Unable to load main-class for jar file

I have developed an application using Eclipse IDE. Aft开发者_JAVA技巧er 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.

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

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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.

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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.