diff --git a/tool-util/servlet/src/java/org/sakaiproject/util/RequestFilter.java b/tool-util/servlet/src/java/org/sakaiproject/util/RequestFilter.java
index b846eb5..76f5c15 100644
--- a/tool-util/servlet/src/java/org/sakaiproject/util/RequestFilter.java
+++ b/tool-util/servlet/src/java/org/sakaiproject/util/RequestFilter.java
@@ -604,9 +604,20 @@ public class RequestFilter implements Filter
 					// post-process response
 					postProcessResponse(s, req, resp);
 				}
-				catch (Throwable t)
+				catch (RuntimeException t)
 				{
 					M_log.warn("", t);
+					throw t;
+				}
+				catch (IOException ioe)
+				{
+					M_log.warn("", ioe);
+					throw ioe;
+				}
+				catch (ServletException se)
+				{
+					M_log.warn("", se);
+					throw se;
 				}
 				finally
 				{