HADOOP-19785. mvn site fails in JDK17

hadoop-common-project/hadoop-annotations/pom.xml

@@ -42,10 +42,16 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <configuration>
+        <!-- override the parent config to use source and target
+             instead of release to use JDK internal API -->
+        <configuration combine.self="override">
+          <source>${javac.version}</source>
+          <target>${javac.version}</target>
           <compilerArgs>
             <arg>--add-modules</arg>
             <arg>jdk.javadoc</arg>
+            <arg>--add-exports</arg>
+            <arg>jdk.javadoc/jdk.javadoc.internal.tool=ALL-UNNAMED</arg>
           </compilerArgs>
         </configuration>
       </plugin>

hadoop-common-project/hadoop-annotations/src/main/java/org/apache/hadoop/classification/tools/HadoopDocEnvImpl.java

@@ -0,0 +1,173 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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
+ *
+ *     http://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.apache.hadoop.classification.tools;
+
+import com.sun.source.util.DocTrees;
+import jdk.javadoc.doclet.DocletEnvironment;
+import jdk.javadoc.internal.tool.DocEnvImpl;
+import jdk.javadoc.internal.tool.ToolEnvironment;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+
+import javax.lang.model.SourceVersion;
+import javax.lang.model.element.AnnotationMirror;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.ElementKind;
+import javax.lang.model.element.TypeElement;
+import javax.lang.model.util.Elements;
+import javax.lang.model.util.Types;
+import javax.tools.JavaFileManager;
+import javax.tools.JavaFileObject;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * This class extends Java internal DocEnvImpl to avoid cast error while
+ * migrating to JDK17. It filters elements based on Hadoop's InterfaceAudience
+ * and InterfaceStability annotations.
+ * This class depends on JDK internal implementation, so we might need to
+ * update the source code when upgrading to upper JDK versions.
+ */
+public class HadoopDocEnvImpl extends DocEnvImpl {
+
+  private final DocletEnvironment delegate;
+  private final String stability;
+  private final boolean treatUnannotatedClassesAsPrivate;
+
+  public HadoopDocEnvImpl(DocletEnvironment original, String stability,
+      boolean treatUnannotatedClassesAsPrivate) {
+    super(extractToolEnvironment(original), null);
+    this.delegate = original;
+    this.stability = stability;
+    this.treatUnannotatedClassesAsPrivate = treatUnannotatedClassesAsPrivate;
+  }
+
+  // Use original ToolEnvironment to avoid NullPointerException
+  private static ToolEnvironment extractToolEnvironment(DocletEnvironment original) {
+    if (original instanceof DocEnvImpl impl) {
+      return impl.toolEnv;
+    }
+    throw new IllegalArgumentException(
+        "Expected DocEnvImpl but got: " + original.getClass().getName());
+  }
+
+  private boolean exclude(Element el) {
+    boolean sawPublic = false;
+
+    for (AnnotationMirror am : el.getAnnotationMirrors()) {
+      final String qname = am.getAnnotationType().toString();
+
+      if (qname.equals(InterfaceAudience.Private.class.getCanonicalName()) || qname.equals(
+          InterfaceAudience.LimitedPrivate.class.getCanonicalName())) {
+        return true;
+      }
+
+      if (stability.equals(StabilityOptions.EVOLVING_OPTION)) {
+        if (qname.equals(InterfaceStability.Unstable.class.getCanonicalName())) {
+          return true;
+        }
+      }
+      if (stability.equals(StabilityOptions.STABLE_OPTION)) {
+        if (qname.equals(InterfaceStability.Unstable.class.getCanonicalName()) || qname.equals(
+            InterfaceStability.Evolving.class.getCanonicalName())) {
+          return true;
+        }
+      }
+
+      if (qname.equals(InterfaceAudience.Public.class.getCanonicalName())) {
+        sawPublic = true;
+      }
+    }
+
+    if (sawPublic) {
+      return false;
+    }
+
+    if (treatUnannotatedClassesAsPrivate) {
+      ElementKind k = el.getKind();
+      if (k == ElementKind.CLASS || k == ElementKind.INTERFACE
+          || k == ElementKind.ANNOTATION_TYPE) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+  @Override
+  public Set<? extends Element> getSpecifiedElements() {
+    Set<? extends Element> base = delegate.getSpecifiedElements();
+    return base.stream().filter(e -> !exclude(e))
+        .collect(Collectors.toCollection(LinkedHashSet::new));
+  }
+
+  @Override
+  public Set<? extends Element> getIncludedElements() {
+    Set<? extends Element> base = delegate.getIncludedElements();
+    return base.stream().filter(e -> !exclude(e))
+        .collect(Collectors.toCollection(LinkedHashSet::new));
+  }
+
+  @Override
+  public DocTrees getDocTrees() {
+    return delegate.getDocTrees();
+  }
+
+  @Override
+  public Elements getElementUtils() {
+    return delegate.getElementUtils();
+  }
+
+  @Override
+  public Types getTypeUtils() {
+    return delegate.getTypeUtils();
+  }
+
+  @Override
+  public boolean isIncluded(Element e) {
+    boolean base = delegate.isIncluded(e);
+    return base && !exclude(e);
+  }
+
+  @Override
+  public boolean isSelected(Element e) {
+    return delegate.isSelected(e);
+  }
+
+  @Override
+  public JavaFileManager getJavaFileManager() {
+    return delegate.getJavaFileManager();
+  }
+
+  @Override
+  public SourceVersion getSourceVersion() {
+    return delegate.getSourceVersion();
+  }
+
+  @Override
+  public DocletEnvironment.ModuleMode getModuleMode() {
+    return delegate.getModuleMode();
+  }
+
+  @Override
+  public JavaFileObject.Kind getFileKind(TypeElement type) {
+    return delegate.getFileKind(type);
+  }
+}