I read an article in Javaworld.com about converting existing classes to
EJB. You may want to have a look there.
Devraj
At 07:28 3/07/01 +0200, you wrote:
>Hello,
>
>I've a question on inheritence in EJB.
>As I'm working on the adaption of an existing Java framework, I have to
>convert many normal Java classes to EJB. But I'm not sure what to do with
>the inheritence. Someone in the list suggested I let the RemoteInterface
>inherit from some super interface and let the BeanClass inherit from the
>super implementation. This way, if a type of the super interface is
>expected, then an EJB RemoteInterface can be returned, which looks quite
>reasonable to me, so I was trying to do just that.
>But the problem is, I didn't seem to be able to compile because I cann't
>have any constructor in the BeanClass (O'Reilly book), which I do have in
>the original class that the bean should substitute:-(
>I know, normlly the stuff in the constructor is done in the ejbCreate, but
>in my case, I have invokation of super() in the constructor, which is of
>course bad for EJB. But it didn't work even if I don't use the super() but
>move the init code from super class to the bean, compiler simply says it
>cann't deal with the constructor in the super class:-(
>Now I'm wondering, is it that I've done something wrong or is such thing not
>possible by definition? Anyone with experience here, comments are heartily
>welcome!
>Also, another question would be: If the purpose of an EJB is to substitute
>some normal class, should I put it in it's own package, or should I leave it
>in the original package? If I put it in a new package, then many "protected"
>access modifier has to be "cracked open" to "public" in the original
>package, which seems hairy to me. But I don't know whether it's
>possible/feasible to package EJBs with the normal classes and make them one
>big jar, will the app server have any problem with it?
>The problems are quite urgent and I'm looking forward to your reply!
>Many thanks in advance!
>
>regards
>ZHU Jia
>
>
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