soap lite pass string argument - web-services

Question

I have a problem passing a string argument using Perl. The following code
#!/usr/bin/perl -w
use SOAP::Lite;
my $service = SOAP::Lite->service('http://localhost:8080/greeting?wsdl');
print $service->greetClient('perl wooooo'), "\n";
Results in
Greeting null! Have a nice day...
A similar python code
from suds.client import Client
client = Client('http://localhost:8080/greeting?wsdl')
print client.service.greetClient('python wooooo')
works perfectly
Greeting python wooooo! Have a nice day...
I tried to set different encodings
print $service->encoding('utf-8')->greetClient("perl wooooo"), "\n";
with the same result.
A SOAP Monitor shows that there is no arg0 in a case of Perl
<greetClient xsi:nil="true" xsi:type="tns:greetClient" />
which is present in a case of Python
<ns0:greetClient>
<arg0>python wooooo</arg0>
</ns0:greetClient>
What can be a problem?
Why it's so complicated to implement a SOAP client with Perl compared to Python?
EDIT:
SOLUTION
Finally the following solution is working
#!/usr/bin/perl -w
use strict;
use warnings;
use XML::Compile::SOAP11;
use XML::Compile::WSDL11;
use XML::Compile::Transport::SOAPHTTP;
my $soap = XML::Compile::WSDL11->new('c:/temp/greeting.wsdl');
my $call = $soap->compileClient('greetClient');
print $call->(arg0 => 'perl wooooo'){'greetClientResponse'}{'return'}, "\n";

Answer 1

SOAP::Lite can be infuriatingly bad. You might give XML::Compile::SOAP a try:
use strict;
use warnings;
use XML::Compile::SOAP11;
use XML::Compile::WSDL11;
use XML::Compile::Transport::SOAPHTTP;
my $soap = XML::Compile::WSDL11->new(
'http://localhost:8080/greeting?wsdl',
schema_dirs => [
'c:/soft/Perl/site/lib/XML/Compile/SOAP11/xsd'
'c:/soft/Perl/site/lib/XML/Compile/XOP/xsd'
'c:/soft/Perl/site/lib/XML/Compile/xsd'
]
);
$soap->compileCalls;
my ( $response, $trace ) = $soap->call( 'greetClient', arg0 => 'perl wooooo' );
$trace->printResponse;
$response will be the call response converted to a hashref via XML::Simple, which may be all you need. The $trace object is handy to see what the raw XML response looks like.

Answer 2

Unfortunately, I can't see your WSDL.
But in regards to SOAP::Lite, I don't see you setting up neither a proxy (endpoint) nor an uri.
You're also probably going to have to change the on_action behavior as well. By default, SOAP::Lite wants to use the '#' concatenation.
So something along these lines might work.
$service->proxy( $uri_of_my_end_point );
$service->uri( $schema_namespace );
$service->on_action( sub {
my ( $uri, $method ) = #_;
my $slash = $uri =~ m{/$} ? '' : '/';
return qq{"$uri$slash$method"};
});