Eclipse can't find / load main class

Question

My Eclipse (Indigo) was running just fine. I created a simple class Hello. It is placed in package cont in the folder ch13. However

Answer 1

Note: This worked in the past and I received many up votes. Perhaps this is not a solution anymore - but it once was - as the eclipse version was indicated.

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Problem

This can also be caused by a Java Build Path Problem.

In my case, I had a an error:

A cycle was detected in the build path of project {project}. The cycle consists of projects {x, y, z}.

This can occur when you include other projects in the build path of the project you wish to run. In fact, all the projects will fail to run with the error Could not find the main class: Example.class

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Solution

Open

Windows -> Preferences -> Java-> Compiler -> Building -> Build Path Problems

Uncheck the Abort build when build path errors occur toggle

This seems like a can of worms if you end up with other build path errors I image. So use with caution.

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• Note: This only works if you have a "cycle error". This error message can be found in the "Markers" tab

I found the solution to this here

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Info

• Java 1.8.0_152
• Eclipse Photon (June 2018)