Missing @Override

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@815441 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/collections/BufferOverflowException.java

@@ -70,6 +70,7 @@ public class BufferOverflowException extends RuntimeException {
      *
      * @return the root cause
      */
+    @Override
     public final Throwable getCause() {
         return throwable;
     }

src/java/org/apache/commons/collections/BufferUnderflowException.java

@@ -73,6 +73,7 @@ public class BufferUnderflowException extends NoSuchElementException {
      *
      * @return the root cause
      */
+    @Override
     public final Throwable getCause() {
         return throwable;
     }