Unable to load main-class for jar file.

Question

I have developed an application using Eclipse IDE. After creating the application I exported the project in jar format. When I am trying to run this jar file, I get the error: Unable to load main class. Please Help.

Answer 1

When you are exporting your project as a jar (see this SO question), you must specify your main class in the export Jar wizard.

Answer 2

This should work always:

java -cp MyJar.jar pkg.name.MyClass

I'd prefer this anyway because it causes less classpath trouble compared to the java -jar way of starting a java application.

Answer 3

You need to create a runnable jar file. From Eclipse 3.4 you can do that by choosing Export, Java, Runnable Jar File. If you also want to include dependencies have a look at the Fat Jar plug-in.