Eaglercraft 19 Launcher [upd]

If you are determined to play, here is the safest approach:

This is the most critical section. Let's separate fact from fiction. eaglercraft 19 launcher

Vanilla Minecraft 1.9 clients cannot connect to Eaglercraft servers, and vice versa. You are building a walled garden. If you are determined to play, here is

Click "Multiplayer" → "Add Server."