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

Have you tried this method (Jai Goradia posted it to the WebSphere
Application Server for iSeries newsgroup earlier in responce to Bruce's
question):

Bruce,
        Here is what i would do. In the admin console find and click on
your
application server in the topology view.  On the general tab for the
application server you will see a field where you can specify command line
arguments for the Java Virtual Machine that will be created for use by the
Application server. It is typically prefilled with a value for the java
minimum heap size namely an entry like -ms32m. This field allows you to
specify system properties for the JVM. add a property called
java.library.path in there. So you would enter
-Djava.library.path=/QSYS.LIB/MYLIB.LIB after separating the previous value
in that field with a space in between(ie. -ms32m
-Djava.library.path=/QSYS.LIB/MYLIB.LIB).  This tells the JVM in the
application server executing  the servlets where to look for the service
programs that the servlet code references after doing a loadLibrary() in a
static section in the code to load the service program native code into
memory.  Once you add this property to the command line arguments you will
need to restart the application server for it to take effect.  Try that.


Frances Stewart
WebSphere Application Server for iSeries 400
IBM Rochester


mandy.shaw@uk.catalyst-solutions.com@midrange.com on 03/13/2001 12:10:15 PM

Please respond to JAVA400-L@midrange.com

Sent by:  owner-java400-l@midrange.com


To:   JAVA400-L@midrange.com
cc:
Subject:  Re: How to set up Library list for servlet on AS400?



I should be very interested in the answer to this one also - the only way I
have come up with is using the WAS Admin Console to tell the WAS Web
Application Server to run under a specific user profile that has the right
library list on its job description. This also required me to go into the
Ops Nav Application Admin thing to tell WAS that this user profile was
allowed to be used for this purpose. I never actually finished testing this
so I don't even know whether it would have worked.
Incidentally, when you compare performance with a Toolbox call, it would be
interesting to know whether you'd optimised the Toolbox to level 40 before
the test or not.
Mandy





"Bruce Jin" <brucej@MRC-PRODUCTIVITY.COM> on 13/03/2001 17:26:17

Please respond to JAVA400-L@midrange.com

To:   JAVA400-L@midrange.com
cc:    (bcc: Mandy Shaw/Pacific/UK)
Subject:  Re: How to set up Library list for servlet on AS400?





Hi Jim.

Thanks for the response!
I can now call JNI to RPG in Qshell or RUNJVA using java.library.path
property.

I found it is interesting that I can also add MYLIB to my library list
before using RUNJVA or going to Qshell so that I don't have to use
java.library.path property.

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)

TIA
Bruce


-----Original Message-----
From: Jim Mason <JEMason@compuserve.com>
To: INTERNET:JAVA400-L@midrange.com <JAVA400-L@midrange.com>
Date: Tuesday, March 13, 2001 10:53 AM
Subject: How to set up Library list for servlet on AS400?



Hi Bruce.

For JNI, a good way to specify the library list for an RPG program is:

supply the list in the java.library.path property.
You can modify the java.library.path property in QShell and from the AS/400
command line.

From the Qshell command prompt, type in:
java -Deja.library.path=/QSYS.LIB/MYLIB.LIB -Djava.version=1.2 myclass

Or, from the AS/400 command line, type in:
JAVA PROP((java.library.path '/QSYS.LIB/MYLIB.LIB') (java.version '1.2'))
myclass

Where /QSYS.LIB/MYLIB.LIB is the library that you wish to load using the
'System.loadLibrary()' call,
and myclass is the name of your Java application.

see the AS/400 Java manual:
AS/400 Developer Kit for Java for more on JNI...

Other options than JNI to call RPG programs from Java include:
1  JDBC stored procedures
2  Java toolkit program call class
3  Runtime.exec()

JNI is very good if you need to call specific procedures in an ILE service
program.  If you write RPG ILE service programs, you can call specific
procedures nicely.  Any of the other methods are easier to do than JNI BUT
only can call a program ( not a specific procedure ) passing parms and
receiving updated parms back.

JDBC stored procedures are excellent IF your RPG program should do some
complex processing and return a simple result set of rows for a client Java
application to process....

Hope this helps...

Jim Mason


Message text written by INTERNET:JAVA400-L@midrange.com
>
I am trying to use JNI to call RPG programs in servlet. I put the RPG
service program in library MYLIB. How do I include MYLIB in the "library
path" of the servlet so that servlets can find the service program?

TIA.

Bruce
<

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      Regards,
      Mandy Shaw

      Catalyst Solutions plc
      Kingfisher House
      Frimley Business Park
      Camberley
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      UK

      http://www.catalyst-solutions.com
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