"Jim - FooBar();" <[email protected]> writes:
> Now, the first time I (load-file "xxx.core.clj") everything is
> perfectly fine. The minute I make a change and re-load I get:
>
> NoClassDefFoundError Could not initialize class yyy.Foo
This confuses me, because the JVM should only be loading and
initializing the Java class once. Re-loading the Clojure namespace
shouldn’t report an error unless initialization actually failed the
first time around.
That said, you will definitely get errors if you have a Java class
`require` a namespace in a static initializer which then `import`s the
class. Clojure `import` causes referenced classes to be initialized,
which runs static initializers, which means a circular namespace ->
initializer -> namespace dependency effectively reduces to a circular
namespace dependency.
The solution I’ve been using lately is to push the Java-side
namespace-loading into a private static inner class of the original Java
class. This provides the benefits of JVM-managed single-initialization,
but defers execution of that initialization code until something
actually needs one of the imported Vars. Example:
https://github.com/damballa/abracad/blob/master/src/java/abracad/avro/ClojureDatumReader.java
HTH,
-Marshall
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