diff --git a/src/java/com/threerings/getdown/data/Application.java b/src/java/com/threerings/getdown/data/Application.java
index 967f9ad..254cac2 100644
--- a/src/java/com/threerings/getdown/data/Application.java
+++ b/src/java/com/threerings/getdown/data/Application.java
@@ -24,7 +24,6 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 
-import com.samskivert.io.NestableIOException;
 import com.samskivert.io.StreamUtil;
 import com.samskivert.text.MessageUtil;
 import com.samskivert.util.RunAnywhere;
@@ -217,7 +216,7 @@ public class Application
                 _version = Long.parseLong(vstr);
             } catch (Exception e) {
                 String err = MessageUtil.tcompose("m.invalid_version", vstr);
-                throw new NestableIOException(err, e);
+                throw (IOException) new IOException(err).initCause(e);
             }
         }
 
@@ -230,7 +229,7 @@ public class Application
             }
         } catch (MalformedURLException mue) {
             String err = MessageUtil.tcompose("m.invalid_appbase", _appbase);
-            throw new NestableIOException(err, mue);
+            throw new (IOException) IOException(err).initCause(mue);
         }
 
         String prefix = (_appid == null) ? "" : (_appid + ".");
@@ -370,7 +369,7 @@ public class Application
             _vappbase = createVAppBase(_targetVersion);
         } catch (MalformedURLException mue) {
             String err = MessageUtil.tcompose("m.invalid_appbase", _appbase);
-            throw new NestableIOException(err, mue);
+            throw (IOException) new IOException(err).initCause(mue);
         }
 
         // now re-download our control files; we download the digest first
@@ -668,7 +667,8 @@ public class Application
             Log.warning("Requested to download invalid control file " +
                         "[appbase=" + _vappbase + ", path=" + path +
                         ", error=" + e + "].");
-            throw new NestableIOException("Invalid path '" + path + "'.", e);
+            String msg = "Invalid path '" + path + "'.";
+            throw (IOException) new IOException(msg).initCause(e);
         }
 
         Log.info("Attempting to refetch '" + path + "' from '" +
diff --git a/src/java/com/threerings/getdown/data/Digest.java b/src/java/com/threerings/getdown/data/Digest.java
index 7c30b47..7599151 100644
--- a/src/java/com/threerings/getdown/data/Digest.java
+++ b/src/java/com/threerings/getdown/data/Digest.java
@@ -1,5 +1,5 @@
 //
-// $Id: Digest.java,v 1.8 2004/08/04 18:43:27 mdb Exp $
+// $Id$
 
 package com.threerings.getdown.data;
 
@@ -16,7 +16,6 @@ import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 
-import com.samskivert.io.NestableIOException;
 import com.samskivert.text.MessageUtil;
 import com.samskivert.util.StringUtil;
 
@@ -120,8 +119,8 @@ public class Digest
                 note(data, path, digest);
                 pout.println(path + " = " + digest);
             } catch (Throwable t) {
-                throw new NestableIOException(
-                    "Error computing digest for: " + rsrc, t);
+                throw (IOException) new IOException(
+                    "Error computing digest for: " + rsrc).initCause(t);
             }
         }