DLL jni Java6 update 1

Christoph Singewald christoph at singewald.at
Wed Mar 26 07:05:05 PDT 2008


Christoph Wrote:

> Robert Fraser Wrote:
> 
> > Christoph wrote:
> > > Hi All!
> > > 
> > > Ich have a problem with jni and Java6 update 1. 
> > > I have follwing files
> > > 
> > > my.dll  (DMD, bud)
> > > myjni.dll (SWIGm, dmc or bcc32) references my.dll
> > > 
> > > When I am using Java5 everthing runs fine.
> > > Ich I use Java6 I get an access violation and the end of the app, I think when it happens when java is unloding the dll. I tested it with a plain dll without gc and any other D function:
> > > 
> > > --DLL
> > > 
> > > import std.c.windows.windows;
> > > HINSTANCE g_hInst;
> > > 
> > > extern(C) export int getX() {
> > >         return 1;
> > > }
> > > 
> > > 
> > > extern (Windows) 
> > >     BOOL DllMain(HINSTANCE hInstance, ULONG ulReason, LPVOID pvReserved) {
> > >    switch (ulReason) {
> > > 	    case DLL_THREAD_ATTACH:
> > > 	    case DLL_THREAD_DETACH:
> > > 	        return false;
> > >     }
> > >     g_hInst=hInstance;
> > >     return true;
> > >    
> > > }
> > > 
> > > If I use a c++ dll created with bcc32/dmc everthing  runs fine with Java6.
> > > 
> > > thank you for helping 
> > > christoph
> > 
> > Hi Christoph,
> > 
> > Sorry I can't help you with your problem directly. However, if you plan 
> > to use D's garbage collection, be warned that D and Java's garbage 
> > collectors don't get along (since they use the same signals). If you 
> > need the GC, IPC is a better solution (check 
> > http://www.dsource.org/projects/dbus-d/ ). Frank Benoit probably knows 
> > more about that than I do.
> > 
> > If you don't need D's GC, then JNI is a perfect solution, but I'm not 
> > sure exactly what your problem is.
> > 
> > Sorry I couldn't be more helpful,
> > Robert
> 
> Hi Robert!
> 
> Thank you for your fast reply. You're are right, thats a real problem under unix/linux. But the curent problem appear to me under windows, I did not test it under linux at the moment. So may be I have to find another solution, because I want to use it under inw32 and linux
> Christoph
> 
> 

I capitulate! On windows I had as above said problems loading the D-DLL and under Linux there are real probrlems with the GC. I use sockets now and I am happy with it.

christoph


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