I've written a very basic XML RPC client in Perl (use RPC::XML) that is interfacing with a Java-based XML RPC server. Things work fine when the send_request method uses only strings. However, there is a particular server method that requires a java.lang.boolean type.

#!/usr/bin/perl

use strict;
use RPC::XML;
use RPC::XML::Client;

my @auth = qw(admin adminpass);

my $cli = RPC::XML::Client->new('http://172.18.1.1:2500/');

my $resp = $cli->send_request("XMLServerRPC.getEventLog", @auth);
print ${$resp} # Works FINE

my $resp = $cli->send_request("XMLServerRPC.getPlans", @auth, 1);
if ((ref $resp) eq 'RPC::XML::fault') {
    print "ERROR:  ${%{$resp}->{'faultString'}}"
} else {
    print ${$resp}
}
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The question is: what do I put in place of the '1' as the last arg to the second 'send_request("XMLServerRPC.getPlans", @auth, ???)'? The Java server expects a java.lang.boolean. I've tried:

1 : Error = expected java.lang.boolean not java.lang.integer
'1' : Error = expected java.lang.boolean not java.lang.string
'TRUE' : Error = expected java.lang.boolean not java.lang.string
pack("b*", 1) : Error = An invalid XML character (Unicode: 0x1) found
[download]

It seems that Perl is happily sending along the value as an integer or string. Since Perl doesn't have a native boolean type, I guess the real question is how do I create a Java type boolean in Perl?