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Java Forum / General / May 2006ejb - remote or local interface ?
Hello, What is the overhead of calling an ejb via its remote interface (instead of the local interface) knowing that the client and the ejb are within the same application server ? Isn't it close to zero ? Would you then say it is a good advice to systematicly call the ejb via the remote interface in case one day the ejb had to be deployed on a specific remote server ? > Hello, > What is the overhead of calling an ejb via its remote interface > (instead of the local interface) knowing that the client and the ejb > are within the same application server ? Isn't it close to zero ? I don't know the magnitude of the difference, but it is significant and certainly not close to zero. > Would you then say it is a good advice to systematicly call the ejb via > the remote interface in case one day the ejb had to be deployed on a > specific remote server ? YAGNI? Possibly, but how likely is that possibility? Mark We have an web app and EJB's on the same server. I didn't write the EJB's, but the chap that did set them up to be called by the local interface and mentioned that it did improve performance significantly over the remote interface calls.....for what it's worth. Larry A real application server (our is websphere) is not clever enough to shortcut the overhead if the web app and EJB are on the same server ? There is a big performance difference because local interface allow the ejb parameters to be passed by reference (memory address) and remote interfaces require the parameters to be passed by value (objects are serialized and deserialized). You can also ONLY use local interfaces if you are making use of entity beans with entity bean relationships. Rather deal with the problem of the remote interface when you get to it because there is a big chance that the logic will be slightly different, and that the access and/or transaction settings may need to be modified to. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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