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executing system() from WF

LooseCannon

Hi All -

I'm trying to execute a JAVA program from a WF...

The program doesn't run and I get a exit value of 139, which is useless to me.

Just to make sure all paths were correct, etc..., I copied the results of printing the variable '$cmd' - pasted and ran on the cmd line and the JAVA program ran successfully.

How/where can I find the meaning of the returned exit value.

Any debugging ideas are appreciated. Thanks.

#------- SNIPPET---------
system($cmd);
$return_value = $?;
$exit_value = $? >> 8;
$signal_num = $? & 127;
$dumped_core = $? & 128;
print OFILE "return_value = $return_value\n";
print OFILE "exit_value = $exit_value\n";
print OFILE "signal_num = $signal_num\n";
print OFILE "dumped_core = $dumped_core\n\n\n";
#------- SNIPPET---------

#---- OFILE ----------
return_value = 35584
exit_value = 139
signal_num = 0
dumped_core = 0
#---- OFILE ----------

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Comments

james1

JVMs are very sensitive to environment variables. You should compare environment variable values from within your WF Perl script and from within your command line environment.

-- James

--
James H Koh
Interwoven Engineering

Adam Stoller

repeated from my response to the same post in the Content Management form
$? is used for the return status from pipes and backticks (and qx())

If you are using system() - you should use the returned value directly.

my $cmd = "some-clt-with-parameters"; 
my ($results, $status) = ('', 0); 
if (use-backticks){ 
    $results = `$cmd 2>&1`; 
    $status = $? >> 8; 
}
elsif (use qx){ 
    $results = qx($cmd 2>&1); 
    $status = $? >> 8; 
}
elsif (use a pipe){ 
    if (open(PIPE, "$cmd | 2>&1")){ 
        local $/; 
        $result = <PIPE>; 
        close(PIPE); 
    }
    $status = $? >> 8; 
}
elsif (use system){ 
    $status = system($cmd); 
    $status >>= 8; 
}

Hope that helps

--fish
(Interwoven 5.5.2 Certified, Senior Technical Consultant)

LooseCannon

Thanks James, fish -

$results = `$cmd 2>&1`;

printing $results gives me the error message "Segmentation Fault"...which, I think, means that the program is trying to access memory that hasn't been allocated to it.

Any ideas about why I only get this error when running the program from a WF? will increasing memory available to the JVM resolve the problem?

herald10

Usually a segmentation fault occurs when the Java program is trying to access an index that is invalid. Please make sure the java program doesn't contain any logical errors sometimes that throws the segmentation fault.

james1

I've never seen an index access cause a JVM to seg fault; I've only ever seen them cause an ArrayOutOfBoundsException.

-- James

--
James H Koh
Interwoven Engineering

LooseCannon

herald10,

The Java app runs fine from a shell script, perl file, or cmd line...just not from the WF, so I don't think this is the problem

Adam Stoller

If you're running from a script within a workflow context - make sure the environment information is set correctly - in this case - make sure the classpath and any other assorted java environment variables are set the same way they are when you run from outside the workflow context.

--fish
(Interwoven 5.5.2 Certified, Senior Technical Consultant)

LooseCannon

Problem resolved...not sure why though, but at this stage of my project the why's aren't as important ;-)

I ended up pointing the app to a different JVM, I was using Interwovens before, and increased the JVM's initial and maximum heap size up.

Thanks to all who took the time to assist me.