Use a fallback if no 'web' dependency is available

Closes gh-435

initializr-docs/src/main/asciidoc/configuration-guide.adoc

@@ -498,9 +498,11 @@ The same project can now be generated with `dependencies=ws` or
 A "facet" is a label on a dependency which is used to drive a code modification in the
 generated project. In the standard Initializr generator, there is only one facet that is
 actually used (`web`), but custom installations might choose to use it for their own
-purposes. The `web` facet is used to drive the inclusion of `spring-boot-starter-web` if
+purposes. The `web` facet is used to drive the inclusion of a dependency with id `web`
-any other dependency with that facet is included. The value of the "facets" property of a
+(defaulting to `spring-boot-starter-web` if such dependency is not present) when any other
-dependency is a list of strings.
+dependency with that facet is included.
+
+The value of the "facets" property of a dependency is a list of strings.
 
 
 

initializr-generator/src/main/java/io/spring/initializr/generator/ProjectRequest.java

@@ -272,7 +272,7 @@ public class ProjectRequest extends BasicProjectRequest {
 		if ("war".equals(getPackaging())) {
 			if (!hasWebFacet()) {
 				// Need to be able to bootstrap the web app
-				this.resolvedDependencies.add(metadata.getDependencies().get("web"));
+				this.resolvedDependencies.add(determineWebDependency(metadata));
 				this.facets.add("web");
 			}
 			// Add the tomcat starter in provided scope
@@ -286,6 +286,14 @@ public class ProjectRequest extends BasicProjectRequest {
 		}
 	}
 
+	private Dependency determineWebDependency(InitializrMetadata metadata) {
+		Dependency web = metadata.getDependencies().get("web");
+		if (web != null) {
+			return web;
+		}
+		return Dependency.withId("web").asSpringBootStarter("web");
+	}
+
 	/**
 	 * Add a default dependency if the project does not define any dependency.
 	 */

initializr-generator/src/test/java/io/spring/initializr/generator/ProjectGeneratorTests.java

@@ -168,6 +168,37 @@ public class ProjectGeneratorTests extends AbstractProjectGeneratorTests {
 				.hasSpringBootStarterTest().hasDependenciesCount(4);
 	}
 
+	@Test
+	public void mavenWarPomWithoutWebFacetAndWithoutWebDependency() {
+		InitializrMetadata metadata = InitializrMetadataTestBuilder.withDefaults()
+				.addDependencyGroup("core", "security", "data-jpa")
+				.build();
+		applyMetadata(metadata);
+
+		ProjectRequest request = createProjectRequest("data-jpa");
+		request.setPackaging("war");
+		generateMavenPom(request).hasSpringBootStarterTomcat()
+				.hasSpringBootStarterDependency("data-jpa")
+				.hasSpringBootStarterDependency("web") // Added by war packaging
+				.hasSpringBootStarterTest().hasDependenciesCount(4);
+	}
+
+	@Test
+	public void mavenWarPomWithoutWebFacetAndWithCustomWebDependency() {
+		Dependency customWebStarter = Dependency.withId("web", "org.acme", "web-starter");
+		InitializrMetadata metadata = InitializrMetadataTestBuilder.withDefaults()
+				.addDependencyGroup("core", "security", "data-jpa")
+				.addDependencyGroup("acme", customWebStarter)
+				.build();
+		applyMetadata(metadata);
+		ProjectRequest request = createProjectRequest("data-jpa");
+		request.setPackaging("war");
+		generateMavenPom(request).hasSpringBootStarterTomcat()
+				.hasSpringBootStarterDependency("data-jpa")
+				.hasDependency(customWebStarter) // Added by war packaging
+				.hasSpringBootStarterTest().hasDependenciesCount(4);
+	}
+
 	@Test
 	public void gradleWarWithWebFacet() {
 		Dependency dependency = Dependency.withId("thymeleaf", "org.foo", "thymeleaf");