PR https://github.com/netty/netty/pull/2827 addresses this issue
 @Scottmitch cherry-picked your change. Thanks!

.gitignore missing bin/ directory
The netty project's .gitignore is missing an entry for `bin/`.  This directory is created by eclipse and maintained by eclipse.  Even though the IDE of choice is intellij the .gitignore should have a `bin/` entry under the Eclipse section to exclude this directory.

.gitignore
.gitignore
diff --git a/.gitignore b/.gitignore
index 8a80d67d0d9..822e92dda03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 .project
 .classpath
 .settings
+bin/
 
 # IntelliJ IDEA project files and directories
 *.iml
