Summary

Fix the signature of the return type StandardDoclet.getSupportedOptions to include a missing wildcard.

Problem

The signature of Doclet.getSupportedOptions uses a wildcard in the return type.

Set<? extends Doclet.Option> getSupportedOptions() 

There is an overriding method in StandardDoclet, but it incorrectly omits the wildcard, this forcing a more restrictive return type.

public Set<Doclet.Option> getSupportedOptions() 

Solution

Fix the return type.

Specification

diff -r 20cb5d43dc2d src/jdk.javadoc/share/classes/jdk/javadoc/doclet/StandardDoclet.java
--- a/src/jdk.javadoc/share/classes/jdk/javadoc/doclet/StandardDoclet.java Wed Jan 22 14:27:13 2020 -0500
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/doclet/StandardDoclet.java Wed Jan 22 11:54:40 2020 -0800
@@ -85,7 +85,7 @@
     }

     @Override
-    public Set<Doclet.Option> getSupportedOptions() {
+    public Set<? extends Doclet.Option> getSupportedOptions() {
         return htmlDoclet.getSupportedOptions();
     }