Can't open .jar file, nothing happens when I click, MAC OS 10.6.8

Hello,
I can't open .jar file, nothing happens when I click on the .jar file.
I have MAC OS 10.6.8
The thing it, I have desktop application that I'm building on Netbeans and when I compile and deploy it... it runs from Netbeans folder where I have all the files but copying the .jar on the desktop. It says "The Java JAR file "blablabla.jar" could not be launched check the Console for possible error messages"
Any idea or solution will be appreciated.
Thanks in advance
Charles

These are Java files.  http://www.java.com/en/ is where you can get the latest Java for your operating system. If your Java files need an older version of Java, there are instructions on the web to downgrade Mac Java, but it is difficult, and poses security issues.

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