Use resolved bom as source of javadoc links

Closes gh-44878

buildSrc/src/main/java/org/springframework/boot/build/bom/BomResolver.java

@@ -17,7 +17,9 @@
 package org.springframework.boot.build.bom;
 
 import java.io.File;
+import java.net.URI;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -40,9 +42,12 @@ import org.w3c.dom.Document;
 import org.w3c.dom.NodeList;
 
 import org.springframework.boot.build.bom.Library.Group;
+import org.springframework.boot.build.bom.Library.Link;
 import org.springframework.boot.build.bom.Library.Module;
 import org.springframework.boot.build.bom.ResolvedBom.Bom;
 import org.springframework.boot.build.bom.ResolvedBom.Id;
+import org.springframework.boot.build.bom.ResolvedBom.JavadocLink;
+import org.springframework.boot.build.bom.ResolvedBom.Links;
 import org.springframework.boot.build.bom.ResolvedBom.ResolvedLibrary;
 
 /**
@@ -85,15 +90,23 @@ class BomResolver {
 					imports.add(bom);
 				}
 			}
+			List<JavadocLink> javadocLinks = javadocLinksOf(library).stream()
+				.map((link) -> new JavadocLink(URI.create(link.url(library)), link.packages()))
+				.toList();
 			ResolvedLibrary resolvedLibrary = new ResolvedLibrary(library.getName(),
 					library.getVersion().getVersion().toString(), library.getVersionProperty(), managedDependencies,
-					imports);
+					imports, new Links(javadocLinks));
 			libraries.add(resolvedLibrary);
 		}
 		String[] idComponents = bomExtension.getId().split(":");
 		return new ResolvedBom(new Id(idComponents[0], idComponents[1], idComponents[2]), libraries);
 	}
 
+	private List<Link> javadocLinksOf(Library library) {
+		List<Link> javadocLinks = library.getLinks("javadoc");
+		return (javadocLinks != null) ? javadocLinks : Collections.emptyList();
+	}
+
 	Bom resolveMavenBom(String coordinates) {
 		return bomFrom(resolveBom(coordinates));
 	}

buildSrc/src/main/java/org/springframework/boot/build/bom/CreateResolvedBom.java

@@ -49,10 +49,10 @@ public abstract class CreateResolvedBom extends DefaultTask {
 	public abstract RegularFileProperty getOutputFile();
 
 	@TaskAction
-	void describeDependencyManagement() throws IOException {
-		ResolvedBom dependencyManagement = this.bomResolver.resolve(this.bomExtension);
+	void createResolvedBom() throws IOException {
+		ResolvedBom resolvedBom = this.bomResolver.resolve(this.bomExtension);
 		try (FileWriter writer = new FileWriter(getOutputFile().get().getAsFile())) {
-			dependencyManagement.writeTo(writer);
+			resolvedBom.writeTo(writer);
 		}
 	}
 

buildSrc/src/main/java/org/springframework/boot/build/bom/ResolvedBom.java

@@ -21,6 +21,7 @@ import java.io.FileReader;
 import java.io.IOException;
 import java.io.UncheckedIOException;
 import java.io.Writer;
+import java.net.URI;
 import java.util.List;
 
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
@@ -66,7 +67,7 @@ public record ResolvedBom(Id id, List<ResolvedLibrary> libraries) {
 	}
 
 	public record ResolvedLibrary(String name, String version, String versionProperty, List<Id> managedDependencies,
-			List<Bom> importedBoms) {
+			List<Bom> importedBoms, Links links) {
 
 	}
 
@@ -109,4 +110,12 @@ public record ResolvedBom(Id id, List<ResolvedLibrary> libraries) {
 
 	}
 
+	public record Links(List<JavadocLink> javadoc) {
+
+	}
+
+	public record JavadocLink(URI uri, List<String> packages) {
+
+	}
+
 }

buildSrc/src/main/java/org/springframework/boot/build/docs/ConfigureJavadocLinks.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2012-2025 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
+ *
+ *      https://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.build.docs;
+
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.gradle.api.Action;
+import org.gradle.api.file.FileCollection;
+import org.gradle.api.tasks.javadoc.Javadoc;
+import org.gradle.external.javadoc.StandardJavadocDocletOptions;
+
+import org.springframework.boot.build.bom.ResolvedBom;
+import org.springframework.boot.build.bom.ResolvedBom.JavadocLink;
+
+/**
+ * An {@link Action} to configure the links option of a {@link Javadoc} task.
+ *
+ * @author Andy Wilkinson
+ */
+public class ConfigureJavadocLinks implements Action<Javadoc> {
+
+	private final FileCollection resolvedBoms;
+
+	private final Collection<String> includedLibraries;
+
+	public ConfigureJavadocLinks(FileCollection resolvedBoms, Collection<String> includedLibraries) {
+		this.resolvedBoms = resolvedBoms;
+		this.includedLibraries = includedLibraries;
+	}
+
+	@Override
+	public void execute(Javadoc javadoc) {
+		javadoc.options((options) -> {
+			if (options instanceof StandardJavadocDocletOptions standardOptions) {
+				configureLinks(standardOptions);
+			}
+		});
+	}
+
+	private void configureLinks(StandardJavadocDocletOptions options) {
+		ResolvedBom resolvedBom = ResolvedBom.readFrom(this.resolvedBoms.getSingleFile());
+		List<String> links = new ArrayList<>();
+		links.add("https://docs.oracle.com/en/java/javase/17/docs/api/");
+		links.add("https://jakarta.ee/specifications/platform/9/apidocs/");
+		resolvedBom.libraries()
+			.stream()
+			.filter((candidate) -> this.includedLibraries.contains(candidate.name()))
+			.flatMap((library) -> library.links().javadoc().stream())
+			.map(JavadocLink::uri)
+			.map(URI::toString)
+			.forEach(links::add);
+		options.setLinks(links);
+	}
+
+}

spring-boot-project/spring-boot-docs/build.gradle

@@ -1,3 +1,5 @@
+import org.springframework.boot.build.docs.ConfigureJavadocLinks
+
 plugins {
 	id "dev.adamko.dokkatoo-html"
 	id "java"
@@ -200,7 +202,6 @@ dokkatoo {
 }
 
 task aggregatedJavadoc(type: Javadoc) {
-	dependsOn dependencyVersions
 	project.rootProject.gradle.projectsEvaluated {
 		Set<Project> publishedProjects = rootProject.subprojects.findAll { it != project }
 			.findAll { it.plugins.hasPlugin(JavaPlugin) && it.plugins.hasPlugin(MavenPublishPlugin) }
@@ -222,24 +223,7 @@ task aggregatedJavadoc(type: Javadoc) {
 			use = true
 			windowTitle = "Spring Boot ${project.version} API"
 		}
-		doFirst {
-			def versionConstraints = dependencyVersions.versionConstraints
-			def toMajorMinorVersion = version -> {
-				String formatted = version.split("\\.").take(2).join('.') + '.x'
-				return version.endsWith("-SNAPSHOT") ? formatted + "-SNAPSHOT" : formatted
-			}
-			def springFrameworkVersion = toMajorMinorVersion(versionConstraints["org.springframework:spring-core"])
-			def springSecurityVersion = toMajorMinorVersion(versionConstraints["org.springframework.security:spring-security-core"])
-			def tomcatVersion = "${versionConstraints["org.apache.tomcat:tomcat-annotations-api"]}"
-			def tomcatDocsVersion = tomcatVersion.substring(0, tomcatVersion.lastIndexOf("."));
-			options.links = [
-				"https://docs.oracle.com/en/java/javase/17/docs/api/",
-				"https://docs.spring.io/spring-framework/docs/${springFrameworkVersion}/javadoc-api/",
-				"https://docs.spring.io/spring-security/site/docs/${springSecurityVersion}/api/",
-				"https://jakarta.ee/specifications/platform/9/apidocs/",
-				"https://tomcat.apache.org/tomcat-${tomcatDocsVersion}-doc/api/",
-			] as String[]
-		}
+		doFirst(new ConfigureJavadocLinks(configurations.resolvedBom, ["Spring Framework", "Spring Security", "Tomcat"]))
 	}
 }