Resolve legacy OpenJDK build metadata

__tests__/distributors/openjdk-installer.test.ts

@@ -47,6 +47,8 @@ const archivePage = `
   <a href="https://download.java.net/java/GA/jdk26.0.1/hash/8/GPL/openjdk-26.0.1_linux-x64_bin.tar.gz">tar.gz</a>
   <a href="https://download.java.net/java/GA/jdk25/hash/36/GPL/openjdk-25_linux-x64_bin.tar.gz">tar.gz</a>
   <a href="https://download.java.net/java/GA/jdk18.0.1.1/hash/2/GPL/openjdk-18.0.1.1_linux-x64_bin.tar.gz">tar.gz</a>
+  <th>9.0.4 (build 9.0.4+11)</th>
+  <a href="https://download.java.net/java/GA/jdk9/9.0.4/binaries/openjdk-9.0.4_linux-x64_bin.tar.gz">tar.gz</a>
 `;
 
 function createDistribution(
@@ -111,6 +113,16 @@ describe('OpenJdkDistribution', () => {
     expect(result.version).toBe('26.0.2+10');
   });
 
+  it('resolves an exact build from a legacy archive heading', async () => {
+    const result =
+      await createDistribution('9.0.4+11')['findPackageForDownload'](
+        '9.0.4+11'
+      );
+
+    expect(result.version).toBe('9.0.4+11');
+    expect(result.url).toContain('/binaries/openjdk-9.0.4_linux-x64_bin');
+  });
+
   it('resolves a four-field Java version', async () => {
     const result =
       await createDistribution('18.0.1.1')['findPackageForDownload'](

dist/setup/index.js

@@ -131939,13 +131939,23 @@ class OpenJdkDistribution extends JavaBase {
         const pattern = new RegExp(`href="(https://download\\.java\\.net/[^"]+/openjdk-([^"_]+)_${platformPattern}-${arch}_bin\\.${extensionPattern})"`, 'g');
         return Array.from(html.matchAll(pattern), match => {
             const url = match[1];
-            const build = url.match(/\/(\d+)\/(?:GPL\/)?openjdk-/)?.[1];
+            const build = url.match(/\/(\d+)\/(?:GPL\/)?openjdk-/)?.[1] ??
+                this.findBuildInArchiveHeading(html, match.index, match[2]);
             return {
                 version: this.toSemver(match[2], build),
                 url
             };
         });
     }
+    findBuildInArchiveHeading(html, assetIndex, version) {
+        const headings = Array.from(html.slice(0, assetIndex).matchAll(/\(build\s+([^)]+)\)/g));
+        const headingVersion = headings.at(-1)?.[1];
+        if (!headingVersion) {
+            return undefined;
+        }
+        const [javaVersion, build] = headingVersion.split('+');
+        return javaVersion === version ? build : undefined;
+    }
     toSemver(version, urlBuild) {
         const [javaVersion, filenameBuild] = version.replace('-ea', '').split('+');
         const versionParts = javaVersion.split('.');

src/distributions/openjdk/installer.ts

@@ -126,7 +126,9 @@ export class OpenJdkDistribution extends JavaBase {
 
     return Array.from(html.matchAll(pattern), match => {
       const url = match[1];
-      const build = url.match(/\/(\d+)\/(?:GPL\/)?openjdk-/)?.[1];
+      const build =
+        url.match(/\/(\d+)\/(?:GPL\/)?openjdk-/)?.[1] ??
+        this.findBuildInArchiveHeading(html, match.index, match[2]);
       return {
         version: this.toSemver(match[2], build),
         url
@@ -134,6 +136,23 @@ export class OpenJdkDistribution extends JavaBase {
     });
   }
 
+  private findBuildInArchiveHeading(
+    html: string,
+    assetIndex: number,
+    version: string
+  ): string | undefined {
+    const headings = Array.from(
+      html.slice(0, assetIndex).matchAll(/\(build\s+([^)]+)\)/g)
+    );
+    const headingVersion = headings.at(-1)?.[1];
+    if (!headingVersion) {
+      return undefined;
+    }
+
+    const [javaVersion, build] = headingVersion.split('+');
+    return javaVersion === version ? build : undefined;
+  }
+
   private toSemver(version: string, urlBuild?: string): string {
     const [javaVersion, filenameBuild] = version.replace('-ea', '').split('+');
     const versionParts = javaVersion.split('.');