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

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

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

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