Hello; @Local is used for calling EJB methods inside Application Server (For example, your web application artifacts(servlets) running inside Web Container makes calls to @Local EJBs running inside EJB container. Both of web and ejb container contained in the sample application server). You are not able to call @Local EJBs from outside of the application server, for example from Remote Java Swing Client running in different JVM from Application Server. In @Local mode, EJB method parameters are passed by reference, means that any change/update to the method parameters in called EJB method are reflected on the calling side (client).
@Remote is used for calling EJB methods inside/outside of the Application Server. EJB method parameters are passed by value, means that values are Marhsalled/UnMarshalled between JVM boundaries. Even if caller lives in same application server, parameters are marshalled/unmarshalled. Therefore there is always a performance penalty. (Note : Some application servers may optimize @Remote calls inside application servers!, even if it does, still not performancable as @Local). Hope this helps! Thanks; --Gurkan 2010/2/9 joe <fischauto...@yahoo.de> > Hi, > > I am quite new to OpenEJB and EJB3 in general, so many things are nebulous > for me. > > What's the right strategy for unit testing EJBs? > > My understanding is the following: > For testing i should use the embedded EJB container. > > I guessed to make an EJB locally testable it has to implement an interface > annotated with @Local. > But it seems i am wrong. My EJBs methods are also invokeable even if they > implement an interface annotated > with @Remote. > > So in general Remote-EJBs are locally invokeable? if yes whats the @Local > for? > Just to make EJB methods not invokeable for remote clients? > > in the "Simple Stateless Example" ( > http://openejb.apache.org/3.0/simple-stateless-example.html) > two interfaces (with identical signatures) are used one with implicit > @Local and one with @Remote annotation. > Why, maybe some use case? > > -- Gurkan Erdogdu http://gurkanerdogdu.blogspot.com
