Fixing wall of net/protocol warnings

After upgrading to Rails 6.1.7.2 one of our apps printed a wall of warnings while booting:

/var/www/app/shared/bundle/ruby/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:68: warning: already initialized constant Net::ProtocRetryError
/home/deploy-app/.rbenv/versions/2.6.10/lib/ruby/2.6.0/net/protocol.rb:66: warning: previous definition of ProtocRetryError was here
/var/www/app/shared/bundle/ruby/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:214: warning: already initialized constant Net::BufferedIO::BUFSIZE
/home/deploy-app/.rbenv/versions/2.6.10/lib/ruby/2.6.0/net/protocol.rb:206: warning: previous definition of BUFSIZE was here
/var/www/app/shared/bundle/ruby/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:541: warning: already initialized constant Net::NetPrivate::Socket
/home/deploy-app/.rbenv/versions/2.6.10/lib/ruby/2.6.0/net/protocol.rb:503: warning: previous definition of Socket was here

We could fix this by adding the following to our Gemfile:

gem 'net-http', require: false
gem 'net-imap', require: false
gem 'net-protocol', require: false
gem 'net-smtp', require: false

Background

Alternative

Turned out that it was caused by an update of the mail gem from 2.7.0 to 2.8.0.1.
So another possibility would be to stay at version 2.7.0.

Henning Koch

makandra.de

Say thanks3

Last edit

2023-01-26

Florian Leinsinger

License

Source code in this card is licensed under the MIT License.

Posted by Henning Koch to makandra dev (2023-01-26 16:12)