java - Inject Singleton Session Bean into a Stateless Session Bean -

is allowed (and practice) hold shared informations in our application using singleton session bean inside stateless session bean?

the ssb injected slsb.

@stateless public class myslsb {      @inject     myssb myssb; 

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@singleton @lock(read) public class myssb implements serializable {      private static final long serialversionuid = 1l; 

it more allowed. using singleton injections in stateless or statefull ejbs allow call business methods on ssb in slsb. 1 of trivial advantages using ssb concurrent capabilities. in example of method calls toward ssb locked on read , means threads accessing ssb methods on read mode unless thread holding lock on write.