ESR Builder java applet doesn't start

Hi all,

while trying to start the ESR Builder i get the following error message:

I opened it with Javaws from JDK 1.7. When i try to open it with a 1.6 version, the application didn't even get displayed.

The weird thing is that opening the Integration builder isn't a problem at all..

Is this a java related issue or has this something to do with SAP?

Thanks for your help,

Maurice