SOAP::Lite under mod_perl is pretty straight forward. The big contrast here is that mod_perl runs in the Apache server process so there's no decoupling here of the HTTP server from the application; a very different paradigm from running in a servlet container.

Put this in httpd.conf:

PerlRequire /usr/local/modperl/conf/startup.pl
# simply has
# use lib qw(/perl/services/lib);
# 1;

  SetHandler perl-script
  PerlHandler Apache::SOAP
  PerlSetVar dispatch_to "/perl/services/lib, HelloServer"