We develop application based on EJB, Hibernate, GWT using Netbeans(now 6.7). The first choice for server was Glassfish v2, where everything worked pretty fine. After migrating to GFv3 (because of @Singleton annotation presence) we get variety of errors not concerned with application, but with server(e.g. security/deploy exceptions of unknown background). Some of them cause a server hang often after redeployment or even during working, when servlets stop processing requests. We have to kill(linux) glassfish instance, before have any chance to continue working.
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