Use final

Author: garydgregory

src/test/java/org/apache/commons/lang3/LangAssertions.java

@@ -26,11 +26,11 @@
  */
 public class LangAssertions {
 
-    public static NullPointerException assertNullPointerException(Executable executable) {
+    public static NullPointerException assertNullPointerException(final Executable executable) {
         return assertThrows(NullPointerException.class, executable);
     }
 
-    public static NullPointerException assertNullPointerException(Executable executable, String message) {
+    public static NullPointerException assertNullPointerException(final Executable executable, final String message) {
         return assertThrows(NullPointerException.class, executable, message);
     }
 }