eval {
            #call java jar file
        };
        if ($@){
            print " Getting error ...\n";
            if ( caught("java.lang.Throwable") ) {
                # have to save it; otherwise value will change after the following two lines
                my $exception = $@;
                my $msg = $exception->getMessage();
                my $string_writer = new java::io::StringWriter();
                my $print_writer = new java::io::PrintWriter($string_writer);
                $exception->printStackTrace($print_writer);
                my $line = $string_writer->toString();
                $errorLog->error($msg . "\n" . $line);
            }
            
        }