Help me! I can't run a .jar file!

[The Ripper18]

I play a game called Runescape, and I wanted to try playing on a private server. I found a good program for running private servers called MoparScape. Unfortunately, in the readme it says mac users should run the file "MoparScape.jar", but when I run it I get the following alert: "The jar file "MoparScape.jar" couldn't be launched. Check the Console for possible error messages." Can anybody help me?

Edit: I run OS 10.3.9

 

[Natobasso]

Looks like you need Xcode to create a .jar app...maybe you need it to open one as well?
http://www.centerkey.com/mac/java/

 

[ElDiabloConCaca]

Did you check the console for error messages, like the error message recommended? What were the error messages?

 

[mrmagoo123]

I have the exact same problem. Here's what it says when you open the console:

Jar Launcher[805]: Could not contact MightyMouseHelper.app: Err 6

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bot (Unsupported major.minor version 49.0)

at java.lang.ClassLoader.defineClass0(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:539)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)

at java.net.URLClassLoader.access$100(URLClassLoader.java:55)

at java.net.URLClassLoader$1.run(URLClassLoader.java:194)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:187)

at java.lang.ClassLoader.loadClass(ClassLoader.java:289)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)

at java.lang.ClassLoader.loadClass(ClassLoader.java:235)

at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)


I hope that makes sense to someone.

 

[VirtualTracy]

Can I ask where this .jar file was sourced from? You may need to ask the original .jar file creator about this error .... which website did you download it from?




.

 

[mrmagoo123]

I don't know about him, but I downloaded it from http://www.megaupload.com/de/?d=MW6EBEQ5

 

[hasmiza73]

i got the .jar file when i tried to install the camera setup in for my facebook chat.

when i tried to install it, it gave me the error message like this:

**************************************************
"Check the Console for possible error messages."

How can i rectify this?