Add a second, portal-compatible ID to the Gradle plugin

To be compatible with Gradle's plugin portal, plugins must have an
ID that uses a reverse domain name. This means that spring-boot is
not compatible.

This commit introduces a new ID, org.springframework.boot, and
deprecates the old ID.

Closes gh-6997

Author: wilkinsona

spring-boot-docs/src/main/asciidoc/build-tool-plugins.adoc

@@ -182,7 +182,7 @@ the `spring-boot` plugin:
 			classpath("org.springframework.boot:spring-boot-gradle-plugin:{spring-boot-version}")
 		}
 	}
-	apply plugin: 'spring-boot'
+	apply plugin: 'org.springframework.boot'
 ----
 
 If you are using a milestone or snapshot release you will also need to add appropriate

spring-boot-docs/src/main/asciidoc/deployment.adoc

@@ -387,7 +387,7 @@ With Gradle, the equivalent configuration would be:
 
 [source,groovy,indent=0,subs="verbatim,quotes,attributes"]
 ----
-	apply plugin: 'spring-boot'
+	apply plugin: 'org.springframework.boot'
 
 	springBoot {
 		executable = true

spring-boot-docs/src/main/asciidoc/getting-started.adoc

@@ -240,7 +240,7 @@ endif::release[]
 	}
 
 	apply plugin: 'java'
-	apply plugin: 'spring-boot'
+	apply plugin: 'org.springframework.boot'
 
 	jar {
 		baseName = 'myproject'

spring-boot-docs/src/main/asciidoc/using-spring-boot.adoc

@@ -257,7 +257,7 @@ endif::[]
 	}
 
 	apply plugin: 'java'
-	apply plugin: 'spring-boot'
+	apply plugin: 'org.springframework.boot'
 
 	repositories {
 ifeval::["{spring-boot-repo}" != "release"]

spring-boot-integration-tests/spring-boot-gradle-tests/src/test/java/org/springframework/boot/gradle/DeprecatedPluginTests.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2012-2016 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 org.springframework.boot.gradle;
+
+import org.gradle.tooling.ProjectConnection;
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.springframework.boot.test.rule.OutputCapture;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for using the old, deprecated plugin ID.
+ *
+ * @author Andy Wilkinson
+ */
+public class DeprecatedPluginTests {
+
+	private ProjectConnection project;
+
+	private static final String BOOT_VERSION = Versions.getBootVersion();
+
+	@Rule
+	public OutputCapture output = new OutputCapture();
+
+	@Test
+	public void deprecatedIdWorksAndLogsAWarning() throws Exception {
+		this.project = new ProjectCreator().createProject("deprecated-plugin");
+		this.project.newBuild().forTasks("build")
+				.withArguments("-PbootVersion=" + BOOT_VERSION, "--stacktrace").run();
+		assertThat(this.output.toString())
+				.contains("The plugin id 'spring-boot' is deprecated");
+	}
+
+}

spring-boot-integration-tests/spring-boot-gradle-tests/src/test/resources/boot-run-resources/build.gradle

@@ -8,7 +8,7 @@ buildscript {
 }
 
 apply plugin: 'java'
-apply plugin: 'spring-boot'
+apply plugin: 'org.springframework.boot'
 
 repositories {
 	mavenLocal()

spring-boot-integration-tests/spring-boot-gradle-tests/src/test/resources/classifier-extension.gradle

@@ -9,7 +9,7 @@ buildscript {
 
 apply plugin: 'java'
 apply plugin: 'maven'
-apply plugin: 'spring-boot'
+apply plugin: 'org.springframework.boot'
 
 jar {
 	baseName =  'classifier-extension'

spring-boot-integration-tests/spring-boot-gradle-tests/src/test/resources/classifier.gradle

@@ -9,7 +9,7 @@ buildscript {
 
 apply plugin: 'java'
 apply plugin: 'maven'
-apply plugin: 'spring-boot'
+apply plugin: 'org.springframework.boot'
 
 jar {
 	baseName =  'classifier'

spring-boot-integration-tests/spring-boot-gradle-tests/src/test/resources/deprecated-plugin.gradle

@@ -0,0 +1,26 @@
+buildscript {
+	repositories {
+		mavenLocal()
+	}
+	dependencies {
+		classpath("org.springframework.boot:spring-boot-gradle-plugin:${project.bootVersion}")
+	}
+}
+
+apply plugin: 'spring-boot'
+
+group = 'deprecated-plugin'
+version = '0.0.0'
+
+repositories {
+	mavenLocal()
+	mavenCentral()
+}
+
+springBoot {
+	mainClass 'com.example.Main'
+}
+
+dependencies {
+	compile 'org.springframework.boot:spring-boot-starter'
+}

spring-boot-integration-tests/spring-boot-gradle-tests/src/test/resources/executable-jar/build.gradle

@@ -12,7 +12,7 @@ repositories {
 	mavenCentral()
 }
 
-apply plugin: 'spring-boot'
+apply plugin: 'org.springframework.boot'
 apply plugin: 'java'
 
 dependencies {