fix: Inherit formal javadoc type parameters (#5869)

spoon-javadoc/src/main/java/spoon/javadoc/api/parsing/InheritanceResolver.java

@@ -146,6 +146,10 @@ public List<JavadocElement> completeJavadocWithInheritedTags(CtElement element,
 			.stream()
 			.map(CtNamedElement::getSimpleName)
 			.collect(Collectors.toCollection(LinkedHashSet::new)); // keep decl order
+		method.getFormalCtTypeParameters()
+			.stream()
+			.map(it -> "<" + it.getSimpleName() + ">")
+			.forEach(paramsToFind::add);
 		view.getBlockTagArguments(StandardJavadocTagType.PARAM, JavadocText.class)
 			.forEach(it -> paramsToFind.remove(it.getText()));
 
@@ -161,7 +165,7 @@ public List<JavadocElement> completeJavadocWithInheritedTags(CtElement element,
 		boolean needsReturn = needsReturn(view);
 		boolean needsBody = view.getBody().isEmpty();
 
-		InheritedJavadoc inheritedJavadoc = lookupInheritedDocForMethod(method);
+		InheritedJavadoc inheritedJavadoc = lookupInheritedDocForMethod(method, paramsToFind, throwsToFind);
 
 		// Order by body -> param -> return -> throws
 		List<JavadocElement> newElements = new ArrayList<>();
@@ -204,12 +208,18 @@ private static boolean needsReturn(JavadocCommentView view) {
 		return start.getTagType() != StandardJavadocTagType.RETURN;
 	}
 
-	private static InheritedJavadoc lookupInheritedDocForMethod(CtMethod<?> method) {
+	private static InheritedJavadoc lookupInheritedDocForMethod(
+		CtMethod<?> method,
+		Set<String> paramsToFind,
+		Set<String> throwsToFind
+	) {
 		List<CtMethod<?>> targets = new InheritanceResolver()
 			.findSuperMethodsInCommentInheritanceOrder(method.getDeclaringType(), method);
 
 		List<JavadocElement> body = new ArrayList<>();
-		JavadocInheritanceCollectionVisitor visitor = new JavadocInheritanceCollectionVisitor(method);
+		JavadocInheritanceCollectionVisitor visitor = new JavadocInheritanceCollectionVisitor(
+			paramsToFind, throwsToFind
+		);
 
 		for (CtMethod<?> target : targets) {
 			if (visitor.isFinished() && !body.isEmpty()) {
@@ -277,14 +287,9 @@ private static class JavadocInheritanceCollectionVisitor implements JavadocVisit
 		private final Map<String, JavadocBlockTag> throwsClauses;
 		private JavadocBlockTag returnTag;
 
-		public JavadocInheritanceCollectionVisitor(CtMethod<?> method) {
-			this.missingParameters = method.getParameters().stream()
-				.map(CtNamedElement::getSimpleName)
-				.collect(Collectors.toCollection(HashSet::new));
-			this.missingThrowsClauses = method.getThrownTypes().stream()
-				.map(CtTypeInformation::getQualifiedName)
-				.collect(Collectors.toCollection(HashSet::new));
-
+		public JavadocInheritanceCollectionVisitor(Set<String> missingParameters, Set<String> missingThrowsClauses) {
+			this.missingParameters = new HashSet<>(missingParameters);
+			this.missingThrowsClauses = new HashSet<>(missingThrowsClauses);
 			this.returnTag = null;
 			this.params = new HashMap<>();
 			this.throwsClauses = new HashMap<>();

spoon-javadoc/src/test/java/spoon/javadoc/api/parsing/InheritanceResolverTest.java

@@ -152,7 +152,7 @@ private static CompletedDoc inheritTestFromSuper(String javadoc) {
 				public static class Sub extends Super {
 				%s
 				@Override
-				public int test(int a) throws IOException { return a; }
+				public <T> int test(int a) throws IOException { return a; }
 				}
 				""".formatted(packageName, InheritanceResolverTest.class.getName() + ".Super", javadoc),
 			subclassName.replace(".", "/")
@@ -179,10 +179,11 @@ static class Super {
 		 * This is a foo method.
 		 *
 		 * @param a the a param
+		 * @param <T> a type param
 		 * @return foo
 		 * @throws IOException never.
 		 */
-		public int test(int a) throws IOException {
+		public <T> int test(int a) throws IOException {
 			return a;
 		}
 	}
@@ -191,15 +192,15 @@ private interface SuperInt1 {
 		/**
 		 * A test.
 		 */
-		int test(int a) throws IOException;
+		<T> int test(int a) throws IOException;
 	}
 
 	private interface SuperInt2 extends SuperInt1 {
 		/**
 		 * @param a the a param
 		 */
 		@Override
-		int test(int a) throws IOException;
+		<T> int test(int a) throws IOException;
 	}
 
 	private interface SuperInt3 {
@@ -208,21 +209,21 @@ private interface SuperInt3 {
 		 *
 		 * @throws IOException never
 		 */
-		int test(int a) throws IOException;
+		<T> int test(int a) throws IOException;
 	}
 
 	private interface SuperInt4 {
 		/**
 		 * @return foo
 		 */
-		int test(int a) throws IOException;
+		<T> int test(int a) throws IOException;
 	}
 
 	private static class SubMultiSuperParent {
 		/**
 		 * Never used in <22, shadowed by the interface.
 		 */
-		public int test(int a) throws IOException {
+		public <T> int test(int a) throws IOException {
 			return 0;
 		}
 	}