src/share/classes/java/lang/Thread.java

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@@ -1849,10 +1849,11 @@
      * @see #setDefaultUncaughtExceptionHandler
      * @see #setUncaughtExceptionHandler
      * @see ThreadGroup#uncaughtException
      * @since 1.5
      */
+    @FunctionalInterface
     public interface UncaughtExceptionHandler {
         /**
          * Method invoked when the given thread terminates due to the
          * given uncaught exception.
          * <p>Any exception thrown by this method will be ignored by the