Can someone help me help my computer find the main class in java?

Question

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How to create a .jar file that actually runs?

The computer can't find the main class when I turn my classes into a jar file. I can run it from the command line but not by double clicking it! When i double click it, it says Can not find main class: robert.Start (Start is my main class!) Can someone help me please? I have a manifest file and everything and this is whats written in it

Manifest-Version: 1.0
Class-Path: .
Main-Class: robert.Start

And my directories are like this:

inside the Interest.jar there is:

META-INF

robert

Inside robert are my classes

Can someone help me please? even when i don't create the manifest file manually it still does not run!

I am using windows 7.

I figured out the problem. It is when i run the program with jre7 it doesn't work. BUT with jre6 it works fine! I wonder why :/

Did you manually create that manifest file? If so, what operating system are you using? — Jeffrey, May 21 '12 at 00:46
Operating system? How does that matter - this is Java, after all. — duffymo, May 21 '12 at 00:47
@duffymo It matters for the manifest file. The line terminators have to be exactly `\n`. — Jeffrey, May 21 '12 at 00:47
@Jeffrey I prefer to leave the manifest to Ant or some other tool that understands how to make them correctly - including adding the 'completely blank last line'. — Andrew Thompson, May 21 '12 at 01:07
So ***ask!*** There is no reason to believe you would understand the new answers given on a new thread, if you did not understand the earlier answers. As it is you are wasting both your time **and** ours. — Andrew Thompson, May 21 '12 at 01:21

score 0 · Answer 1 · answered May 21 '12 at 00:47

0

You didn't package robert.Start correctly.

Open the JAR and look for Start.class. When you find it, make sure that the path is robert. If it's not, you have your answer.

CLASSPATH could an issue as well. If you don't use the -cp option when you run, you'll have to have Class-Path set in the manifest as well.

answered May 21 '12 at 00:47

duffymo

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I tried that too but it still does not work! – mrspy1100 May 21 '12 at 01:08
That line was generated when eclipse made the MANIFEST.MF file. – mrspy1100 May 21 '12 at 01:11
@Jeffrey No it doesn't, it tells the JVM where else to look for classes that aren't in this JAR. – user207421 May 21 '12 at 01:12

Can someone help me help my computer find the main class in java?

1 Answers1