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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.

Logan
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  • Please post the command you use to 'run' the application (like: `java -jar myjar.jar`) as there are 'millions' of reasons why running a jar could fail. – Andreas Dolk Jun 14 '10 at 09:29

3 Answers3

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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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Glorfindel
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VonC
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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.

Andreas Dolk
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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.

kgiannakakis
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