Serious problem with RMI on jdk15
ndenev at gmail.com
Mon Oct 13 14:59:03 UTC 2008
On Oct 13, 2008, at 5:47 PM, Nikolay Denev wrote:
> On Oct 9, 2008, at 4:35 PM, Nikolay Denev wrote:
>> Hi All,
>> I have the following problem : when I connect to a jmxremote
>> enabled application with jconsole the whole VM crashes with
>> segmentation fault.
>> I'm running amd64 7.1-PRE from yesterday, and the jdk is
>> Any help is greatly appreciated!
>> Nikolay Denev
> I think I've tracked down the problem.
> The JVM crashes when one requests the TotalPhysicalMemory from the
> OperatingSystem bean.
> The strange thing is that Sun specifies this value as "long", but
> how this can work on 64bit machines with many gigabytes of memory?
> What BSD patchset does is read the hw.physmem sysctl, which returns
> unsigned long, and then cast it to jlong and probably this is where
> the problem is.
> I've tried disabling the sysctl and hardcoding the result and my JVM
> does not crash anymore.
> Jconsole still does not show anything though.... and the same test
> program produces info when used with the diablo-jdk15...
> Nikolay Denev
As I read this now, It's not exactly correct, longs should be 4 bytes
on 32bit archs, and 8bytes on 64bit archs.
So the storage type for TotalPhysicalMemory should be ok. Maybe jlong
is not correctly adjusted to 8bytes on 64bit architectures?
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