On 7/8/12 12:02 PM, Philip Nienhuis wrote:
> Alexander Hansen wrote:
>> On 7/6/12 2:59 PM, Philip Nienhuis wrote:
>>
>> <snip>
>>
>>> Thanks.
>>>
>>> So, where in<JAVA_HOME>/ is the libjvm.so located?
>>>
>>> I could then patch it into pre_install.m.
>>
>> There's no such thing on OS X, but:
>>
>> $ javaconfig Library
>> /System/Library/Frameworks/JavaVM.framework/Libraries/libjvm.dylib
>> $ realpath
>> /System/Library/Frameworks/JavaVM.framework/Libraries/libjvm.dylib
>> /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Libraries/libclient.dylib
>>
>>
>> I.e. the real JVM library is<JAVA_HOME>/../Libraries/libclient.dylib .
>
> Thanks.
>
> Yet some more questions, sorry.
>
> 1. Is this location "stable", i.e. can one rely on it to always return
> this location, or would I need to include the system calls above to find
> libclient.dylib? (with or without filtering for "libclient.dylib")
> Or is "libclient.dylib" a sort of red herring and would other typical
> JDK files more reliably indicate a proper JDK presence?
>
>
<JAVA_HOME>/../Libraries/libclient.dylib is a valid path to the JVM
library on OS 10.5-10.7. I don't have 10.8 to check _that_.
However, I've learned through much strain and strife just to use the
tools that Apple provides. ;-) So it might be best just to use
`javaconfig Library` to extract the location of the JVM.
Similarly, `javaconfig Headers` will grab the directory for the headers,
e.g. jni.h . These have gotten moved around by Java updates from Apple
in the past.
> 2. In an earlier mail from you, I see you had JAVA_HOME set as follows:
> From: Alexander Hansen <alexanderk.hansen@gm...> - 2012-07-06 21:45
> <quote>
> octave:1> getenv('JAVA_HOME')
> ans = /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
> </quote>
>
> ==> Is there a particular reason to have it point all the way to
> ...../Contents/Home? (e.g., other programs needing a JAVA_HOME setting)
> IOW, would
> '/System/Library/Java/JavaVirtualMachines/1.6.0.jdk'
> suffice?
no.
> Or is that JAVA_HOME setting you showed simply the setting that works
> for installing the Java package?
>
This the JAVA_HOME setting that Apple picks _currently_ (it has changed
in the past). According to the description in 'man java_home':
The java_home command returns a path suitable for setting the JAVA_HOME
environment variable.
Also, if you don't provide the full path all the way to Contents/Home
you wind up with a JAVA_HOME which is not analogous to what you see on
other platforms:
$ ls /System/Library/Java/JavaVirtualMachines/1.6.0.jdk
Contents
$ ls /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/
Classes Commands Home Info.plist Libraries MacOS Resources
version.plist
$ ls /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
bin bundle lib man
> (Sorry if these are stupid questions - I know beans about Mac OSX.)
>
> Philip
That's quite all right. Java on OS X seems quite painful to deal with. :-)
--
Alexander Hansen, Ph.D.
Fink User Liaison
My package updates: http://finkakh.wordpress.com/
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