Hi Marc,
The clojure.osgi library aims at easing the pain in this area (
https://github.com/aav/clojure.osgi ).
But to be honest I don't really know it's current status.
For Counterclockwise, I've taken inspiration from clojure.osgi and
integrated the core concepts into a few classes.
In a nutshell, every entry point to the clojure world (especially for
loading namespaces -potentially lazily thanks to eclipse lazy plugins
infrastructure-) is wrapped in a call that ensures that as much dynamic
bindings as possible are established, as well as the context class loader
set.
You can see all this by looking at the activator for counterclockwise.
HTH,
Laurent
Le dimanche 13 octobre 2013, Mark Derricutt a écrit :
> Hey all,
>
> Once again I'm lending my hand at trying to get some clojure code working
> under OSGi, and once again hitting issues with the good ole class loader. I
> have a simple OSGi bundle project which embeds clojure.jar, and contains a
> single source file:
>
> (ns com.theoryinpractise.activator.osgi.components
> (:import (org.osgi.framework BundleActivator)))
>
> (deftype MyActivator []
> BundleActivator
> (start [this context]
> (println "Hello from service"))
> (stop [this context]
> (println "stopping")))
>
> In my OSGi metadata I have
> com.theoryinpractise.activator.osgi.components.MyActivator listed as the
> Bundle-Activator for the bundle, and when I load it I get the following
> exception:
>
> Caused by: java.lang.ExceptionInInitializerError
> at
> com.theoryinpractise.activator.osgi.components.MyActivator.<clinit>(components.clj:4)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
> at java.lang.Class.newInstance(Class.java:374)
> at org.apache.felix.framework.Felix.createBundleActivator(Felix.java:4336)
> at org.apache.felix.framework.Felix.activateBundle(Felix.java:2141)
> ... 32 more
> Caused by: java.io.FileNotFoundException: Could not locate
> clojure/core__init.class or clojure/core.clj on classpath:
> at clojure.lang.RT.load(RT.java:443)
> at clojure.lang.RT.load(RT.java:411)
> at clojure.lang.RT.doInit(RT.java:447)
> at clojure.lang.RT.<clinit>(RT.java:329)
> ... 40 more
> java.lang.ExceptionInInitializerError
>
> When I look at the decompiled class ( using JD-GUI ) I see there's a
> static initialiser pulling in the println function:
>
> public final class MyActivator implements BundleActivator, IType {
> public static final Var const__0 = (Var)RT.var("clojure.core", "println");
> …
>
> Tracing this down into RT.baseLoader():
>
> static public ClassLoader baseLoader(){
> if(Compiler.LOADER.isBound())
> return (ClassLoader) Compiler.LOADER.deref();
> else if(booleanCast(USE_CONTEXT_CLASSLOADER.deref()))
> return Thread.currentThread().getContextClassLoader();
> return Compiler.class.getClassLoader();
> }
>
> I find that Compiler.LOADER.isBound() is false, and
> booleanCast(USE_CONTEXT_CLASSLOADER.deref()) is true, which leads to
> using the class loader for the OSGi runtime and *not* the class loader
> that happens to actually know anything about Clojure, which would be the
> OSGi Bundle classloader for my package.
>
> Does anyone know of a way around this? Or will I need to give up on trying
> to use pure-clojure here and use Java for my activator, and call
> Compiler.LOADER.set(myclassloader) and then do some RT.* love?
>
> Cheers,
> Mark
>
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