To clarify:

I changed it from single requests to a server solutions with a dataq. The
dataq will be created only once a job.
This gave me a positive result, but still too less.

Core dates:
Box: IBM i9, single core, 32 MB mem, V7R4
Java: JVM Java 8SE 32 bits
Code-Pics: 500 jpg / 90 sec. on IBM i vs. external webservice = 500
jpg / 35 sec.


-----Ursprüngliche Nachricht-----
Von: JAVA400-L [mailto:java400-l-bounces@xxxxxxxxxxxxxxxxxx] Im Auftrag von
Charles Wilt
Gesendet: Montag, 23. November 2020 20:55
An: Java Programming on and around the IBM i
Betreff: Re: Speed up Java on i

Is this a pure Java solution, or are you invoking Java from RPG for

In the past, I've found pure Java to be faster than trying to invoke from

What OS version? What Java version? 32/64 bit?

Have you tried to determine where the time is being spent?


On Mon, Nov 23, 2020 at 12:39 PM Logic IT: K. Fritz <k.fritz@xxxxxxxx>


I've a very special case of a customer.

Case: Printing a QR Code with the Swiss flag in the middle.

Printerfiles are not able to do that, QR-Codes yes, but not with an

So I've wrote a small ZXING Java program and a colleague a DataQ server
program to prevent multiple starts of the JVM.

But it's still too slow! For 1000 QR Codes needs my i9 3 Min and the
customer talks about 2 Million documents with a QR-Code.

How can I achieve much more speed to run the java prog?

This customer wants a full IBM i solution.

Who can give me a good advice.

Thanks and take care.


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