3 ways to solve Eclipse - main class not found error

Like many Java programmers who gets "Error: Could not find or load main class Main" while running Java program in Eclipse, I was also getting the same problem recently. The "Error: Could not find or load main class" was rendered me puzzled even after my 10+ years of experience with Java errors and exceptions. Whenever I run my Java application either by Run configurations or right click and run as Java program, I get an annoying popup complaining about "could not find or load the main class, the program will exit". I checked, the project was compiling fine, I can see the .class file for the main class in the bin directory of Eclipse, and I can even see the project and output folder added on the classpath of Run configuration, but still I am getting the "could not find main class, program will exit error".

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