src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/linker/JavaSuperAdapter.java

@@ -23,20 +23,22 @@
  * questions.
  */
 
 package jdk.nashorn.internal.runtime.linker;
 
+import java.util.Objects;
+
 /**
  * Represents a an adapter for invoking superclass methods on an adapter instance generated by
  * {@code JavaAdapterBytecodeGenerator}. Note that objects of this class are just wrappers around the adapter instances,
  * without any behavior. All the behavior is defined in the {@code JavaSuperAdapterLinker}.
  */
 class JavaSuperAdapter {
     private final Object adapter;
 
     JavaSuperAdapter(final Object adapter) {
-        adapter.getClass(); // NPE check
+        Objects.requireNonNull(adapter);
         this.adapter = adapter;
     }
 
     public Object getAdapter() {
         return adapter;