I have this problem when I try to export runnable jar. I'm using eclipse oxygen and JDK 9.
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In NetBeans (another IDE) there's a command (menu option) to set the main class. You'd have to do something similar in Eclipse. Google for that phrase plus "Eclipse" and see what comes up. – markspace Nov 05 '17 at 16:11
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Better to bring the code here. – kolossus Nov 05 '17 at 16:11
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Possible duplicate of ["Could not find main method from given launch configuration" when using Java+Scala+Slick2D](https://stackoverflow.com/questions/13527869/could-not-find-main-method-from-given-launch-configuration-when-using-javasca) – Amit-Kumar-G Nov 05 '17 at 16:28
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Read the [comments here](https://stackoverflow.com/questions/46475709/java-9-eclipse-4-7-portable-export-error-resource-not-found-could-not-find-m) as well. – Naman Nov 10 '17 at 01:39
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I think this is a new Oxygen problem. I have the same one. I have tried to put a mainfest.fm file in the project, but eclipse ignores it. Export a jar allows you to select the manifest file and puts it in the jar, puts a blank one in the META-INF dir. Export executable jar builds a 1KB file with only a blank manifest file. – cliff2310 Jun 10 '18 at 23:17