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EJB3 @Lock Annotation for CDI Beans

Guest Author

The EJB 3 @Lock annotation is pretty unique, interesting and useful. It provides an elegant declarative way of controlling concurrency for beans that can be shared across multiple threads such as singletons. As of Java EE 7 the annotation is only available to EJB 3 @Singleton session beans. There is a lot of value to making this bean available to all CDI beans in general. Very recently Stephan Knitelius did exactly that through a pretty simple CDI interceptor. You can read his nice write-up here.

In the longer term this work probably belongs somewhere in the standard such as in an update of the Java EE Concurrency specification or a modular CDI 2 specification. Another good place for Stephen's work is the DeltaSpike project. There are many other cool EJB 3 features that could be similarly made available to CDI beans generally such as @Startup, @Asynchronous and @MaxConcurrency. Some of these issues have long been discussed in the EJB specification JIRA entries.

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