Can't launch .jar file

i think your problem about advanced setting on Java Control Panel.

try this : open system preferences > java (and java control panel will open in another window) > click Advanced Tab and look your setting on it. Try to make your setting same with me.

Debugging - uncheck all

Java console - check Hide Console

Shorcut creation - check Prompt user if hinted

JNLP File/MIME Association - check Prompt user

Application installation - check Install if hinted

Secure execution environment - check all except the last

Mixed code (sandboxed vs trusted) security verification - check Enable - show warning if needed

Perform certificate revocation checks on - check All certificates in the chain of trust

Check forcertificate revocation using - check Both CRLs and OCSP

Advanced scurity settings - check number 1,2,3,5,6

Miscellaneous - uncheck

In theory and Apple seem to imply this, one should only need to install the latest Java which is as you listed Version 7 release 55. However my experience is that one still needs to first install Apple's old version 6 and then immediately after install version 7. Version 6 can be downloaded from the following page

http://support.apple.com/kb/dl1572

I think as you have already installed version 7 all you need to do is install the above and all should be ok. I would run the above installer and then go to the Java test page on the Oracle website.

http://www.java.com/verify/

If it reports the wrong version (it should report version 7) or does not work reinstall version 7 after version 6.