Error when double-clicking a jar file

[Atynine]

Alright, so I had Eclipse generate a jar file for my mini-game, but when I double click it, it returns

Could not find main class: Main. Program will exit.

On the other hand, when I run it from the command line, it runs perfectly fine. There is a Manifest file with the correct main class put in it, so that's ruled out as a possibility.

Any Ideas?

[pbrockway2]

There is a Manifest file with the correct main class put in it, so that's ruled out as a possibility.

If the jar's manifest correctly identifies a jar entry as the entry point to your program then it's the error message that's ruled out as a possibility.

[Atynine]

To clarify, I used

java -jar Game.jar

and it runs perfectly, but double-clicking doesn't

[Atynine]

Okay, while going through the Similar threads, I got that I needed to do

"C:\Program Files\Java\jdk1.6.0\bin\javaw.exe" -jar "%1" %*

in the command prompt, but after trying that, it tells me "Error: unable to access jarfile %1"

[pbrockway2]

Where did you see the error message when you double clicked the jar file?

And, yes, what is the contents of its manifest and the location and contents of the class it specifies as the entry point?

[pbrockway2]

What you posted in #4 doesn't look like what you'd type at the command prompt (and I'm confused: I thought you said it was already running fine from the command line.)

Rather it looks like an action you would associate jar files with in WindowsExplorer. On XP you get at these from "Tools->Folder Options->File Types".

[Atynine]

Yeah, it runs fine from the cmd, that was just one of the answers in the similar threads.
The message when I double clicked the jar file popped up in a Java Virtual Machine Launcher thing.
The contents of the Manifest are

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

And the entry point is Main.class

[pbrockway2]

The message when I double clicked the jar file popped up in a Java Virtual Machine Launcher thing.

That's strange. I don't get any launcher on this machine (XP/JRE7). The default behaviour if it can't find or load the main class is basically to do nothing.

Did you change the action associated with opening jar files as suggested in #4. That's the default for Windows. (Of course you have to set the correct path to javaw.exe for however you have installed.)

[Norm]

You have determined that the jar file contents are ok by being able to execute it from the command prompt with the command :
java -jar Game.jar
as posted in post#4.

So the problem must be with what the OS is using as a commandline when you double click on the jar file.

[Atynine]

You have determined that the jar file contents are ok by being able to execute it from the command prompt with the command :
java -jar Game.jar
as posted in post#4.

So the problem must be with what the OS is using as a commandline when you double click on the jar file.

How do I change that?

[Norm]

What version of Windows are you using? The change is easier on XP (see post #6) than on Windows7 where you will have to use the regedit program.

[Atynine]

Windows 7

[Norm]

I've used the regedit program to fix the commandline associated with a file extension. It allows you to edit and change the registry. If you mess up the registry, you can hurt the OS.
Ask Google about how to use regedit and see what tutorials are available.

[Atynine]

Alright, Thanks

[DarrylBurke]

There are various third party tools for fixing file associations in Win7. This one's free: Types

Disclaimer: I haven't tested any of said tools nor researched reviews.

db