hi friend i had the same problem with java error i make this step first i install virtual box with win 7 32 bits fresh image
when i open win 7 32 bits first i install the globaltis 25 when installation are finish go to the files where you put you globaltis and try to find the root file
you will find a java setup "jre-6u12-windows-i586-p" install it and don t make update reboot and then active globaltis .
Very important you need to install this java file for the first time if you installed before a new version of java ex version 8 and you uninstall it and then you install the java setup present into opel globaltis v25 file then will have the same problem ;) hope it will help
I FIND THIS ON INTERNET THE MANUAL OF OPEL GLOBALTIS IT TALK ABOUT JAVA PROBLEM TOO.
don 't forget thanx if i help ;)