The old Oracle Forms and Reports between 9 and 10 is not working with JRE 7

Shortly:

Just put a system variable on your operating system


name:
JAVA_TOOL_OPTIONS  

value:
-Djava.vendor="Sun Microsystems Inc."


You can use the same value in Java options under the hood of the java engine, in control panel.

BE AWARE! Dont't forget the leading "-" , before of the "Djava...."!

Good luck!