Hello Steve , Thanks for your quick reply - in the SAP JVM 7 I currently do not have a separate aix/classes/java/lang/ClassLoaderHelper.java to support the flexible extensions , but do everything in solaris/classes/java/lang/ClassLoaderHelper.java ( which is used for Linux/Solaris/AIX/HPUX in SAPJVM7 - I simply have some if / else there to distinguish AIX and the "rest" ). In case that we have more candidates for aix -specific files than just one, we could indeed have it at aix/classes ... --> what do the others think ? Also , should we support more than *.a / *.so + full-name (the cases we did ) on AIX ? Best regards, Matthias Am 18.09.2012 13:15, schrieb Steve Poole:

hi Matthias - I think adding that sort of support to OpenJDK makes sense. We should not artificially restrict the form that a library name takes. If AIX can load it we should support it :-)

It also sounds like we need our own version of solaris/classes/java/lang/ClassLoaderHelper.java Is that aix/classes/java/lang/ClassLoaderHelper.java ? :-)

On 18 Sep 2012, at 09:43, Matthias Baesken <matthias.baesken@sap.com> wrote:

...

Hello ,

I noticed that the IBM J9 is more flexible in the System.loadLibrary(libName) function; in the OpenJDK JDK or SAPJVM we had a fix prefix and suffix for libraries to be loaded via System.loadLibrary(libName).

E.g. for Linux the fix library name prefix was lib and the suffix .so , so for loading libtesting.so one would call

System.loadLibrary("testing");

However IBM J9 would (at least) support also loading *.a and full-name for the library (maybe even more combinations ?) . E.g.

libtesting.a => System.loadLibrary("testing"); // works (at least with 6 and 7 )

libtesting.so => System.loadLibrary("testing"); // works (at least with 6 and 7 )

as well System.loadLibrary("libtesting.so"); // works also with full name(at least with 6 and 7)

Should we add this functionality also for OpenJDK ?

Fortunately with the MacOS-X port in jdk7 they added recently the functionality to support more flexible naming for lib loading. See in jdk7 :

solaris/classes/java/lang/ClassLoaderHelper.java

(still empty implementation) or

macosx/classes/java/lang/ClassLoaderHelper.java (where they support 2 extensions at the moment)

In the SAPJVM7 implementation I'll switch to use the solaris/classes/java/lang/ClassLoaderHelper.java for this, might be an option also for OpenJDK AIX port .

What do you think ?

Thanks and best regards, Matthias

(btw. I am a colleague of Goetz and Volker working with them in the SAPJVM group)