Listener in Testng - selenium

Question

I have created a listener class in my project. Now what I have read in web there are two methods to add a listener either to your class or to testng file.
Please check in the folder structure. For now, I m using it like this in my java class but it is giving me error as in image attached:
#Listeners({Test.tes.Utils.ListenerUse.class})

Answer 1

From your screenshots, I understand that your test class HomeTestCases.java resides in the package Test.test.MyHomepageTestCases in src/test/java
You are trying to refer to the listener ListenerToUse.java that resides in the package Test.tes.Utilsin src/main/java.
When you use #Listeners(Test.tes.MyHomepageTestCases.MyHomepageTestCases.ListenerToUse.class)
Here you are basically telling Java to look for the listener class ListenerToUse inside Test.tes.MyHomepageTestCases.MyHomepageTestCases (as a nested class), but that's not the case because ListenerToUse is NOT a embedded class inside MyHomepageTestCases.java.
To fix the problem please do the following:
Change: #Listeners(Test.tes.MyHomepageTestCases.MyHomepageTestCases.ListenerToUse.class)
To: #Listeners(Test.tes.Utils.ListenerToUse.class)

Answer 2

I think the issue is you're mixing the package of your Listener, and the package of the class where you want to add it.
Your code now:
#Listeners(Test.tes.MyHomePageTestCases.MyHomePageTestCases.ListenerUse.class)
Correct package:
#Listeners(Test.tes.Utils.ListenerUse.class)
However, you've named your package "Test", which is (besides breaking Java naming conventions -> https://docs.oracle.com/javase/tutorial/java/package/namingpkgs.html) clashing with the TestNG Test class. On your screenshot, I can see that "Test" is grayed out. If you hover with your mouse over it, you'll probably see Eclipse has resolved it as "org.testng.annotations.Test". So you have two options:
Name your packages properly and try again
Expand the imports sections of your HomeTestCases class; manually add:
import Test.tes.Utils.ListenerUse;
and delete the following:
import org.testng.annotations.Test;