SOLR-17321 JDK 21: delete obsolete checks mostly in build (#2868)

* Build checks
* SSL checks not needed
* Lookup.ensureInitialized

build-tools/missing-doclet/src/main/java/org/apache/lucene/missingdoclet/MissingDoclet.java

@@ -438,13 +438,6 @@ private void error(Element element, String message) {
     fullMessage.append("): ");
     fullMessage.append(message);
 
-    if (Runtime.version().feature() == 11 && element.getKind() == ElementKind.PACKAGE) {
-      // Avoid JDK 11 bug:
-      // https://issues.apache.org/jira/browse/LUCENE-9747
-      // https://bugs.openjdk.java.net/browse/JDK-8224082
-      reporter.print(Diagnostic.Kind.ERROR, fullMessage.toString());
-    } else {
-      reporter.print(Diagnostic.Kind.ERROR, element, fullMessage.toString());
-    }
+    reporter.print(Diagnostic.Kind.ERROR, element, fullMessage.toString());
   }
 }

build.gradle

@@ -133,7 +133,6 @@ apply from: file('gradle/java/javac.gradle')
 apply from: file('gradle/testing/defaults-tests.gradle')
 apply from: file('gradle/testing/randomization.gradle')
 apply from: file('gradle/testing/fail-on-no-tests.gradle')
-apply from: file('gradle/testing/fail-on-unsupported-jdk.gradle')
 apply from: file('gradle/testing/alternative-jdk-support.gradle')
 apply from: file('gradle/java/jar-manifest.gradle')
 apply from: file('gradle/testing/retry-test.gradle')
@@ -206,7 +205,6 @@ apply from: file('gradle/hacks/global-exclude-dependencies.gradle')
 apply from: file('gradle/hacks/gradle-archives.gradle')
 
 apply from: file('gradle/hacks/wipe-temp.gradle')
-apply from: file('gradle/hacks/hashmapAssertions.gradle')
 apply from: file('gradle/hacks/turbocharge-jvm-opts.gradle')
 apply from: file('gradle/hacks/dummy-outputs.gradle')
 

solr/core/src/java/org/apache/solr/servlet/CoreContainerProvider.java

@@ -215,13 +215,12 @@ private void init(ServletContext servletContext) {
       }
 
       // Do initial logs for experimental Lucene classes.
-      // TODO: Use "MethodHandles.lookup().ensureClassInitialized()" instead of "Class.forName()"
-      //   once JDK 15+ is mandatory
+      final var lookup = MethodHandles.lookup();
       Stream.of(MMapDirectory.class, VectorUtil.class)
           .forEach(
               cls -> {
                 try {
-                  Class.forName(cls.getName());
+                  lookup.ensureInitialized(cls);
                 } catch (ReflectiveOperationException re) {
                   throw new SolrException(
                       ErrorCode.SERVER_ERROR, "Could not load Lucene class: " + cls.getName());

solr/test-framework/src/java/org/apache/solr/util/SSLTestConfig.java

@@ -16,7 +16,6 @@
  */
 package org.apache.solr.util;
 
-import com.carrotsearch.randomizedtesting.RandomizedTest;
 import java.security.KeyManagementException;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
@@ -27,7 +26,6 @@
 import java.security.UnrecoverableKeyException;
 import java.util.Random;
 import java.util.concurrent.ThreadLocalRandom;
-import java.util.regex.Pattern;
 import javax.net.ssl.SSLContext;
 import org.apache.http.config.Registry;
 import org.apache.http.config.RegistryBuilder;
@@ -38,7 +36,6 @@
 import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
 import org.apache.http.ssl.SSLContextBuilder;
 import org.apache.http.ssl.SSLContexts;
-import org.apache.lucene.util.Constants;
 import org.apache.solr.client.solrj.embedded.SSLConfig;
 import org.apache.solr.client.solrj.impl.HttpClientUtil;
 import org.apache.solr.client.solrj.impl.HttpClientUtil.SocketFactoryRegistryProvider;
@@ -108,10 +105,6 @@ public SSLTestConfig(boolean useSsl, boolean clientAuth, boolean checkPeerName)
     this.clientAuth = clientAuth;
     this.checkPeerName = checkPeerName;
 
-    if (this.useSsl) {
-      assumeSslIsSafeToTest();
-    }
-
     final String resourceName =
         checkPeerName ? TEST_KEYSTORE_LOCALHOST_RESOURCE : TEST_KEYSTORE_BOGUSHOST_RESOURCE;
     trustStore = keyStore = Resource.newClassPathResource(resourceName);
@@ -414,50 +407,4 @@ public void reseed(SecureRandomParameters params) {
       /* NOOP */
     }
   }
-
-  /**
-   * Helper method for sanity checking if it's safe to use SSL on this JVM
-   *
-   * @see <a href="https://issues.apache.org/jira/browse/SOLR-12988">SOLR-12988</a>
-   * @throws org.junit.internal.AssumptionViolatedException if this JVM is known to have SSL
-   *     problems
-   */
-  public static void assumeSslIsSafeToTest() {
-    if (Constants.JVM_NAME.startsWith("OpenJDK")
-        || Constants.JVM_NAME.startsWith("Java HotSpot(TM)")) {
-      RandomizedTest.assumeFalse(
-          "Test (or randomization for this seed) wants to use SSL, "
-              + "but SSL is known to fail on your JVM: "
-              + Constants.JVM_NAME
-              + " / "
-              + Constants.JVM_VERSION,
-          isOpenJdkJvmVersionKnownToHaveProblems(Constants.JVM_VERSION));
-    }
-  }
-
-  /**
-   * package visibility for tests
-   *
-   * @see Constants#JVM_VERSION
-   * @lucene.internal
-   */
-  static boolean isOpenJdkJvmVersionKnownToHaveProblems(final String jvmVersion) {
-    // TODO: would be nice to replace with Runtime.Version once we don't have to
-    // worry about java8 support when backporting to branch_8x
-    return KNOWN_BAD_OPENJDK_JVMS.matcher(jvmVersion).matches();
-  }
-
-  private static final Pattern KNOWN_BAD_OPENJDK_JVMS =
-      Pattern.compile( // 11 to 11.0.2 were all definitely problematic
-          // - https://bugs.openjdk.java.net/browse/JDK-8212885
-          // - https://bugs.openjdk.java.net/browse/JDK-8213202
-          "(^11(\\.0(\\.0|\\.1|\\.2)?)?($|(\\_|\\+|\\-).*$))|"
-              +
-              // early (pre-ea) "testing" builds of 11, 12, and 13 were also buggy
-              // - https://bugs.openjdk.java.net/browse/JDK-8224829
-              "(^(11|12|13).*-testing.*$)|"
-              +
-              // So far, all 13-ea builds (up to 13-ea-26) have been buggy
-              // - https://bugs.openjdk.java.net/browse/JDK-8226338
-              "(^13-ea.*$)");
 }