Keep getting errors when trying to open JAR files

Hi
My son is trying to open a .jar on his Macbook to add a mod to Minecraft. It throws an error and directs him to Console each time, but Console isn't showing any errors. Using advice on a couple of similar threads I followed some steps but ended up at a dead end.
The Terminal message I get when I follow the steps in another thread is this:
Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/swt/widgets/Display
Caused by: java.lang.ClassNotFoundException: org.eclipse.swt.widgets.Display
          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)
Any help on what I need to do to resolve this so he can open it will be much appreciated.
Thanks
Andy

Hi Eric.
I am referring to the main Console. I don't see anything in Java Console - but the steps I followd in teh other thread yielded that error message from Terminal - it was different from the error in the other thread, which related to out of data Java install. I have no clue what this is and Google isn't helping me much.
Any light that can be thrown on on this woudl be great
Thanks

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Keep getting errors when trying to open JAR files

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