The definition of $href is outside the sub run_tests(). Move it inside and you might get more ... 
use Data::Dumper;

sub run_tests {
    my $href = shift;

    # by doubt always try to dump the data
    # print STDERR Dumper( $href );

    foreach my $test (keys %{$href}) {
        $log->info("running test $test with parameters $href->{$test}"
+);
    }
    exit;
}

[download]
Log by original code: 
2016/10/31 13:47:06 7732 [0] logger_1175005.pl 23 ess2_loader - loggin
+g successfully
2016/10/31 13:47:06 7732 [0] logger_1175005.pl 29 ess2_loader - trying
+ to spawn child for periodic check...
2016/10/31 13:47:06 7732 [11] logger_1175005.pl 31 ess2_loader - succe
+ssfully spawned PID -5796
2016/10/31 13:47:06 -5796 [11] logger_1175005.pl 34 ess2_loader - runn
+ing check as PID -5796

[download]
After var moved: 
2016/10/31 13:47:21 19276 [0] logger_1175005.pl 23 ess2_loader - loggi
+ng successfully
2016/10/31 13:47:21 19276 [0] logger_1175005.pl 29 ess2_loader - tryin
+g to spawn child for periodic check...
2016/10/31 13:47:21 19276 [14] logger_1175005.pl 31 ess2_loader - succ
+essfully spawned PID -5168
2016/10/31 13:47:21 -5168 [14] logger_1175005.pl 34 ess2_loader - runn
+ing check as PID -5168
2016/10/31 13:47:21 -5168 [19] Tools.pm 22 Tools.run_test - running te
+st baz with parameters foobar
2016/10/31 13:47:21 -5168 [19] Tools.pm 22 Tools.run_test - running te
+st foo with parameters bar

[download]

In reply to Re^3: Gettign a logger with Log::Log4perl by duyet
in thread Gettign a logger with Log::Log4perl by nikmit

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