src/java.desktop/share/classes/javax/imageio/spi/DigraphNode.java

@@ -41,25 +41,28 @@
  */
 class DigraphNode<E> implements Cloneable, Serializable {
     private static final long serialVersionUID = 5308261378582246841L;
 
     /** The data associated with this node. */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     protected E data;
 
     /**
      * A {@code Set} of neighboring nodes pointed to by this
      * node.
      */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     protected Set<DigraphNode<E>> outNodes = new HashSet<>();
 
     /** The in-degree of the node. */
     protected int inDegree = 0;
 
     /**
      * A {@code Set} of neighboring nodes that point to this
      * node.
      */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private Set<DigraphNode<E>> inNodes = new HashSet<>();
 
     public DigraphNode(E data) {
         this.data = data;
     }