Java program does not work through a ssh connection

I'm trying to run a java program through an ssh connection, but I receives an error concerning the X11 Display.

Here all the steps & errors:

- My local

> ssh user@ip_mac

Connection succeed

- Then in my MAC OS (Maverick)

> java -jar zzzzz.jar

"No X11 DISPLAY variable was set, but this program performed an operation which requires it"

So, I check it and the variable DISPLAY seems to be set:

> echo $DISPLAY

/tmp/launch-BVoaQK/org.macosforge.xquartz:0

If I open a terminal locally and do the same procedure, the java program runs well.

Any clue?

I tried also to run other applications (like Safari, Calculator, etc) and in these cases they run perfectly... It seems that it is just a java issue....