NullPointerException when calling printDetails on cache containing nested clustered SFSB

After invoking an operation spanning a clustered EJB3 SFSB that has a reference to a another
clustered EJB3 SFSB, if you try to call printDetails() on the EJB3 SFSB cache, you'll get an exception
like this:

java.lang.NullPointerException
org.jboss.ejb3.stateful.StatefulBeanContext.hashCode(StatefulBeanContext.java:927)
java.lang.Object.toString(Object.java:236)
java.lang.String.valueOf(String.java:2838)
java.lang.StringBuffer.append(StringBuffer.java:236)
org.jboss.cache.AbstractNode.printDetailsInMap(AbstractNode.java:176)
org.jboss.cache.Node.printDetails(Node.java:411)
org.jboss.cache.AbstractNode.printDetailsInMap(AbstractNode.java:185)
org.jboss.cache.Node.printDetails(Node.java:411)
org.jboss.cache.AbstractNode.printDetailsInMap(AbstractNode.java:185)
org.jboss.cache.Node.printDetails(Node.java:411)
org.jboss.cache.TreeCache.printDetails(TreeCache.java:4181)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:616)
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
org.jboss.jmx.adaptor.control.Server.invokeOpByName(Server.java:258)
org.jboss.jmx.adaptor.control.Server.invokeOp(Server.java:223)
org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.invokeOp(HtmlAdaptorServlet.java:276)
org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.processRequest(HtmlAdaptorServlet.java:100)
org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.doPost(HtmlAdaptorServlet.java:82)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

This is due to trying to call to hashCode() on a ProxiedStatefulBeanContext which doesn't
contain any containerClusterUid as such. Instead, ProxiedStatefulBeanContext should
somehow pass the request for containerClusterUid to its delegate.