The Java File ... Could Not Be Launched

I have X.jar files that whenever I launch java opens (as I can see in the dock) and then immidately quits.
A few seconds later I get a popup:
"The Java JAR file "Whatever.jar" could not be launched. Check the console for possible error messages."
Typing "java -version" into terminal gives me this:
java version "1.7.0_09"
Java(TM) SE Runtime Environment (build 1.7.0_09-b05)
Java HotSpot(TM) 64-Bit Server VM (build 23.5-b02, mixed mode)
I've downloaded the latest Java from Apple: http://support.apple.com/kb/dl1572
I've also selected "Show Java Console" in the Java Preferences. No console appears when I launch a .jar file.
I also cannot locate a "Java Console.log" file anywhere that might be able to lead me to the actual error.
Any ideas?

After following baltwo's instructions, make sure you repair permissions and restart your comp after the installation. 

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