Calling Java main method in RPGLE

[subhashree]

Hi,

I am trying to call a Java Main method from my RPGLE program by using prototyping. But I am getting the following error.


Message . . . . : Parameter 1 received a Java exception on conversion to a
Java array (C G D F).

Cause . . . . . : RPG procedure APPJAVALE in program SPLIB/APPJAVALE
received Java exception java.lang.NoClassDefFoundError:
com/app/mad/digitalphotocard/actions/StartApplication when converting an
RPG parameter to a Java array. The error occurred for parameter number 1
for the call to Java method "main" in class
"com.app.mad.digitalphotocard.actions.StartApplica tion".

Any pointers to the cause and recovery of this error would be very helpful.

I think the cause of the problem is that the java main method:
public static void main(String[] args) is not being prototyped and called correctly in the RPGLE program. But I am not able to figure out the correct way. Please help.

Thanks,
Subha.

[kpmac]

Re: Calling Java main method in RPGLE

You cannot prototype the main method of a java program. If you are trying to execute the main you need to execute QCMDEXEC or use the system command as follows:

Hbnddir('QC2LE')
D  GoCmd          Pr            10I 0 Extproc('system')                                        
D    cmdString                    *   Value                                                    
D                                     Options(*String)                                         
D ReturnCode      S             10I 0   
D QUOTE             C                   const('''')                                                       
 /Free

    ReturnCode = GoCmd( 'RUNJVA CLASS(MyClass)'             +
                          ' PARM( ' +QUOTE+ parm1 +QUOTE+
                            +QUOTE+ parm2 +QUOTE+ 
                            +QUOTE+  parm3 +QUOTE+ ')'     ); 
    
    If ReturnCode = 0;
      Dsply 'Success';
    Else;
      Dsply 'Error';
    EndIf;

    *InLr = *On;
    Return;

 /End-Free 

[subhashree]

Re: Calling Java main method in RPGLE

Actually, its possible to prototype and call the Java main method. Just follow this link which tells how to call Java main methods from RPG. I have myself tried the programs in this web-page and I got the correct output.

http://www.itjungle.com/mgo/mgo082703-story02.html

Thanks,
Subha.

[kpmac]

Re: Calling Java main method in RPGLE

Wow, I did not know that.

Can you explain to me the benefits gained from prototyping the main method vs. invoking the application via runjva?

The example on the site seems more complicated to me and also creates numerous objects that need to be cleaned up afterwords.