%hash = ( 'class_name' => { 
			   'list_of_successful_jobIDs' => [ qw(foo bar) ],
			   'list_of_failed_jobIDs'     => [ qw(val1 val2) ],
		          },
);

##</code><code>##

print $hash{class_name}{list_of_successful_jobIDs}[1];