RE: Defining System.out.println in RPG

I haven't tried this but it seems to be complaining about not finding
java.lang.System.out Do you need a CLASS qualifier on the EXTPROC that
points to the class? e.g  CLASS(*JAVA : 'java.lang.System.out').  You think
the Java system files would already be referenced.

Its a WAG.

Pete Helgren
Value Added Software,Inc.


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of Bramley, Stu
Sent: Thursday, March 04, 2004 3:43 AM
To: 'rpg400-l@xxxxxxxxxxxx'
Subject: Defining System.out.println in RPG


I'm trying to put together some 'Hello World' code that will call the Java
method System.out.println(String) from RPG - however I'm struggling to get
this defined correctly in the RPG..

I have tried the following :

 * Define the Java String Object
D StringObj       S               O   CLASS(*JAVA : 'java.lang.String')

 * Procedure to create String object
D newString       PR              O   EXTPROC(*JAVA:'java.lang.String':
D                                     *CONSTRUCTOR)
D                                     CLASS(*JAVA:'java.lang.String')
D charParm                     100A   CONST VARYING

D println         PR                  EXTPROC(*JAVA :
D                                     'java.lang.System.out':
D                                     'println')
D                                     STATIC
D inString                        O   CLASS(*JAVA : 'java.lang.String')

C                   EVAL      StringObj = newString('Hello World')

C                   CALLP     println(StringObj)

C                   EVAL      *INLR = *ON
C                   RETURN


This causes the RPG to fall over - the error is
"java.lang.NoClassDefFoundError: java/lang/System/out" when calling method
"println" with signature "(Ljava.lang.String;)V" in class
"java.lang.System.out"."

This indicates to me that the definition of println is wrong - it is looking
for a Java Class called Java.lang.System.out, but the Class is
java.lang.System - which has a public static final PrintStream object data
member. That seems a fair enough error... but I can't determine from any of
the manuals how to correctly define the call to the 'println' method on the
public static final java.io.PrintStream out member of the System class... I
don't think that I should need an object reference to call a static method -
but I can't find a syntax that will let me define it... does anyone know how
to do this?

Cheers
Stu

Stuart Bramley
Senior Technical Developer
Skandia Life::GroupIT
Southampton
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