An @Clustered bean with <clustered>false</clustered> in its jboss.xml is still using the clustered proxy factory:

2008-05-08 12:56:44,768 ERROR [org.jboss.kernel.plugins.dependency.AbstractKernelController] (RMI TCP Connection(27)-127.0.0.1) Error installing to Start: name=jboss.j2ee:ear=clusteredsession-test.jar,jar=clusteredsession-test.jar,name=NonClusteredStateful,service=EJB3 state=Create
java.lang.IllegalStateException: Partition BogusPartition not found
at org.jboss.ha.framework.server.HAPartitionLocator.getHAPartition(HAPartitionLocator.java:125)
at org.jboss.ejb3.proxy.factory.stateful.StatefulClusterProxyFactory.start(StatefulClusterProxyFactory.java:144)
at org.jboss.ejb3.session.ProxyDeployer.start(ProxyDeployer.java:95)
at org.jboss.ejb3.session.SessionContainer.start(SessionContainer.java:188)
at org.jboss.ejb3.stateful.StatefulContainer.start(StatefulContainer.java:249)