Selenium WebDriver || TestNG Introduction Part - 1

If I am running LoginPageTest Class that has testCase, I have no issues.

As I create another class (MaintenanceClass) within the same package and call loginPageTest class I get NullPointerException. Any thoughts ?

I want to get training by you. sir how can I contact you?

where is the part2? i can't find that ,please provide me url if anyone knows

Where is part 2 of this ? I can find it. Please upload