MissingResourceException: checking file fingerprints under Winstone while proxied

We run Hudson using the embedded Winstone container proxied behind Apache through the ajp13
protocol. We recently upgraded from Hudson 1.128 to Hudson 1.211 and started seeing the following
exception in the log when uploading a file to check its fingerprint. The error we see from apache is "Bad
gateway." It appears that the winstone app server isn't properly packaged.

[Winstone 2008/05/06 16:01:56] - Error within request handler thread
java.util.MissingResourceException: Can't find resource for bundle java.util.PropertyResourceBundle,
key Ajp13Listener.ShortPacket
at java.util.ResourceBundle.getObject(ResourceBundle.java:325)
at java.util.ResourceBundle.getString(ResourceBundle.java:285)
at winstone.WinstoneResourceBundle.getString(WinstoneResourceBundle.java:40)
at winstone.ajp13.Ajp13Listener.getBodyResponsePacket(Ajp13Listener.java:426)
at winstone.ajp13.Ajp13Listener.allocateRequestResponse(Ajp13Listener.java:194)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:79)
at java.lang.Thread.run(Thread.java:595)