I tried several of the examples of the seam book (the one by Michael Yuan) on 4.2.1 without any problems.
(with Java 6 on Suse Linux, but that shouldn't matter)
you can find the examples here:
Yesterday I ported my seam application to JBoss AS 4.2.1GA. I have setup the libraries. I forgot to place my datasource (*-ds.xml) file in the deploy folder but that was easily fixed. So, no problems with me either...
Here an excerpt from the log that I think matches yours:
14:50:38,624 INFO [JmxKernelAbstraction] installing MBean: jboss.j2ee:ear=AuthApplication.ear,jar=jboss-seam.jar,name=TimerServiceDispatcher,service=EJB3 with dependencies:
14:50:38,802 INFO [EJBContainer] STARTED EJB: org.jboss.seam.async.TimerServiceDispatcher ejbName: TimerServiceDispatcher
14:50:38,876 INFO [JmxKernelAbstraction] creating wrapper delegate for: org.jboss.ejb3.stateful.StatefulContainer
14:50:38,876 INFO [JmxKernelAbstraction] installing MBean: jboss.j2ee:ear=AuthApplication.ear,jar=jboss-seam.jar,name=EjbTransaction,service=EJB3 with dependencies:
14:50:38,950 INFO [EJBContainer] STARTED EJB: org.jboss.seam.transaction.EjbTransaction ejbName: EjbTransaction
14:50:38,994 INFO [EJB3Deployer] Deployed: file:/D:/AuthApplication.ear/jboss-seam.jar
14:50:38,994 INFO [TomcatDeployer] deploy, ctxPath=/AuthWebApp, warUrl=file:/D:/AuthApplication.ear/AuthWebApp.war/