diff --git a/api/src/test/java/jakarta/mail/util/FactoryFinderTest.java b/api/src/test/java/jakarta/mail/util/FactoryFinderTest.java
index 763bdfd4..6a3ec317 100644
--- a/api/src/test/java/jakarta/mail/util/FactoryFinderTest.java
+++ b/api/src/test/java/jakarta/mail/util/FactoryFinderTest.java
@@ -74,11 +74,14 @@ public void contextClassLoaderIsBootLoader() {
     }
 
     public static class Class1 {
+        public Class1() {}
     }
 
     public static class Class2 extends Class1 {
+        public Class2() {}
     }
 
     public static class Class3 {
+        public Class3() {}
     }
 }