Good day, This is my first day of Minecraft plugin development, so sorry for this noob question. I'm working with meta, I need to include one double value to fired arrow. I have separated class for my onEntityShootBow method (@EventHandler). I have tried this: Code (Text): e.getProjectile().setMetadata("damageMultiplier", new FixedMetadataValue(new Main(), damageMultiplier)); but it results in Java.lang.IllegalArgumentException: Plugin already initialized! So, my question is, how can I pass my Plugin instance into Listener? I have tried to change Listener's method signature (adding Plugin pl parameter) but that resulted in Error: plugin tried to register Listener with invalid signature... Any ideas ?