[erlang-questions] X gen_server also died when monitored Y gen_server died. why?

[I Gusti Ngurah Oka Prinarjaya]

Hi,

I create two gen_server. Let's say X gen_server, and Y gen_server.

X gen_server do monitoring using erlang:monitor/2 to Y gen_server.
When i do Y:stop(). X gen_server also died.

I want to *X gen_server still alive* even monitored Y gen_server is died.

This is X gen_server https://pastebin.com/G2xDNxMf
This is Y gen_server https://pastebin.com/hWUfUPmn

This is the result when i run my code

1> oka_oprek_agensrv:start_link().

{ok,<0.86.0>}

2> oka_oprek_agensrv:start_bgensrv().

{ok,start_bgensrv,

    {<0.84.0>,#Ref<0.1555235413.310640643.180158>}}

3> oka_oprek_agensrv:hello().

{ok,hello,{<0.84.0>,#Ref<0.1555235413.310640643.180166>}}

4> oka_oprek_bgensrv:hello().

{ok,hello_from_b,

    {<0.84.0>,#Ref<0.1555235413.310640643.180173>}}

5> oka_oprek_bgensrv:stop().

Monitored process died. Ref=#Ref<0.1555235413.310640643.180161>,
Pid=<0.88.0>

** exception exit: {normal,{gen_server,call,[bgensrv,stop]}}

     in function  gen_server:call/2 (gen_server.erl, line 215)

6> oka_oprek_agensrv:hello().

** exception exit: {noproc,{gen_server,call,[agensrv,hello]}}

     in function  gen_server:call/2 (gen_server.erl, line 215)

7>


Please enlightenment



Thank you
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://erlang.org/pipermail/erlang-questions/attachments/20190603/3200f975/attachment.htm>