src/java.base/share/classes/java/lang/reflect/Layer.java

*** 244,254 ****
           *
           * @see Module#addOpens
           */
          public Controller addOpens(Module source, String pn, Module target) {
              Objects.requireNonNull(source);
-             Objects.requireNonNull(source);
              Objects.requireNonNull(target);
              ensureInLayer(source);
              Modules.addOpens(source, pn, target);
              return this;
          }
--- 244,253 ----
*** 539,549 ****
       * given function. The class loader delegation implemented by these class
       * loaders must respect module readability. The class loaders should be
       * {@link ClassLoader#registerAsParallelCapable parallel-capable} so as to
       * avoid deadlocks during class loading. In addition, the entity creating
       * a new layer with this method should arrange that the class loaders are
!      * ready to load from these module before there are any attempts to load
       * classes or resources.
       *
       * <p> Creating a {@code Layer} can fail for the following reasons: </p>
       *
       * <ul>
--- 538,548 ----
       * given function. The class loader delegation implemented by these class
       * loaders must respect module readability. The class loaders should be
       * {@link ClassLoader#registerAsParallelCapable parallel-capable} so as to
       * avoid deadlocks during class loading. In addition, the entity creating
       * a new layer with this method should arrange that the class loaders are
!      * ready to load from these modules before there are any attempts to load
       * classes or resources.
       *
       * <p> Creating a {@code Layer} can fail for the following reasons: </p>
       *
       * <ul>