In JBoss 4.2.1 explode and restart works fine. From 4.2.2 when I use Stateless beans (for example to authenticate) I get IllegalStateException after restart (and ~5MB memory leak).
Is this a bug ?

I tested also seam-booking example and I got the same error.

09:40:36,890 WARN [JmxKernelAbstraction] jboss.j2ee:ear=jboss-seam-booking.ear,jar=jboss-seam.jar,name=EjbSynchronizations,service=EJB3 is not registered
09:40:36,890 WARN [StatelessDelegateWrapper] Stopping failed jboss.j2ee:ear=jboss-seam-booking.ear,jar=jboss-seam-booking.jar,name=AuthenticatorAction,service=EJB3
java.lang.RuntimeException: java.lang.IllegalStateException: Attempted to invoke a Seam component outside the an initialized application
 at org.jboss.ejb3.interceptor.LifecycleInterceptorHandler.preDestroy(LifecycleInterceptorHandler.java:135)
 at org.jboss.ejb3.EJBContainer.invokePreDestroy(EJBContainer.java:624)
 at org.jboss.ejb3.AbstractPool.remove(AbstractPool.java:207)
 at org.jboss.ejb3.InfinitePool.destroy(InfinitePool.java:42)
 at org.jboss.ejb3.ThreadlocalPool.destroy(ThreadlocalPool.java:68)
 at org.jboss.ejb3.EJBContainer.stop(EJBContainer.java:592)
 at org.jboss.ejb3.SessionContainer.stop(SessionContainer.java:183)
 at org.jboss.ejb3.stateless.StatelessContainer.stop(StatelessContainer.java:130)
 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.jboss.ejb3.ServiceDelegateWrapper.stopService(ServiceDelegateWrapper.java:119)
 at org.jboss.system.ServiceMBeanSupport.jbossInternalStop(ServiceMBeanSupport.java:315)
 at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:247)
 at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
 at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
 at $Proxy0.stop(Unknown Source)
 at org.jboss.system.ServiceController.stop(ServiceController.java:508)
 at sun.reflect.GeneratedMethodAccessor145.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
 at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
 at $Proxy139.stop(Unknown Source)
 at org.jboss.ejb3.JmxKernelAbstraction.uninstallMBean(JmxKernelAbstraction.java:175)
 at org.jboss.ejb3.JmxKernelAbstraction.uninstall(JmxKernelAbstraction.java:202)
 at org.jboss.ejb3.Ejb3Deployment.stop(Ejb3Deployment.java:661)
 at org.jboss.ejb3.Ejb3Module.stopService(Ejb3Module.java:107)
 at org.jboss.system.ServiceMBeanSupport.jbossInternalStop(ServiceMBeanSupport.java:315)
 at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:247)
 at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
 at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
 at $Proxy0.stop(Unknown Source)
 at org.jboss.system.ServiceController.stop(ServiceController.java:508)
 at sun.reflect.GeneratedMethodAccessor145.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
 at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
 at $Proxy33.stop(Unknown Source)
 at org.jboss.ejb3.EJB3Deployer.stop(EJB3Deployer.java:532)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
 at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
 at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
 at org.jboss.mx.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.java:97)
 at org.jboss.system.InterceptorServiceMBeanSupport.invokeNext(InterceptorServiceMBeanSupport.java:238)
 at org.jboss.wsf.container.jboss42.DeployerInterceptor.stop(DeployerInterceptor.java:98)
 at org.jboss.deployment.SubDeployerInterceptorSupport$XMBeanInterceptor.stop(SubDeployerInterceptorSupport.java:196)
 at org.jboss.deployment.SubDeployerInterceptor.invoke(SubDeployerInterceptor.java:99)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
 at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
 at $Proxy34.stop(Unknown Source)
 at org.jboss.deployment.MainDeployer.stop(MainDeployer.java:667)
 at org.jboss.deployment.MainDeployer.stop(MainDeployer.java:659)
 at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:638)
 at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:632)
 at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:615)
 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.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
 at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
 at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
 at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
 at $Proxy9.undeploy(Unknown Source)
 at org.jboss.deployment.scanner.URLDeploymentScanner.undeploy(URLDeploymentScanner.java:450)
 at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:604)
 at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:263)
 at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.loop(AbstractDeploymentScanner.java:274)
 at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.run(AbstractDeploymentScanner.java:225)
Caused by: java.lang.IllegalStateException: Attempted to invoke a Seam component outside the an initialized application
 at org.jboss.seam.contexts.Lifecycle.getApplication(Lifecycle.java:36)
 at org.jboss.seam.contexts.Lifecycle.beginCall(Lifecycle.java:84)
 at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:113)
 at org.jboss.seam.intercept.RootInterceptor.invokeAndHandle(RootInterceptor.java:84)
 at org.jboss.seam.intercept.SessionBeanInterceptor.preDestroy(SessionBeanInterceptor.java:68)
 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.jboss.ejb3.interceptor.LifecycleInvocationContextImpl.proceed(LifecycleInvocationContextImpl.java:131)
 at org.jboss.ejb3.interceptor.LifecycleInterceptorHandler.preDestroy(LifecycleInterceptorHandler.java:131)
 ... 106 more