garydgregory commented on code in PR #1328:
URL: https://github.com/apache/commons-lang/pull/1328#discussion_r1872030406


##########
src/test/java/org/apache/commons/lang3/builder/ToStringBuilderTest.java:
##########
@@ -229,21 +230,33 @@ public void assertReflectionArray(final String expected, 
final Object actual) {
      */
     @Test
     public void test_setUpToClass_invalid() {
-        final Integer val = Integer.valueOf(5);
+        final HirAFixture val = new HirAFixture();
         final ReflectionToStringBuilder test = new 
ReflectionToStringBuilder(val);
         assertThrows(IllegalArgumentException.class, () -> 
test.setUpToClass(String.class));
         test.toString();
     }
 
+    private static class HirAFixture extends HirBFixture {
+        int x = 1;
+    }
+
+    private static class HirBFixture extends HirCFixture {
+        int y = 2;
+    }
+
+    private static class HirCFixture {

Review Comment:
   That's not what I'm saying ;-) What I'm trying to say is that the check 
_cannot_ use _any_ interfaces. It doesn't matter that the _builds_ needs JPMS 
opens, what matters is how many hoops we want to jump through for the _runtime_ 
to avoid opens, and for that, I claim we can only check for classes, never 
interfaces. The fact that the build uses opens makes it obvious to users that 
they'll need them as well at runtime. Presumably, depending on the app, this is 
something that would show up in the app's unit tests.
   



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