Trouble running a .jar file

[Stephanie Challand]

I am hoping someone can help me out with this.

I have a small app that I created a .jar file from so that it can be run by double-clicking on that. It has been working perfectly fine for everyone until this week. I have one person who gets a java.lang.noclassdeffounderror when trying to run it that way. I was able to create a cmd file that runs the .jar and that works fine. So what am I missing in my creation of the .jar that is not allowing it to run for this one person?

The .cmd file contains the following:

"c:\Program Files\Java\jdk1.6.0\bin\java" -jar "C:\Users\XXXXX\Desktop\app dir\jarname.jar"

[Tim Cooke]

You need to define the application's entry point. There's a couple of ways to do it, both described here:
The Java Tutorials: Setting an Application's Entry Point

[Stephanie Challand]

Thanks. I thought I had done that in my manifest file

Manifest-version: 1.0
Main-Class: src.main.java.appname
Class-Path: . lib/javafx-dialogs-0.0.1.jar lib/junit-4.7.jar lib/opencsv-2.3.jar lib/xmlpull-1.1.3.1.jar lib/xpp3_min-1.1.4c.jar lib/xstream-1.4.3.jar jarname.jar

[Dave Tolls]

What class is it not finding?

[Jesper de Jong]

Stephanie Challand wrote:Main-Class: src.main.java.appname

Is your class really in a package named "src.main.java"? In other words, for this to work you have to have this package statement in the source file appname.java:

package src.main.java;

You have probably the wrong package or directory structure in your JAR file.

[Stephanie Challand]

Thanks! Yep the package statement is there. Like I mentioned this works on my computer and many others. I have only found one person who cannot double click the .jar and have it run, but double clicking the .cmd I showed above works for her. Just trying to get consistency so that everyone can run it by double-clicking the .jar.

[Campbell Ritchie]

So everybody else can get that .jar to run, except one person?

[Stephanie Challand]

Yes, one so far. I suppose there may be more out there, but only one that I know of.

[Mary Shell]

Since it runs from the command line where you type out the path for the java.exe. Check the path variable on the persons pc. It needs to have the java directory ('c:\Program Files\Java\jdk1.6.0\bin\')in it.

Then the command line will work with:

java -jar app.jar

You might also check the file type association for .jar extensions

Also, if they are clicking on an icon to run the jar, check the 'Start in' property in the shortcut.

[Stephanie Challand]

Thanks I actually did a remote session with them and verified that their java classpath was the same as mine.

Isn't there a way to include that so that if the classpath is not set or set correctly the double-clicking of the .jar will run it properly?

I didn't specifically check the association of the file, but the .jar icon had the java look.

[Mary Shell]

Check the 'Start in' property on the shortcut, it should reflect the location of the jar.

Nothing happens when the field is empty.

Does it execute when you double click on it from the directory?

[Stephanie Challand]

It tries to open but I get the java.lang.noclassdeffound on that person's computer only

[Campbell Ritchie]

By no class def found do you mean an Exception? Has that .jar file become corrupted?

[Dave Tolls]

What class?
ClassDefNotFound will tell you what class it can't find...

[Stephanie Challand]

The main class I believe, since it wont even run. I just get the cmd window with that error. I just got a screenshot from the person and that was cut off a bit though.

It is just strange that everyone else can run it with the .jar and this person can run it with the .cmd file that runs the .jar.

So is there a better way to compile and distribute a java app? Java is not my typical programming language. I took a few classes in college, but for this project Java was needed so it could be run on macs and pcs. It is just a small app but we want to have consistency in how to distribute it to users and in how they run it.

Thank you all for all your suggestions!!

[Dave Tolls]

Stephanie Challand wrote:The main class I believe, since it wont even run. I just get the cmd window with that error. I just got a screenshot from the person and that was cut off a bit though.

I'd want to know exactly which one.
It could be that it's incorrectly deployed and one of the jar files isn't accessible...so various classes can't be reached.

[Stephanie Challand]

I would agree, but as I said over 30 others can run the EXACT same file perfectly fine, so I don't think that is it....

[Dave Tolls]

Stephanie Challand wrote:I would agree, but as I said over 30 others can run the EXACT same file perfectly fine, so I don't think that is it....

Without knowing the exact error, though, you are playing on guesswork.

I have lots of instances where something is identical, but not working, only for it to turn out that that isn't actually the case.

[Stephanie Challand]

Thanks. I understand that. Okay, then does anyone have any other ideas on how to create an executable type program that will work on both pcs and macs vs just a .jar file?

This is a project for a non-profit so free is best

[Campbell Ritchie]

As you have been told, we ought to see the complete error message before we can help. As long as you have not put implementation‑specific code in the .jar, it should run exactly the same on Windows® Mac and Linux. I presume you have seen the instructions in the Java® Tutorials.

[Stephanie Challand]

Thanks I am attaching the error screenprint from the person. When they try to run the .jar this just flashes quickly so you cannot see the entire error message. When they run the SAME .jar from the command line using the code below it runs without the error so I am not sure how you would get the full error any better.

"c:\Program Files\Java\jdk1.6.0\bin\java" -jar "C:\Users\river\Desktop\App\Working\SR.jar"

We have it running completely fine on over 30 computer, which include both macs and pcs. This one in question is a Windows 10 pc, but we have at least 2 others on Windows 10 which double-clicking the .jar runs fine.

I guess I just want to know what is the proper way to ensure that there is a way to easily run things on EVERY computer that we distribute this to as these are not computer savvy people.

Error Message:

https://www.dropbox.com/s/p51x2ekto52bjvv/2016-01-14_11-13-09.png?dl=0

[Ron McLeod]

Next time, please copy and paste the text here rather than providing a link to a screen capture.

This is the error message text:
    Exception in thread "main" java.lang.NoClassDefFoundError: C:\Users\river\Desktop\SR App\ScoreRoomApp v2/0\ScoreRoom/jar

[Stephanie Challand]

I would have but it is not on my computer. This is what I got from that person....so sorry. You requested the error message so that is all I have to provide.

[Naveed Momin]

Still the class name is not shown in the error message.

[Stephanie Challand]

Like I have said that is all I have. I guess I am on my own then...Thanks anyway.