Java launch error selection does not contain a main type

Question

I am a total newbie in Java and Eclipse. I googled for lots of help but still confused. From Eclipse I click run then choose Java application and I get this error immediatel

Answer 1

I also experienced this problem and could solve it. The solution was not mentioned yet.

In my case I'm working in Eclipse with Xtend and I converted the project to maven. After that there was a source-exclusion entry in your classpath file:

Then you just need to delete this line and do a clean build.