RE: Debugging Java programs on the ISeries

["Gary L Peskin" <garyp@xxxxxxxxxxxx>]

For another approach, you might want to consider setting the
QIBM_CHILD_JOB_SNDINQMSG environment variable.  This works for all spawned
processes, not just JVMs.  This is also helpful when debugging shell scripts
executed via STRQSH(command).

http://publib.boulder.ibm.com/iseries/v5r1/ic2924/info/rzaha/qibmenv.htm

> -----Original Message-----
> From: java400-l-bounces@xxxxxxxxxxxx 
> [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of 
> pekrzyz@xxxxxxxxxxxxxxx
> Sent: Friday, July 04, 2003 9:30 AM
> To: java400-l@xxxxxxxxxxxx
> Subject: Re: Debugging Java programs on the ISeries
> 
> 
> I've also been to hell and back trying to debug Java programs 
> on the AS400 
> but I finally got it to work.  I was calling a Java program 
> from RPG, and 
> I wanted to debug the Java code that was being remotely 
> called from the 
> RPG.  I was using STRSRVJOB on another session so that I 
> could remotely 
> debug the Java code.  I needed to be able to debug my Java 
> class on the 
> AS400, not on a Windows box running a remote debugger.
> 
> What I found out was the following:
> 
> When you try to debug a Java class using the STRDBG command 
> on the AS400, 
> the command doesn't work unless the JVM is already running 
> and your class 
> is loaded. 
> 
> I found that I was constantly getting the error 'Java class file not 
> available.' I even tried the full pathname (eg. 
> /home/myjava.class) but it 
> didn't work even though I did have my environment CLASSPATH 
> variable set 
> properly.   I pressed F1 to get a further explanation on the 
> error and 
> found out that the reason code returned was 1 for '1 - Java virtual 
> machine not started.'.
> 
> Once my RPG program was loaded and had started the copy of my 
> Java class, 
> I was then able to debug the Java Code, since the JVM was now 
> running.  I 
> also learned quickly that you have to match exactly, the name 
> of the class 
> in the STRDBG command matching upper and lower-case 
> characters.  As well, 
> you don't enter in the extension of class.  So my class name 
> 'OraCon.class' was entered in as OraCon.
> 
> Another trick I used was to set a breakpoint in my RPG code 
> to break at 
> the point where the Java class was instantiated.  Once the 
> program hit 
> this breakpoint, I then used F14 from within STRDBG and added 
> the Java 
> Class right after it was created.  I was then able to use Option 5 
> 'Display Module Source' and then set a break point in my Java 
> code and 
> then step through my Java class.
> 
> 
> ...Paul
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