Thank you for your fast answer!
I have two more question about it:
1 With the B4J Packager it is easy to install alle necessary java components on the devices. Does the packager renew the existing java 7 components or does it install the java 8 components parallel?
2 Does the java 8 components, which are installed with the packager, ask the system for updates, when there are available? Because it is a closed system, it is better not to stir java-updates.
Thank you for your efforts...