Add support to Java 11

initializr-service/src/main/java/io/spring/initializr/service/extension/JavaVersionRequestPostProcessor.java

@@ -39,6 +39,8 @@ class JavaVersionRequestPostProcessor implements ProjectRequestPostProcessor {
 
 	private static final Version VERSION_2_0_1 = Version.parse("2.0.1.RELEASE");
 
+	private static final Version VERSION_2_1_0_M1 = Version.parse("2.1.0.M1");
+
 	private static final List<String> UNSUPPORTED_LANGUAGES = Arrays.asList("groovy",
 			"kotlin");
 
@@ -62,12 +64,16 @@ class JavaVersionRequestPostProcessor implements ProjectRequestPostProcessor {
 		if (javaGeneration == 10 && VERSION_2_0_1.compareTo(requestVersion) > 0) {
 			request.setJavaVersion("1.8");
 		}
+		// 11 support only as of 2.1.x
+		if (javaGeneration == 11 && VERSION_2_1_0_M1.compareTo(requestVersion) > 0) {
+			request.setJavaVersion("1.8");
+		}
 	}
 
 	private Integer determineJavaGeneration(String javaVersion) {
 		try {
 			int generation = Integer.valueOf(javaVersion);
-			return ((generation > 8 && generation <= 10) ? generation : null);
+			return ((generation > 8 && generation <= 11) ? generation : null);
 		}
 		catch (NumberFormatException ex) {
 			return null;

initializr-service/src/main/java/io/spring/initializr/service/extension/SpringBoot2RequestPostProcessor.java

@@ -36,7 +36,8 @@ class SpringBoot2RequestPostProcessor extends AbstractProjectRequestPostProcesso
 
 	private static final Version VERSION_2_0_0_M1 = Version.parse("2.0.0.M1");
 
-	private static final List<String> VALID_VERSIONS = Arrays.asList("1.8", "9", "10");
+	private static final List<String> VALID_VERSIONS = Arrays.asList("1.8", "9", "10",
+			"11");
 
 	@Override
 	public void postProcessAfterResolution(ProjectRequest request,

initializr-service/src/main/resources/application.yml

@@ -1358,6 +1358,8 @@ initializr:
       id: war
       default: false
   javaVersions:
+    - id: 11
+      default: false
     - id: 10
       default: false
     - id: 1.8

initializr-service/src/test/java/io/spring/initializr/service/extension/JavaVersionRequestPostProcessorTests.java

@@ -143,4 +143,52 @@ public class JavaVersionRequestPostProcessorTests
 		generateGradleBuild(request).hasJavaVersion("10");
 	}
 
+	@Test
+	public void java11CannotBeUsedWithSpringBoot1Maven() {
+		ProjectRequest request = createProjectRequest("web");
+		request.setBootVersion("1.5.8.RELEASE");
+		request.setJavaVersion("11");
+		generateMavenPom(request).hasJavaVersion("1.8");
+	}
+
+	@Test
+	public void java11CannotBeUsedWithSpringBoot1Gradle() {
+		ProjectRequest request = createProjectRequest("data-jpa");
+		request.setBootVersion("1.99.99.BUILD-SNAPSHOT");
+		request.setJavaVersion("11");
+		generateGradleBuild(request).hasJavaVersion("1.8");
+	}
+
+	@Test
+	public void java11CannotBeUsedWithSpringBoot20Maven() {
+		ProjectRequest request = createProjectRequest("web");
+		request.setBootVersion("2.0.5.RELEASE");
+		request.setJavaVersion("11");
+		generateMavenPom(request).hasJavaVersion("1.8");
+	}
+
+	@Test
+	public void java11CannotBeUsedWithSpringBoot20Gradle() {
+		ProjectRequest request = createProjectRequest("data-jpa");
+		request.setBootVersion("2.0.5.RELEASE");
+		request.setJavaVersion("11");
+		generateGradleBuild(request).hasJavaVersion("1.8");
+	}
+
+	@Test
+	public void java11CanBeUsedWithSpringBoot21Maven() {
+		ProjectRequest request = createProjectRequest("web");
+		request.setBootVersion("2.1.0.M1");
+		request.setJavaVersion("11");
+		generateMavenPom(request).hasJavaVersion("11");
+	}
+
+	@Test
+	public void java11CanBeUsedWithSpringBoot21Gradle() {
+		ProjectRequest request = createProjectRequest("data-jpa");
+		request.setBootVersion("2.1.1.RELEASE");
+		request.setJavaVersion("11");
+		generateGradleBuild(request).hasJavaVersion("11");
+	}
+
 }