JCO difference between SAP J2ee 620 and Webas 640 for Internet Sales

Does anyone have some information on how Internet Sales manages JCO calls to R/3 or CRM on WebAS 640?
Till J2EE 620 the sapjco.jar file directory had to be in classpath along with the relevant dlls in WinNt directory.
WebAs 640 Java installation doesn't mandate any such steps.
How does this work? The jar probably is in the cluster/server/bin/ext folder but what about the native libraries? How are they loaded.
I am having problems making RFC calls to R/3 from a web application deployed on SAP WebAS 640.
This is not the internet sales application but a general J2EE application and I was wondering if i could use the same approach as used by Internet Sales to load the native libraries.
Any help would be appreciated.
Bharat.

Vivek,
We have the WebAs 640 Java system running on a AIX server. I placed the following folder under classpath
/usr/sap/<SAPSID>/JC**/j2ee/cluster/server/bin/ext/com.sap.mw.jco/sapjrfc.jar
The error thrown is
JCO.classInitialize(): Could not load middleware layer 'com.sap.mw.jco.rfc.MiddlewareRFC'
JCO.nativeInit(): Could not initialize dynamic link library sapjcorfc [Can't find library sapjcorfc (libsapjcorfc.a or .so) in sun.boot.library.path or java.library.path
sun.boot.library.path=/usr/java14_64/jre/bin
java.library.path=/usr/java14_64/jre/bin:/usr/java14_64/jre/bin/classic:/usr/java14_64/jre/bin:/usr/sap/RID/JC15/j2ee/os_libs:/usr/sap/RID/SYS/exe/run:/home/db2_mgr/sqllib/lib:/home/db2_mgr/sqllib/lib:/usr/lib:/usr/sap/RID/JC15/j2ee/os_libs:/usr/sap/RID/JC15/j2ee/os_libs:/usr/lib:/lib:/usr/sap/RID/SYS/exe/run:/home/db2_mgr/sqllib/lib:/home/db2_mgr/sqllib/lib]. java.library.path [/usr/java14_64/jre/bin:/usr/java14_64/jre/bin/classic:/usr/java14_64/jre/bin:/usr/sap/RID/JC15/j2ee/os_libs:/usr/sap/RID/SYS/exe/run:/home/db2_mgr/sqllib/lib:/home/db2_mgr/sqllib/lib:/usr/lib:/usr/sap/RID/JC15/j2ee/os_libs:/usr/sap/RID/JC15/j2ee/os_libs:/usr/lib:/lib:/usr/sap/RID/SYS/exe/run:/home/db2_mgr/sqllib/lib:/home/db2_mgr/sqllib/lib]
The problem is a search on libsapjcorfc.* only return dll files and no .so or .a files.
Wondering how ISA loads the native libraries on AIX!
Thx,
Bharat.

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