Index: catalina/src/share/org/apache/catalina/core/StandardWrapperValve.java
===================================================================
--- catalina/src/share/org/apache/catalina/core/StandardWrapperValve.java	(revision 523569)
+++ catalina/src/share/org/apache/catalina/core/StandardWrapperValve.java	(working copy)
@@ -127,6 +127,8 @@
                 servlet = wrapper.allocate();
             }
         } catch (UnavailableException e) {
+            container.getLogger().error(sm.getString("standardWrapper.allocateException",
+                             wrapper.getName()), e);
             long available = wrapper.getAvailable();
             if ((available > 0L) && (available < Long.MAX_VALUE)) {
             	response.setDateHeader("Retry-After", available);