Provide a bom that manages all modules

Closes gh-831

Author: wilkinsona

build.gradle

@@ -87,8 +87,6 @@ subprojects { subproject ->
 		}
 
 		plugins.withType(MavenPublishPlugin) {
-			subproject.apply from: "${rootProject.projectDir}/gradle/publish-maven.gradle"
-
 			javadoc {
 				description = "Generates project-level javadoc for use in -javadoc jar"
 				options.memberLevel = org.gradle.external.javadoc.JavadocMemberLevel.PROTECTED
@@ -107,7 +105,9 @@ subprojects { subproject ->
 			}
 		}
 	}
-
+	plugins.withType(MavenPublishPlugin) {
+			subproject.apply from: "${rootProject.projectDir}/gradle/publish-maven.gradle"
+	}
 	tasks.withType(GenerateModuleMetadata) {
 		enabled = false
 	}

gradle/publish-maven.gradle

@@ -21,6 +21,9 @@ plugins.withType(MavenPublishPlugin) {
 						}
 					}
 				}
+				project.plugins.withType(JavaPlatformPlugin) {
+					from components.javaPlatform
+				}
 				pom {
 					name = project.provider { project.description }
 					description = project.provider { project.description }

settings.gradle

@@ -35,6 +35,7 @@ settings.gradle.projectsLoaded {
 
 include "docs"
 include "spring-restdocs-asciidoctor"
+include "spring-restdocs-bom"
 include "spring-restdocs-core"
 include "spring-restdocs-mockmvc"
 include "spring-restdocs-platform"

spring-restdocs-bom/build.gradle

@@ -0,0 +1,16 @@
+plugins {
+	id "java-platform"
+	id "maven-publish"
+}
+
+description = "Spring REST Docs Bill of Materials"
+
+dependencies {
+	constraints {
+		api(project(":spring-restdocs-asciidoctor"))
+		api(project(":spring-restdocs-core"))
+		api(project(":spring-restdocs-mockmvc"))
+		api(project(":spring-restdocs-restassured"))
+		api(project(":spring-restdocs-webtestclient"))
+	}
+}