Per Oracle Java SE Support Roadmap, dated December 19th, 2014 (http://www.oracle.com/technetwork/java/eol-135779.html):
Support for Java 7 has the following changes:
March 2014 – End of public update notifications
April 2015 – End of public updates
Users of Java 7 can continue to receive updates to Java 7 through Oracle Java SE Support.
In compliance with Oracle’s direction, DXOP V5.0_b070 and DXOP V6.0_b001 will require Java 8 to ensure compatibility and compliance with industry direction.
DXOP V4.1 will not be maintained to work with Java 8.
For any queries please email DXOP-Support@dataexpress.com