Added Adoptium JDK8 support and updated DistroTestPlugin JDK version used by Gradle (#3324)

Signed-off-by: Andriy Redko <andriy.redko@aiven.io>

buildSrc/src/main/java/org/opensearch/gradle/Jdk.java

@@ -54,7 +54,7 @@ public class Jdk implements Buildable, Iterable<File> {
         Arrays.asList("darwin", "freebsd", "linux", "mac", "windows")
     );
     private static final Pattern VERSION_PATTERN = Pattern.compile("(\\d+)(\\.\\d+\\.\\d+)?\\+(\\d+(?:\\.\\d+)?)(@([a-f0-9]{32}))?");
-    private static final Pattern LEGACY_VERSION_PATTERN = Pattern.compile("(\\d)(u\\d+)\\+(b\\d+?)(@([a-f0-9]{32}))?");
+    private static final Pattern LEGACY_VERSION_PATTERN = Pattern.compile("(\\d)(u\\d+)(?:\\+|\\-)(b\\d+?)(@([a-f0-9]{32}))?");
 
     private final String name;
     private final Configuration configuration;

buildSrc/src/main/java/org/opensearch/gradle/JdkDownloadPlugin.java

@@ -110,6 +110,21 @@ public class JdkDownloadPlugin implements Plugin<Project> {
 
         if (jdk.getVendor().equals(VENDOR_ADOPTIUM)) {
             repoUrl = "https://github.com/adoptium/temurin" + jdk.getMajor() + "-binaries/releases/download/";
+
+            if (jdk.getMajor().equals("8")) {
+                // JDK-8 updates are always suffixed with 'U' (fe OpenJDK8U).
+                artifactPattern = "jdk"
+                    + jdk.getBaseVersion()
+                    + "-"
+                    + jdk.getBuild()
+                    + "/OpenJDK"
+                    + jdk.getMajor()
+                    + "U"
+                    + "-jdk_[classifier]_[module]_hotspot_"
+                    + jdk.getBaseVersion()
+                    + jdk.getBuild()
+                    + ".[ext]";
+            } else {
                 // JDK updates are suffixed with 'U' (fe OpenJDK17U), whereas GA releases are not (fe OpenJDK17).
                 // To distinguish between those, the GA releases have only major version component (fe 17+32),
                 // the updates always have minor/patch components (fe 17.0.1+12), checking for the presence of
@@ -126,6 +141,7 @@ public class JdkDownloadPlugin implements Plugin<Project> {
                     + "_"
                     + jdk.getBuild()
                     + ".[ext]";
+            }
         } else if (jdk.getVendor().equals(VENDOR_ADOPTOPENJDK)) {
             repoUrl = "https://api.adoptopenjdk.net/v3/binary/version/";
             if (jdk.getMajor().equals("8")) {

buildSrc/src/main/java/org/opensearch/gradle/test/DistroTestPlugin.java

@@ -75,8 +75,8 @@ import java.util.function.Supplier;
 import java.util.stream.Stream;
 
 public class DistroTestPlugin implements Plugin<Project> {
-    private static final String SYSTEM_JDK_VERSION = "8u242+b08";
+    private static final String SYSTEM_JDK_VERSION = "11.0.15+10";
-    private static final String SYSTEM_JDK_VENDOR = "adoptopenjdk";
+    private static final String SYSTEM_JDK_VENDOR = "adoptium";
     private static final String GRADLE_JDK_VERSION = "17.0.3+7";
     private static final String GRADLE_JDK_VENDOR = "adoptium";