ReverseProxy failing to engage in 2.0.x

Folks,

when I try to enable the Reverse Proxy Filter in web.xml and restart the geoserver
instance, it refuses to start yelling:

32427 [main] WARN org.mortbay.log - failed Reverse Proxy Filter
javax.servlet.ServletException: No GeoServerInfo instance found. Needed to look
for the proxy base URL
at org.geoserver.filters.ReverseProxyFilter.init(ReverseProxyFilter.java:123)
at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:589)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:139)
at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220)
at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:510)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
at
org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:222)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at org.mortbay.xml.XmlConfiguration.main(XmlConfiguration.java:977)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.mortbay.start.Main.invokeMain(Main.java:183)
at org.mortbay.start.Main.start(Main.java:497)
at org.mortbay.start.Main.main(Main.java:115)
32429 [main] WARN org.mortbay.log - Failed startup of context
org.mortbay.jetty.webapp.WebAppContext@52d654

javax.servlet.ServletException: No GeoServerInfo instance found. Needed to look
for the proxy base URL
at org.geoserver.filters.ReverseProxyFilter.init(ReverseProxyFilter.java:123)
at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)