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Internal compiler produces an error. [message #812296]

Sat, 03 March 2012 15:23

Adam Smith

Messages: 4
Registered: March 2012

Junior Member

Hi,

I've recently been using the eclipse IDE to develop in java. My program runs fine from within eclipse and even works fine after I compile and launch through cmd. However, after I compile into .jar and then try to launch through the actual .jar. I get the error: Could not find the main class: *filepath* Program will exit.

I've searched about this and it looks like a lot of people have had the same error, but I never found an actual fix. Equally, I've tried messing around with the manifest file etc. to no avail.

Adam

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Re: Internal compiler produces an error. [message #812303 is a reply to message #812296]

Sat, 03 March 2012 15:35

Olivier Thomann

Messages: 518
Registered: July 2009

Senior Member

This has nothing to do with the compiler. You need to properly set up the MANIFEST.MF file to specify what is the main class.
There is a way to specify that using the export as jar.
--
Olivier

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Re: Internal compiler produces an error. [message #812307 is a reply to message #812303]

Sat, 03 March 2012 15:42

Adam Smith

Messages: 4
Registered: March 2012

Junior Member

I went through that and told eclipse to generate the manifest file, but that didn't work either.

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Re: Internal compiler produces an error. [message #812380 is a reply to message #812307]

Sat, 03 March 2012 18:26

David Wegener

Messages: 1445
Registered: July 2009

Senior Member

On 03/03/2012 09:42 AM, Adam Smith wrote:
> I went through that and told eclipse to generate the manifest file, but
> that didn't work either.

Does the Main-Class entry in your manifest file match the fully
qualified name of your main class?

Does the jar file include your main class?

Make sure you launch your class at least once in Eclipse.

Select File->Export->Runnable Jar File.

Select the launch configuration used to launch our class at the top of
the wizard.

Enter the destination for the jar file including the filename.jar

Click Finish.

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Re: Internal compiler produces an error. [message #812451 is a reply to message #812380]

Sat, 03 March 2012 21:08

Adam Smith

Messages: 4
Registered: March 2012

Junior Member

David Wegener wrote on Sat, 03 March 2012 13:26

On 03/03/2012 09:42 AM, Adam Smith wrote:
> I went through that and told eclipse to generate the manifest file, but
> that didn't work either.

Does the Main-Class entry in your manifest file match the fully
qualified name of your main class?

Does the jar file include your main class?

Make sure you launch your class at least once in Eclipse.

Select File->Export->Runnable Jar File.

Select the launch configuration used to launch our class at the top of
the wizard.

Enter the destination for the jar file including the filename.jar

Click Finish.

Tried your suggestions but it hasn't worked. The manifest file shows the classpath of the main class so I don't get why it's not working. It runs perfectly in eclipse too.

[Updated on: Sat, 03 March 2012 21:15]

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Re: Internal compiler produces an error. [message #813328 is a reply to message #812451]

Mon, 05 March 2012 05:37

Satyam Kandula

Messages: 444
Registered: July 2009

Senior Member

Did you verify if the *filepath* really exist in the jar?

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Re: Internal compiler produces an error. [message #814483 is a reply to message #813328]

Tue, 06 March 2012 14:02

Adam Smith

Messages: 4
Registered: March 2012

Junior Member

Yeah, that's just the filepath of the .jar.

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Re: Internal compiler produces an error. [message #814753 is a reply to message #814483]

Tue, 06 March 2012 21:12

David Wegener

Messages: 1445
Registered: July 2009

Senior Member

Have you actually opened the jar file and looked at the contents?

Post the Manifiest file from the jar file along with the jar file content hierarchy.

What is the command you are using to run the jar file?

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Re: Internal compiler produces an error. [message #816205 is a reply to message #812296]

Thu, 08 March 2012 14:52

Harutyun Arzumanian

Messages: 35
Registered: February 2012

Member

In the manifest file put the following:

Class-Path: Library.jar

This document gives more details:
Jar Deployment
To create a jar using the a manifest file named MANIFEST, you can use the following command:

jar -cmf MANIFEST MyJar.jar <class files>

If you specify relative class-paths (ie, other jars in the same directory), you can move the jar's around
Then run the jar like this:

java -jar MyJar.jar

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