When is it necessary or convenient to use Spring or EJB3 or all of them together?

When is it necessary or convenient to use Spring or EJB3 or all of them together?

spring jsf jakarta-ee ejb service-layer

spring

What is the difference between EJB, hibernate, spring and JSF? [closed]

java hibernate spring jsf ejb

spring

When to use Spring @Transactional (propagation = Propagation.SUPPORTS)?

java spring jakarta-ee ejb

spring

How to handle internal calls on Spring/EJB/Mockito... proxies?

java hibernate spring jakarta-ee ejb

spring

Using Spring MVC 3.0 and @EJB annotation wtihout mappedName?

spring model-view-controller ejb

spring

Dependency Injection EJB 3 - too many choices?

java spring dependency-injection ejb cdi

spring

Spring <jee:remote-slsb> and JBoss AS7 - No EJB receiver available for handling

spring ejb jboss7.x

spring

Why Stateless EJBs are pooled?

java spring jakarta-ee ejb

spring

Are EJBs still useful? And what are the Spring Framework ways to replace EJBs?

java spring jakarta-ee ejb

spring

What features does EJB3 bring and also how does EJB3 stack up with the Spring Framework? [closed]

java spring ejb-3.0 ejb

spring

EJB3 / JPA @Transactional

java spring ejb

spring

Does a new transaction detach all previous entities?

java spring jpa transactions ejb

spring