Index: java/engine/org/apache/derby/impl/jdbc/EmbedBlob.java
===================================================================
--- java/engine/org/apache/derby/impl/jdbc/EmbedBlob.java	(revision 620735)
+++ java/engine/org/apache/derby/impl/jdbc/EmbedBlob.java	(working copy)
@@ -923,6 +923,8 @@
                 throw Util.setStreamFailure (e);
             }
         }
+           
+        localConn.removeLOBMapping(locator);
     }
     
     /**
Index: java/engine/org/apache/derby/impl/jdbc/EmbedClob.java
===================================================================
--- java/engine/org/apache/derby/impl/jdbc/EmbedClob.java	(revision 620735)
+++ java/engine/org/apache/derby/impl/jdbc/EmbedClob.java	(working copy)
@@ -664,6 +664,7 @@
                 throw Util.setStreamFailure(e);
             } finally {
                 this.clob = null;
+                localConn.removeLOBMapping(locator);
             }
         }
     }