Call Java Pgm. from RPG in Submit???

[Martin St?berl]

Hi together!

I am trying to call a Java Pgm. from RPG in Submit using QCMDEXC. In
QPRINT Spoolfile I always get the following error:

java.lang.NoClassDefFoundError
java/lang/Throwable.<init>()V+4 Throwable.java:78)
java/lang/Error.<init>()V+1 (Error.java:37)
java/lang/NoClassDefFoundError.<init>()V+1
NoClassDefFoundError.java:33)
java/lang/ClassLoader.defineClass(Ljava/lang/String;[BIILjava/security/ProtectionDomain;)Ljava/lang/Class;+79
(ClassLoader.j
java/security/SecureClassLoader.defineClass(Ljava/lang/String;[BIILjava/security/CodeSource;)Ljava/lang/Class;+27
(SecureCla
java/net/URLClassLoader.defineClass(Ljava/lang/String;Lsun/misc/Resource;)Ljava/lang/Class;+196
(URLClassLoader.java:287)
java/net/URLClassLoader.access$300(Ljava/net/URLClassLoader;Ljava/lang/String;Lsun/misc/Resource;)Ljava/lang/Class;+1
(URLCl
java/net/URLClassLoader$ClassFinder.run()Ljava/lang/Object;+42
(URLClassLoader.java:594)
java/net/URLClassLoader.findClass(Ljava/lang/String;)Ljava/lang/Class;+16
(URLClassLoader.java:200)
java/lang/ClassLoader.loadClass(Ljava/lang/String;Z)Ljava/lang/Class;+41
(ClassLoader.java:303)
sun/misc/Launcher$AppClassLoader.loadClass(Ljava/lang/String;Z)Ljava/lang/Class;+33
(Launcher.java:286)
java/lang/ClassLoader.loadClass(Ljava/lang/String;)Ljava/lang/Class;+1
(ClassLoader.java:259)
java/lang/ClassLoader.loadClassInternal(Ljava/lang/String;)Ljava/lang/Class;+1
(ClassLoader.java:319)

The Submit Job works from the programmer's menue, but not from RPG via
QCMDEXC. I also tried to set the CLASSPATH System variable, using QSH
and the JAVA command. Also tried to call the Java programm directly
without a Submit Job from RPG. Always the same error!
The call from RPG programm works under V4R2 but not on V5R2!
Any hints what the problem could be?

cu

Martin

[Jack Kingsley]

martins...@gmx.de (Martin St?berl) wrote in message news:<1f43f74e.03101...@posting.google.com>...

Is it a compiled java program?? Is it in the IFS?? What does the
joblog look like from the one that does run. Sounds like you might be
missing a library in your library list.

[Dieter Bender]

Hi,

looks like classpath problems. Did you try
qsh cmd('java MyClass -classpath MyClassPath') ?

Dieter

[Dan Hicks]

The "class" you're trying to execute isn't a valid class. Maybe you
FTPed it without specifying "binary"?

--
Dan Hicks
Hard work never killed anybody, but why take a chance?

[Martin St?berl]

> Is it a compiled java program?? Is it in the IFS?? What does the
> joblog look like from the one that does run. Sounds like you might be
> missing a library in your library list.

Yes, I transfered the program through iSeries Navigator to a folder in
the IFS and compiled it in QSH. I don't get a joblog from the RPG
program, the only message I get is in the QPRINT spool file I printed
in the previous posting. Do I need a special library list for my job
to call a java program?

cu

Martin

[Martin St?berl]

> looks like classpath problems. Did you try
> qsh cmd('java MyClass -classpath MyClassPath') ?

Yes, I tried the same command in QSH with the Classpath Option and it
works. When I call the Java program from RPG I get the error. Also
tried setting the Classpath as a system value, so I don't have to use
the classpath option in QSH. It works when I use QSH manually, but it
fails when I call the java program from RPG.
Can I also set a system value like 'MYCLASSPATH' and use the option in
QSH like java -classpath MYCLASSPATH or do I have to use the variable
'CLASSPATH'?

cu

Martin

[Martin St?berl]

> The "class" you're trying to execute isn't a valid class. Maybe you
> FTPed it without specifying "binary"?

I transfered the *.java file via iSeries Navigator to the IFS and
compiled it in QSH. The Java programm works when I call it manually
from the programmer's menue for example. The error only occurs when I
call it from an RPG program and also only under V5R2, under V4R2 the
program works without a problem.

cu

Martin

[Dieter Bender]

Martin,

Martin St?berl wrote:

Best way in my opinion is to specify the classpath explicit in the java
command:
for example:
java myClass -classpath /home/dieter/java:/home/dieter/java/jt400.jar
with /home/dieter/java is the location of my classes
and the Toolbox Driver is in /home/dieter/java in jt400.jar (if I need it)
test this command from QSHELL if it works then:
qsh cmd('java myClass -classpath
/home/dieter/java:/home/dieter/java/jt400.jar')
executed via SBMJOB or QCMDEXC or whatever you want.

Dieter
>
> cu
>
> Martin

[Matthias]

Hello,

have your tried to set the HOME variable with WRKENVVAR for *JOB and
*SYS ? Also you can create a profile file in /etc with CLASSPATH
informations. Maybe this helps.

Best regards,
Matthias

On 14 Oct 2003 04:40:32 -0700, martins...@gmx.de (Martin St?berl)
wrote:

[Dr. Ugo Gagliardelli]

Maybe it's a classpath problem. Try putting your .jar file (or .class) in
/QIBM/UserData/Java400/ext directory, it's the right place to put your java
programs getting rid from classpath problems. Then simply call JAVA
CLASS('YourPackage.YourClass')
--
Dr.Ugo Gagliardelli,Modena,ItalyCertifiedUindoscrasherAñejoAlcoolInside
Spaccamaroni andate a cagare/Spammers not welcome/Spammers vão à merda
Spamers iros a la mierda/Spamers allez vous faire foutre
Spammers loop schijten/Spammers macht Euch vom Acker

[Martin Stöberl]

> Maybe it's a classpath problem. Try putting your .jar file (or .class) in
> /QIBM/UserData/Java400/ext directory, it's the right place to put your
java
> programs getting rid from classpath problems. Then simply call JAVA
> CLASS('YourPackage.YourClass')

I will try this out within the next days, at the moment I have to work on
another program ... I will also try to modify the java system environment in
file SystemDefault.properties.

cu

Martin

[Martin Stöberl]

> have your tried to set the HOME variable with WRKENVVAR for *JOB and
> *SYS ? Also you can create a profile file in /etc with CLASSPATH
> informations. Maybe this helps.

Hmm, I found an article at iSeries Information Center about setting up the
java system properties ... perhaps I find the problem here.
The curious thing is that I can call the the program in Submit from a normal
command prompt, but when I use QCMDEXC from an RPG program I get the error.

cu

Martin

[Martin Stöberl]

Today I had time to continue working on the problem. I think it's definitly
no classpath problem! It's no problem to call the java program from a
command prompt (doesn't matter if I use QSH, JAVA or RUNJVA) or from a CL
(can also use QCMDEXC here) in Submit or Interactive. The problem only
occurs when I call it from an RPG program with QCMDEXC. At the moment I
solved the problem by writing a small CL expecting two paramters, one for
the command and one for the length. Then I use QCMDEXC to start the java
program ("CALL 'QCMDEXC' PARM(&CMDEXC &CMDLEN)").
I found a posting in a forum (don't remember the link at the moment) from
someone who wrote that the problem could be that I am not allowed to start a
new thread from the RPG program!? Anyone here who knows more about this?

cu

Martin

[amw...@gmail.com]

Have you found any way around this? I have the same problem.

[Aaron]

A word of caution about calling Java from batch. Unless you use JNI
from and RPGLE program, the java program will spawn a new job in the
same subsystem your batch job is running. This can be a problem if you
have a limited number of jobs that can be active in the subsystem. The
java program will fail to run. It's really annoying.