The Spring manual has a comprehensive chapter on EJB integration:
[...] it is important to note that using Spring does not bother you using EJB. In fact, Spring makes it much easier to access EJB and implement EJB and functionality within them. In addition, using Spring to access the services provided by the EJB allows you to implement these services for later transparency, switch between local EJB, remote EJB or POJO (plain old Java object) options, without client code, you need to change.
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