Subj : Re: Rhino and JNI
To   : netscape.public.mozilla.jseng
From : Paulo R. Panhoto
Date : Thu Jul 08 2004 05:01 pm

	After studying a bit more I discovered the solution. I had to specify 
the option "-Xms4M" as initial heap size. I guess it can work with a 
smaller heap.

Paulo R. Panhoto wrote:
>     Hello everyone,
> 
>     I would like to know if anyone has experienced problems with rhino 
> and JNI. I have a Java class that wraps rhino and I would like to use it 
> in both a Java application and a DLL. When I invoke a JVM from my DLL 
> (yet a native executable program, it will be the DLL when stable) I get 
> an access violation when the GC runs.
> 
>     Can I get some help? I  am using Visual C++ 6 and j2sdk1.4.2_05
> 
>     Thanks in advance.
> 
>     Here is the relevant code:
> 
> Wrapper.cpp -----------------------------------------------------
> 
> BOOL WINAPI DllMain(HINSTANCE, DWORD dwReason, LPVOID)
> {
>   switch(dwReason)
>   {
>   case DLL_PROCESS_ATTACH:
>     {
>       JavaVMInitArgs args = {0};
> 
>       args.version = JNI_VERSION_1_4;
>       args.nOptions = 3;
>       JavaVMOption options[] =
>       {{"-Djava.class.path=.;c:\\lib\\java\\rhino1_5R5\\js.jar;"},
>        {"-verbose:gc"}, {"-Xnoclassgc"}};
>       args.options = options;
> 
>       if(JNI_CreateJavaVM(&jvm, (void **) &env, &args) < 0)
>         return FALSE;
>     }
>     break;
>   case DLL_PROCESS_DETACH:
>     jvm->DestroyJavaVM();
>     break;
>   }
> 
>   return TRUE;
> }
> 
> void WINAPI Init()
> {
>   jclass obj_class = env->FindClass("Invoker");
>   jmethodID id = env->GetStaticMethodID(obj_class, "main", 
> "([Ljava/lang/String;)V");
>   env->CallStaticVoidMethod(obj_class, id);
> }
> 
> Invoker.java --------------------------------------------------------
> 
> import org.mozilla.javascript.*;
> class Invoker
> {
>   public static void main(String[] args)
>   {
>     System.out.println("enter");
>     Context c = Context.enter();
> 
>     System.out.println("init");
>     Scriptable s = c.initStandardObjects();
> 
>     try
>     {
>       System.out.println("eval");
>       System.out.println(c.evaluateString(s, "1;", "teste", 0, null));
>     }
>     catch(Exception e)
>     {
>       e.printStackTrace();
>     }
> 
>     System.out.println("exit");
>     Context.exit();
>   }
> 
> }

.