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Groups > comp.lang.java.programmer > #10472

Re: 64-bit gotcha

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On 12/3/2011 5:47 AM, Roedy Green wrote:
> A Java Web Start program I wrote a long time ago suddenly stopped
> working.  It sets the System clock to an atomic time server.
>
> I discovered the problem was it uses a 32--bit DLL via JNI  and my
> default Java is 64 bit.  It cannot use 32-bit DLLs.
>
> That surprises me. I would have thought MS would have had to come up
> with a way of doing that since so many DLLs would not yet be available
> in 32-bit.  Maybe it can in general, but just not in Java.

32 bit or 64 bit is a per process thing.

You can't have part of a process using 32 bit addresses and
another part using 64 bit addresses.

The JVM and native DLL's must have same bitness.

It is not Java specific.

If you are using C# then you can specify AnyCPU (32 bit or 64 bit),
x86 (32 bit only) and x64 (64 bit only) to stamp programs with
requirements.

Arne

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Thread

64-bit gotcha Roedy Green <see_website@mindprod.com.invalid> - 2011-12-03 02:47 -0800
  Re: 64-bit gotcha Arne Vajhøj <arne@vajhoej.dk> - 2011-12-03 15:20 -0500
    Re: 64-bit gotcha Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2011-12-03 14:01 -0800
      Re: 64-bit gotcha Roedy Green <see_website@mindprod.com.invalid> - 2011-12-03 18:17 -0800
        Re: 64-bit gotcha Martin Gregorie <martin@address-in-sig.invalid> - 2011-12-04 12:06 +0000
          Re: 64-bit gotcha Jeff Higgins <jeff@invalid.invalid> - 2011-12-04 08:57 -0500
            Re: 64-bit gotcha Jeff Higgins <jeff@invalid.invalid> - 2012-02-25 19:15 -0500
              Re: 64-bit gotcha Martin Gregorie <martin@address-in-sig.invalid> - 2012-02-26 00:53 +0000
                Re: 64-bit gotcha Jeff Higgins <jeff@invalid.invalid> - 2012-02-25 20:26 -0500
          Re: 64-bit gotcha Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-12-04 10:04 -0400
        Re: 64-bit gotcha Arne Vajhøj <arne@vajhoej.dk> - 2012-03-12 19:50 -0400
      Re: 64-bit gotcha Travers Naran <tnaran@gmail.com> - 2011-12-04 09:17 -0800
      Re: 64-bit gotcha Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-12-04 18:33 -0600
        Re: 64-bit gotcha Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2011-12-04 16:56 -0800
        Re: 64-bit gotcha Arne Vajhøj <arne@vajhoej.dk> - 2012-03-12 19:53 -0400
      Re: 64-bit gotcha Arne Vajhøj <arne@vajhoej.dk> - 2012-03-12 19:49 -0400

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