Re: [Wrapper-user] getting hardware arch using just java

[Richard E. <rem...@ed...>]

Leif,

The native libraries are one of the issues. On a 64 bit machine if
I install the 64 bit wrapper and libwrapper.so can I run a 32 bit
jvm or must I run a 64 bit jvm?
Thanks.

Richard


Leif Mortenson wrote:
> Richard,
>    Oh.  To do that you are going to need to use Runtime.exec to
> run "uname -a" or some variant.  Note that if you are worried about
> native libraries within Java though, it is the bit depth of the JVM, not
> that of the hardware that is going to matter to you.
> 
> Cheers,
> Leif
> 
> Richard Emberson wrote:
>> On my 64 linux workstation when I run java 1.4.2_11,
>> a 32 bit version of Java, sun.arch.data.model == 32;
>> but when I run java 1.5.0_06 amd64, a 64 bit version
>> of Java, sun.arch.data.model == 64.
>> I was not clear. I wish to know the underlying
>> hardware machine bits, 32 or 64, if possible from
>> within java.
>>
>> Richard
>>
>> Leif Mortenson wrote:
>>> Richard,
>>>    Download the source distribution and take a look at the build.xml 
>>> in the root
>>> directory.  It does exactly this.   If you want to see an example of 
>>> it being done
>>> in Java, then take a look at the source of the WrapperManager class 
>>> in the
>>> generateDetailedNativeLibraryBaseName method.  The JVM bits are accessed
>>> as follows:
>>>        m_jvmBits = Integer.getInteger( "sun.arch.data.model", -1 
>>> ).intValue();
>>>    Note that the property does not exist on all JVMs.
>>>
>>> Cheers,
>>> Leif
>>>
>>> Richard Emberson wrote:
>>>> I have to support solaris, linux and windows on
>>>> 32 and 64 bit machines.
>>>> The wrapper executable and native library comes in
>>>> 32 and 64 bit versions for those OSs.
>>>> What I need is the ability during an installation
>>>> to know what the machine (the hardware) architecture
>>>> is, 32 or 64 bit. I need to be able to know this
>>>> from within a java process (actually an Ant task).
>>>> I discovered today on my 64 bit workstation that if
>>>> I run java 1.4.x, a 32 bit java, then the system
>>>> property os.arch has the value i386 but if I run java
>>>> 1.5.x the os.arch has the value amd64 --- os.arch
>>>> does not give the hardware architecture but rather
>>>> the java vm architecture. In order to install the
>>>> correct version of the wrapper executable and
>>>> native libaray I need the true hardware architecture
>>>> independent of what jvm I will be running.
>>>> Any thoughts as to how to get this information
>>>> using just java?
>>>>
>>>> Richard
>>>>
>>>
>>>
>>>
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>>
>>
> 
> 
> 
> -------------------------------------------------------
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> easier
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