Java program works on Windows but not Mac

Question

I made a small program for a friend and when I run it on my Windows machine it works fine. However when I run it on his I get

Exception in thread "main" java.lang.NoClassDefFoundError: SupplierControl/jar
Caused by: java.lang.ClassNotFoundException: SupplierControl.jar
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

Not sure why it would work on one not the other

Thanks

Can you show us how you are running in Mac vs Windows? The error suggests that java thinks the jar file is the name of the class you want to run, rather than a container of class files as you would specify with -jar or on the classpath. — tuckermi
– tuckermi, Commented Jul 23, 2013 at 14:44
Is this program a jar file? Do you start it from console or via file explorer? — Marian Bäuerle
– Marian Bäuerle, Commented Jul 23, 2013 at 14:45
I have the dist folder in dropbox and then just double click it in windows and then from the mac tried double click but as it did not work i did the terminal and from that got the error — bubblebath
– bubblebath, Commented Jul 23, 2013 at 14:45

Jesper · Accepted Answer · 2013-07-23 14:46:14Z

3

I bet you're trying to run it with a command that looks like this:

java SupplierControl.jar

Note that what you pass to the java command must be a fully-qualified class name. What happens is that Java is going to look for a class named jar in the package SupplierControl. That's not what you meant.

If it's an executable JAR, then run it with:

java -jar SupplierControl.jar

answered Jul 23, 2013 at 14:46

Jesper

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Stephen C · Accepted Answer · 2013-07-23 14:46:26Z

1

The problem is in the way that the command is being run. Assuming that it is an "executable" JAR file, you should be running it as:

$ java -jar SupplierControl.jar

but you appear to have left out the -jar argument.

If you leave out the -jar, the java command will interpret SupplierControl.jar as a qualified classname; i.e. a class called "jar" in the package "SupplierControl". Of course, it cannot find the corresponding ".class" file ... and you get a NoClassDefFoundError as a result.

answered Jul 23, 2013 at 14:46

Stephen C

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Holger · Accepted Answer · 2013-07-23 14:48:32Z

0

You should run it with the command

$ java -jar SupplierControl.jar

Then you are executing the jar and all should be well.

answered Jul 23, 2013 at 14:48

Holger

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