8270866: NPE in DocTreePath.getTreePath()

Reviewed-by: jjg

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/AbstractMemberWriter.java

@@ -335,7 +335,7 @@ protected void addUseInfo(List<? extends Element> members, Content heading, Cont
                     : HtmlLinkInfo.Kind.MEMBER,
                     te, element, typeContent);
             Content desc = new ContentBuilder();
-            writer.addSummaryLinkComment(this, element, desc);
+            writer.addSummaryLinkComment(element, desc);
             useTable.addRow(summaryType, typeContent, desc);
         }
         contentTree.add(useTable);
@@ -363,7 +363,7 @@ public void addMemberSummary(TypeElement tElement, Element member,
         addSummaryLink(tElement, member, summaryLink);
         rowContents.add(summaryLink);
         Content desc = new ContentBuilder();
-        writer.addSummaryLinkComment(this, member, firstSentenceTrees, desc);
+        writer.addSummaryLinkComment(member, firstSentenceTrees, desc);
         rowContents.add(desc);
         table.addRow(member, rowContents);
     }

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/HtmlDocletWriter.java

@@ -1162,7 +1162,7 @@ private Content plainOrCode(boolean plain, Content body) {
     public void addInlineComment(Element element, DocTree tag, Content htmltree) {
         CommentHelper ch = utils.getCommentHelper(element);
         List<? extends DocTree> description = ch.getDescription(tag);
-        addCommentTags(element, tag, description, false, false, false, htmltree);
+        addCommentTags(element, description, false, false, false, htmltree);
     }
 
     /**
@@ -1249,22 +1249,6 @@ public void addInlineComment(Element element, Content htmltree) {
      */
     private void addCommentTags(Element element, List<? extends DocTree> tags, boolean depr,
             boolean first, boolean inSummary, Content htmltree) {
-        addCommentTags(element, null, tags, depr, first, inSummary, htmltree);
-    }
-
-    /**
-     * Adds the comment tags.
-     *
-     * @param element for which the comment tags will be generated
-     * @param holderTag the block tag context for the inline tags
-     * @param tags the first sentence tags for the doc
-     * @param depr true if it is deprecated
-     * @param first true if the first sentence tags should be added
-     * @param inSummary true if the comment tags are added into the summary section
-     * @param htmltree the documentation tree to which the comment tags will be added
-     */
-    private void addCommentTags(Element element, DocTree holderTag, List<? extends DocTree> tags, boolean depr,
-            boolean first, boolean inSummary, Content htmltree) {
         if (options.noComment()) {
             return;
         }

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/SubWriterHolderWriter.java

@@ -38,7 +38,6 @@
 import jdk.javadoc.internal.doclets.formats.html.markup.HtmlStyle;
 import jdk.javadoc.internal.doclets.formats.html.markup.TagName;
 import jdk.javadoc.internal.doclets.formats.html.markup.HtmlTree;
-import jdk.javadoc.internal.doclets.formats.html.markup.RawHtml;
 import jdk.javadoc.internal.doclets.toolkit.Content;
 import jdk.javadoc.internal.doclets.toolkit.util.DocPath;
 
@@ -136,25 +135,22 @@ protected void addIndexComment(Element member, List<? extends DocTree> firstSent
     /**
      * Add the summary link for the member.
      *
-     * @param mw the writer for the member being documented
      * @param member the member to be documented
      * @param contentTree the content tree to which the link will be added
      */
-    public void addSummaryLinkComment(AbstractMemberWriter mw, Element member, Content contentTree) {
+    public void addSummaryLinkComment(Element member, Content contentTree) {
         List<? extends DocTree> tags = utils.getFirstSentenceTrees(member);
-        addSummaryLinkComment(mw, member, tags, contentTree);
+        addSummaryLinkComment(member, tags, contentTree);
     }
 
     /**
      * Add the summary link comment.
      *
-     * @param mw the writer for the member being documented
      * @param member the member being documented
      * @param firstSentenceTags the first sentence tags for the member to be documented
      * @param tdSummary the content tree to which the comment will be added
      */
-    public void addSummaryLinkComment(AbstractMemberWriter mw,
-            Element member, List<? extends DocTree> firstSentenceTags, Content tdSummary) {
+    public void addSummaryLinkComment(Element member, List<? extends DocTree> firstSentenceTags, Content tdSummary) {
         addIndexComment(member, firstSentenceTags, tdSummary);
     }
 

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/taglets/InheritDocTaglet.java

@@ -97,7 +97,6 @@ private Content retrieveInheritedDocumentation(TagletWriter writer,
             if (!inheritedDoc.inlineTags.isEmpty()) {
                 replacement = writer.commentTagsToOutput(inheritedDoc.holder, inheritedDoc.holderTag,
                     inheritedDoc.inlineTags, isFirstSentence);
-                ch.setOverrideElement(inheritedDoc.holder);
             }
 
         } else {

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/taglets/ParamTaglet.java

@@ -206,9 +206,7 @@ private Content getInheritedTagletOutput(ParamKind kind, Element holder,
                     String lname = kind != ParamKind.TYPE_PARAMETER
                             ? utils.getSimpleName(e)
                             : utils.getTypeName(e.asType(), false);
-                    CommentHelper ch = utils.getCommentHelper(holder);
-                    ch.setOverrideElement(inheritedDoc.holder);
-                    Content content = processParamTag(holder, kind, writer,
+                    Content content = processParamTag(inheritedDoc.holder, kind, writer,
                             (ParamTree) inheritedDoc.holderTag,
                             lname,
                             alreadyDocumented.isEmpty());

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/taglets/ReturnTaglet.java

@@ -121,9 +121,7 @@ public Content getAllBlockTagOutput(Element holder, TagletWriter writer) {
         Input input = new DocFinder.Input(utils, holder, this);
         DocFinder.Output inheritedDoc = DocFinder.search(writer.configuration(), input);
         if (inheritedDoc.holderTag != null) {
-            CommentHelper ch = utils.getCommentHelper(input.element);
-            ch.setOverrideElement(inheritedDoc.holder);
-            return writer.returnTagOutput(holder, (ReturnTree) inheritedDoc.holderTag, false);
+            return writer.returnTagOutput(inheritedDoc.holder, (ReturnTree) inheritedDoc.holderTag, false);
         }
         return null;
     }

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/util/CommentHelper.java

@@ -165,37 +165,16 @@ Element getElement(ReferenceTree rtree) {
             }
             return configuration.docEnv.getTypeUtils().asElement(symbol);
         }
-        // case A: the element contains no comments associated and
-        // the comments need to be copied from ancestor
-        // case B: the element has @inheritDoc, then the ancestral comment
-        // as appropriate has to be copied over.
-
-        // Case A.
-        if (dcTree == null && overriddenElement != null) {
-            CommentHelper ovch = utils.getCommentHelper(overriddenElement);
-            return ovch.getElement(rtree);
-        }
-        if (dcTree == null) {
-            return null;
-        }
-        DocTreePath docTreePath = DocTreePath.getPath(path, dcTree, rtree);
+        DocTreePath docTreePath = getDocTreePath(rtree);
         if (docTreePath == null) {
-            // Case B.
-            if (overriddenElement != null) {
-                CommentHelper ovch = utils.getCommentHelper(overriddenElement);
-                return ovch.getElement(rtree);
-            }
             return null;
         }
         DocTrees doctrees = configuration.docEnv.getDocTrees();
         return doctrees.getElement(docTreePath);
     }
 
     public TypeMirror getType(ReferenceTree rtree) {
-        // Workaround for JDK-8269706
-        if (path == null || dcTree == null || rtree == null)
-            return null;
-        DocTreePath docTreePath = DocTreePath.getPath(path, dcTree, rtree);
+        DocTreePath docTreePath = getDocTreePath(rtree);
         if (docTreePath != null) {
             DocTrees doctrees = configuration.docEnv.getDocTrees();
             return doctrees.getType(docTreePath);
@@ -700,9 +679,18 @@ public ReferenceTree getType(DocTree dtree) {
     }
 
     public DocTreePath getDocTreePath(DocTree dtree) {
-        if (path == null || dcTree == null || dtree == null)
+        if (dcTree == null && overriddenElement != null) {
+            // This is an inherited comment, return path from ancestor.
+            return configuration.utils.getCommentHelper(overriddenElement).getDocTreePath(dtree);
+        } else if (path == null || dcTree == null || dtree == null) {
             return null;
-        return DocTreePath.getPath(path, dcTree, dtree);
+        }
+        DocTreePath dtPath = DocTreePath.getPath(path, dcTree, dtree);
+        if (dtPath == null && overriddenElement != null) {
+            // The overriding element has a doc tree, but it doesn't contain what we're looking for.
+            return configuration.utils.getCommentHelper(overriddenElement).getDocTreePath(dtree);
+        }
+        return dtPath;
     }
 
     public Element getOverriddenElement() {

test/langtools/jdk/javadoc/doclet/testInherited/TestInherited.java

@@ -23,7 +23,7 @@
 
 /*
  * @test
- * @bug 8269722
+ * @bug 8269722 8270866
  * @summary NPE in HtmlDocletWriter, reporting errors on inherited tags
  * @library /tools/lib ../../lib
  * @modules jdk.javadoc/jdk.javadoc.internal.tool
@@ -67,6 +67,14 @@ public void m(int i) { }
                 "-Xdoclint:-missing", "-XDdoe",
                 src.resolve("BadParam.java").toString());
         checkExit(Exit.OK);
+        checkOutput("BadParam.Base.html", true, """
+                <dt>Parameters:</dt>
+                <dd><code>i</code> - a &lt; b</dd>
+                """);
+        checkOutput("BadParam.Sub.html", true, """
+                <dt>Parameters:</dt>
+                <dd><code>i</code> - a &lt; b</dd>
+                """);
     }
 
     @Test
@@ -91,5 +99,64 @@ public int m() { }
                 "-Xdoclint:-missing",
                 src.resolve("BadReturn.java").toString());
         checkExit(Exit.OK);
+        checkOutput("BadReturn.Base.html", true, """
+                <dt>Returns:</dt>
+                <dd>a &lt; b</dd>
+                """);
+        checkOutput("BadReturn.Sub.html", true, """
+                <dt>Returns:</dt>
+                <dd>a &lt; b</dd>
+                """);
+    }
+
+    @Test
+    public void testBadInheritedReference(Path base) throws Exception {
+        Path src = base.resolve("src");
+        tb.writeJavaFiles(src, """
+                public class BadReference {
+                    public interface Intf {
+                        /**
+                         * {@link NonExistingClass}
+                         */
+                        public void m();
+                    }
+
+                    public static class Impl1 implements Intf {
+                        public void m() { }
+                    }
+
+                    public static class Impl2 implements Intf {
+                        /**
+                         * {@inheritDoc}
+                         */
+                        public void m() { }
+                    }
+
+                    // subclass has doc comment but inherits main description
+                    public static class Impl3 implements Intf {
+                        /**
+                         * @since 1
+                         */
+                        public void m() { }
+                    }
+                }
+                """);
+
+        javadoc("-d", base.resolve("out").toString(),
+                "-Xdoclint:-reference",
+                src.resolve("BadReference.java").toString());
+        checkExit(Exit.OK);
+        checkOutput("BadReference.Intf.html", true, """
+                <div class="block"><code>NonExistingClass</code></div>
+                """);
+        checkOutput("BadReference.Impl1.html", true, """
+                <div class="block"><code>NonExistingClass</code></div>
+                """);
+        checkOutput("BadReference.Impl2.html", true, """
+                <div class="block"><code>NonExistingClass</code></div>
+                """);
+        checkOutput("BadReference.Impl3.html", true, """
+                <div class="block"><code>NonExistingClass</code></div>
+                """);
     }
-}
+}