Java JAR 找不到主 class

Question

64x Intel processor
Kubuntu 19.04 on Linux 5.0.0-27
OpenJDK 1.8.0_222

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In the last hour I have set up my project folder, created scripts for automatic compiling and for back-ups etc...

Finally I got it working, I get the JAR file. The problem is that I can't run it. I know that this is very common problem, but I don't see any compiling errors, mistakes nor typos. I'm totally lost.

Even using java -jar TaskCalender.jar com.ydsoftware.taskcalender.EntryPoint and java -cp TaskCalender.jar com.ydsoftware.taskcalender.EntryPoint show the same error.

Error: Could not find or load main class com.ydsoftware.taskcalender.EntryPoint

My source file structure:

com
  ydsoftware
    taskcalender
      EntryPoint.java (contains main method)    

My JAR file structure:

META-INF
  MANIFEST.MF 
com
  ydsoftware
    taskcalender
      EntryPoint.class (contains main method)   

MANIFEST.MF contents (inside the JAR file):

Manifest-Version: 1.0
Created-By: 1.8.0_222 (Private Build)
Main-Class: com.ydsoftware.taskcalender.EntryPoint
Class-Path: lib/MX%20Engine.jar
/ blank /
/ blank /

Answer 1

Can you try below in CMD or through batch file as per your convenience

Generic: java -cp your_jar_name.jar package_name.classname

as per your class: java -cp TaskCalender.jar com.ydsoftware.taskcalender.EntryPoint

Answer 2

SOLVED

The problem was that Class-Path: lib/MX%20Engine.jar was missing because my computer had shut down unexpectably (because our power was cut off for some reason) and the changes to MANIFEST.MF were lost. Didn't even notice.

Still, it should say something along the lines of Class not found or unexcepted token instead of saying Could not find or load main class which made finding the problem harder.

Thank you to everyone who tried to help me!