diff --git a/src/java/com/threerings/cast/ActionSequence.java b/src/java/com/threerings/cast/ActionSequence.java
index 08393df4e..dae897a36 100644
--- a/src/java/com/threerings/cast/ActionSequence.java
+++ b/src/java/com/threerings/cast/ActionSequence.java
@@ -1,5 +1,5 @@
 //
-// $Id: ActionSequence.java,v 1.5 2002/07/24 22:24:05 mdb Exp $
+// $Id: ActionSequence.java,v 1.6 2002/08/19 22:28:05 mdb Exp $
 
 package com.threerings.cast;
 
@@ -47,4 +47,8 @@ public class ActionSequence implements Serializable
             ", origin=" + origin +
             ", orients=" + (orients == null ? 0 : orients.length) + "]";
     }
+
+    /** Increase this value when object's serialized state is impacted by
+     * a class change (modification of fields, inheritance). */
+    private long serialVersionUID = 1;
 }
diff --git a/src/java/com/threerings/cast/CharacterComponent.java b/src/java/com/threerings/cast/CharacterComponent.java
index 7fef886c0..6642ba073 100644
--- a/src/java/com/threerings/cast/CharacterComponent.java
+++ b/src/java/com/threerings/cast/CharacterComponent.java
@@ -1,5 +1,5 @@
 //
-// $Id: CharacterComponent.java,v 1.6 2002/05/04 19:38:13 mdb Exp $
+// $Id: CharacterComponent.java,v 1.7 2002/08/19 22:28:05 mdb Exp $
 
 package com.threerings.cast;
 
@@ -73,4 +73,8 @@ public class CharacterComponent implements Serializable
 
     /** The entity from which we obtain our animation frames. */
     protected FrameProvider _frameProvider;
+
+    /** Increase this value when object's serialized state is impacted by
+     * a class change (modification of fields, inheritance). */
+    private long serialVersionUID = 1;
 }
diff --git a/src/java/com/threerings/cast/ComponentClass.java b/src/java/com/threerings/cast/ComponentClass.java
index 89c2c1b9a..11f3ce777 100644
--- a/src/java/com/threerings/cast/ComponentClass.java
+++ b/src/java/com/threerings/cast/ComponentClass.java
@@ -1,5 +1,5 @@
 //
-// $Id: ComponentClass.java,v 1.2 2001/11/27 08:09:35 mdb Exp $
+// $Id: ComponentClass.java,v 1.3 2002/08/19 22:28:05 mdb Exp $
 
 package com.threerings.cast;
 
@@ -79,4 +79,8 @@ public class ComponentClass implements Serializable
 	    return (obj == this);
         }
     }
+
+    /** Increase this value when object's serialized state is impacted by
+     * a class change (modification of fields, inheritance). */
+    private long serialVersionUID = 1;
 }
diff --git a/src/java/com/threerings/media/tile/TrimmedTileSet.java b/src/java/com/threerings/media/tile/TrimmedTileSet.java
index 649902afc..252d56130 100644
--- a/src/java/com/threerings/media/tile/TrimmedTileSet.java
+++ b/src/java/com/threerings/media/tile/TrimmedTileSet.java
@@ -1,5 +1,5 @@
 //
-// $Id: TrimmedTileSet.java,v 1.3 2002/06/21 18:44:27 mdb Exp $
+// $Id: TrimmedTileSet.java,v 1.4 2002/08/19 22:28:05 mdb Exp $
 
 package com.threerings.media.tile;
 
@@ -94,4 +94,8 @@ public class TrimmedTileSet extends TileSet
      * within the untrimmed image at which the trimmed image should be
      * rendered. */
     protected Rectangle[] _tbounds;
+
+    /** Increase this value when object's serialized state is impacted by
+     * a class change (modification of fields, inheritance). */
+    private long serialVersionUID = 1;
 }
diff --git a/src/java/com/threerings/media/tile/bundle/TileSetBundle.java b/src/java/com/threerings/media/tile/bundle/TileSetBundle.java
index d42a404f4..dca24a068 100644
--- a/src/java/com/threerings/media/tile/bundle/TileSetBundle.java
+++ b/src/java/com/threerings/media/tile/bundle/TileSetBundle.java
@@ -1,5 +1,5 @@
 //
-// $Id: TileSetBundle.java,v 1.7 2002/06/19 08:28:55 mdb Exp $
+// $Id: TileSetBundle.java,v 1.8 2002/08/19 22:28:05 mdb Exp $
 
 package com.threerings.media.tile.bundle;
 
@@ -120,4 +120,8 @@ public class TileSetBundle extends HashIntMap
 
     /** We use the image manager to decode our images. */
     protected ImageManager _imgr;
+
+    /** Increase this value when object's serialized state is impacted by
+     * a class change (modification of fields, inheritance). */
+    private long serialVersionUID = 1;
  }
diff --git a/src/java/com/threerings/miso/tile/FringeConfiguration.java b/src/java/com/threerings/miso/tile/FringeConfiguration.java
index 268ff7169..62e08c6a5 100644
--- a/src/java/com/threerings/miso/tile/FringeConfiguration.java
+++ b/src/java/com/threerings/miso/tile/FringeConfiguration.java
@@ -1,5 +1,5 @@
 //
-// $Id: FringeConfiguration.java,v 1.11 2002/05/07 00:05:02 mdb Exp $
+// $Id: FringeConfiguration.java,v 1.12 2002/08/19 22:28:05 mdb Exp $
 
 package com.threerings.miso.tile;
 
@@ -129,4 +129,8 @@ public class FringeConfiguration implements Serializable
 
     /** The mapping from base tileset id to fringerecord. */
     protected HashIntMap _frecs = new HashIntMap();
+
+    /** Increase this value when object's serialized state is impacted by
+     * a class change (modification of fields, inheritance). */
+    private long serialVersionUID = 1;
 }