Minor cleanup

src/main/java/org/bukkit/event/entity/EntityCreatePortalEvent.java

@@ -10,6 +10,7 @@ import org.bukkit.event.HandlerList;
 /**
  * Thrown when a Living Entity creates a portal in a world.
  */
+@SuppressWarnings("serial")
 public class EntityCreatePortalEvent extends EntityEvent implements Cancellable {
     private static final HandlerList handlers = new HandlerList();
     private List<BlockState> blocks;

src/main/java/org/bukkit/event/entity/ItemDespawnEvent.java

@@ -5,6 +5,7 @@ import org.bukkit.entity.Entity;
 import org.bukkit.event.Cancellable;
 import org.bukkit.event.HandlerList;
 
+@SuppressWarnings("serial")
 public class ItemDespawnEvent extends EntityEvent implements Cancellable {
     private static final HandlerList handlers = new HandlerList();
     private boolean canceled;