Hi,
On Aug 3, 10:16 am, Adie <[email protected]> wrote:
> for e.g
> (import '(javax.persistence Persistence)
> gives a
> java.lang.ClassNotFoundException: javax.persistence.Persistence
> (NO_SOURCE_FILE:0) error
>
> How will i import javax.persistence properly?
You have to name the Classes or Interfaces in the `import` form.
(import '(javax.persistence EntityManager EntityManagerFactory
Persistence))
If you get a class not found exception, check that everything you
need is in your classpath. (java -cp some-
require.jar:clojure.jar ....)
> How would i define a class that implements this in clojure?
>
> (ns com.demo.HelloWorld
> (:gen-class
> :extends [javax.persistence]))
Suppose EntityManager is an Interface you do this like that:
(ns com.demo.HelloWorld
(:gen-class
:implements [javax.persistence.EntityManager]))
If EntityManager is a class, use:
(ns com.demo.HelloWorld
(:gen-class
:extends javax.persistence.EntityManager))
If you don't need a named class, you can also use `proxy`:
(proxy [javax.persistence.EntityManager] []
(methodA [] ...)
(methodB [some-arg] ...)
...)
> How can i write this effectively in clojure
>
> EntityManagerFactory emf =
> Persistence.createEntityManagerFactory("helloworld");
(let [emf (Persistence/createEntityManagerFactory "helloworld")]
..)
Calls to static methods look like qualified calls into a clojure
namespace.
Note: many details are left out in the above. Read more on
http://clojure.org/compilation. You can also look in one of the
many clojure projects which might serve as an example.
Hope this helps.
Sincerely
Meikel
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