8285496: DocLint does not check for missing @param tags for type parameters on classes and interfaces

Reviewed-by: darcy, iris

Author: jonathan-gibbons

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclint/Checker.java

@@ -251,7 +251,7 @@ public Void scan(DocCommentTree tree, TreePath p) {
         // the following checks are made after the scan, which will record @param tags
         if (isDeclaredType()) {
             TypeElement te = (TypeElement) env.currElement;
-            // checkParamsDocumented(te.getTypeParameters()); // See JDK-8285496
+            checkParamsDocumented(te.getTypeParameters());
             checkParamsDocumented(te.getRecordComponents());
         } else if (isExecutable()) {
             if (!isOverridingMethod) {

test/langtools/tools/doclint/MissingParamsTest.java

@@ -1,6 +1,6 @@
 /*
  * @test /nodynamiccopyright/
- * @bug 8004832
+ * @bug 8004832 8285496
  * @summary Add new doclint package
  * @modules jdk.javadoc/jdk.javadoc.internal.doclint
  * @build DocLintTester
@@ -21,4 +21,7 @@ void missingParam(int param) { }
 
     /** . */
     <T> void missingTyparam() { }
+
+    /** . */
+    public class MissingTyparam<T> { /** . */ MissingTyparam() { } }
 }

test/langtools/tools/doclint/MissingParamsTest.out

@@ -10,5 +10,8 @@ MissingParamsTest.java:20: warning: no @param for param
 MissingParamsTest.java:23: warning: no @param for <T>
     <T> void missingTyparam() { }
              ^
-4 warnings
+MissingParamsTest.java:26: warning: no @param for <T>
+    public class MissingTyparam<T> { /** . */ MissingTyparam() { } }
+           ^
+5 warnings