An exception occurred while running MapReduce task today:
at first, I thought it was my JDK version. The JDK version of Linux was 1.8 and my windows JDK version was 11.0. I changed the JDK environment variable to 1.8, but the problem remained the same after running.

Later, I checked the size of the jar package and found that it was 0kb. Er… I checked the size of other jar packages, no problem. Then I think the jar package is damaged
I transported it through the window again, and it can succeed later

I hope this article is helpful to you~