RE: Error calling constructor from RPG

Barbara & Dan, thanks for your assistance.

I added an extra constructor that's called from the RPG where the Strings
are replaced by byte arrays as Barbara described below. The RPG call now
recognises the method signature and runs fine.

I have a second class which I'd like to call from RPG. It runs fine when
called from Qshell but behaves unexpectedly when called from RPG. The class
sends an MQ message. 

I'd like to track the logic when called from RPG by adding some
System.out.println markers so my question is: how can I view this output?

I don't want a screen break to the Java shell but would like the output
redirected to a file which could be either a QSYS physical file or a text
file in the IFS. If possible I'd prefer redirection by an override in the
job environment rather than amending Java source but can do that if now
other way.

Thanks,

Keith
 



 

-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-bounces@xxxxxxxxxxxx]

Sent: 03 August 2006 19:15
To: java400-l@xxxxxxxxxxxx
Subject: Re: Error calling constructor from RPG

*** WARNING : This message originates from the Internet ***

Dan Feather wrote:

I do things a little differently than what you have here. I actually 
define the string constructor as a procedure and create my own Java 
string objects in RPG, and then pass those. So, my procedure 
definition in this case would look a little different than yours. Where

you have:

D   source                       3A   CONST VARYING

I would have:
D   source                        O   CLASS(*JAVA : 'java.lang.String' )

Dan, that's the correct way to prototype a String parameter, except I would
add CONST to the prototype.  

"3A" doesn't match a String object; it only matches a Java byte array. 
See Table 30 here:
http://publib.boulder.ibm.com/infocenter/iseries/v5r4/topic/books_web/c09250
76171.htm#HDRINTRO_JAVA_RPG

Keith, rather than have your RPG program have to create all the String
objects to call your constructor with String parameters, it might be easier
to add another constructor to your Java classwith byte array parameters, for
your RPG programs to use.  Then your RPG program could use the prototype
with the A-type parameters.

Your extra constructor can call through to the other constructor using
"this" as the method name.

        // the constructor with byte[] parameters
        public MessageOut(int comp, int dept, byte[] source,
                byte[] groupCode, byte[] jobCode, byte[] pkgLib) {
            this(comp, dept, 
                 new String(source), new String(groupCode), 
                 new String(jobCode), new String(pkgLib));
        }

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