Re: How to set up Library list for servlet on AS400?

["Fred Kulack" <kulack@xxxxxxxxxx>]

On 03/13/2001 at 12:08:53 PM, owner-java400-l@midrange.com wrote:
Now my question is: I use JNI to call RPG in servlets which are invoked by
WebSphere. How do I add MYLIB to the "library path" of the servlets or
WebSphere?

(BTW, it appears that JNI call is a lot faster than Toolbox program call in
Qshell or RUNJVA)
--- end of excerpt ---

Yeah, its going to be an INCREDIBLE amount faster.
BUT, its VERY different beast. You are actually running
your native code INSIDE the same process and thread as the
application. In a servlet environment, this means that when
you do 'stuff' wrong, you could wack the servlet engine job.
You have great power available to you, but via unsafe use
of resources, APIs, or locks, you could do bad things to
your servlet engine. (But who cares, in the end, you'll have
a better product). 8-)

Instead of mucking with the load path and the library
list, you may want to just load the code directly
from the appropriate library.
Further, for testing purposes, you can just make the
location a java property, then set that property
when you're testing new versions of code.
I prefer that model.
     String   jniCode =
         System.getProperty("myjni.location",
                            "/QSYS.LIB/MYLIB.LIB/MYJNI.SRVPGM");
     System.load(jniCode);



"The stuff we call "software" is not like anything that human society
  is used to thinking about. Software is something like a machine, and
  something like mathematics, and something like language, and
  something like thought, and art, and information...
  but software is not in fact any of those other things."
Bruce Sterling - The Hacker Crackdown

Fred A. Kulack  -  AS/400e  Java and Java DB2 access, Jdbc, JTA, etc...
IBM in Rochester, MN  (Phone: 507.253.5982   T/L 553-5982)
mailto:kulack@us.ibm.com   Personal: mailto:kulack@bresnanlink.net
AOL Instant Messenger: Home:FKulack  Work:FKulackWrk

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