types:
     - name: Maven POM
       id: pom.xml