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I didn't find much information about EJB 3.1 Singletons in cluster enviroment. Is it true that specification says that those singletons will guarantee one instance per JVM - so one per cluster node. Not one per whole cluster?
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Yes, section 4.8 of the EJB 3.1 specification states that "each application will have one bean instance of the Singleton for each JVM".
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The singleton itself does not guarantee one instance per cluster. For that you need to specify a dependency. If you are using jboss then it is "jboss.ha:service=HASingletonDeployer,type=Barrier".
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