Re: Weird IWS Bug (?)

From: Jon Paris <jon.paris@xxxxxxxxxxxxxx>
To: "Web Enabling the IBM i (AS/400 and iSeries)"

Date: 07/15/2019 07:48 PM
Subject: [EXTERNAL] [WEB400] Weird IWS Bug (?)
Sent by: "WEB400" <web400-bounces@xxxxxxxxxxxxxxxxxx>

Anyone seen this before?

I have a working REST/JSON Web Service generated by IWS (for the
curious Booth's challenge to me to find a better way to describe the
process than the current docs made me revisit it this weekend).

The service takes a URL of the form system stuff/sertvicename/cat/02
where cat is the parameter name and 02 is the value.

It works just fine but when there are less than the maximum number
of rows it outputs multiple empty elements.

To deal with this I added an extra parameter with array name_LENGTH
as the name and told the wizard to detect length.

Now here's the weirdness. When I invoke the service I get:

java.lang.RuntimeException: Invocation of program failed.
AS400Message (ID: CEE9901 text: Application error. MCH0603
unmonitored by RESTSRV4 at statement 0000000172, instruction
X'0000'.):com.ibm.as400.access.AS400Message@f9cb28fc
OK - let's debug that - I add a Service Entry Point and try again.
This time it doesn't "fail" it just produces rubbish output - like this:
{"RESULT":"","PRODUCTLIST_LENGTH":0,"PRODUCTLIST":
[{"PRODCD":"","PRODDS":"","CATCOD":"","STOH":0,"LNDCST":0.
00,"SELLPR":0.00,"DTLCHG":0,"DTLORD":0},
{"PRODCD":"","PRODDS":"","CATCOD":"","STOH":0,"LNDCST":0.
00,"SELLPR":0.00,"DTLCHG":0,"DTLORD":0},
{"PRODCD":"","PRODDS":"","CATCOD":"","STOH":0,"LNDCST":0.
00,"SELLPR":0.00,"DTLCHG":0,"DTLORD":0},
{"PRODCD":"","PRODDS":"","CATCOD":"","STOH":0,"LNDCST":0.
00,"SELLPR":0.00,"DTLCHG":0,"DTLORD":0},
...
{"PRODCD":"","PRODDS":"","CATCOD":"","STOH":0,"LNDCST":0.
00,"SELLPR":0.00,"DTLCHG":0,"DTLORD":0}]}
In other words the skeleton JSON but with no data!

How the hell can I debug something that "works" in debug and only
blows up when not?

Anyone seen this one before?