Problem editing Groups

ever since we upgraded from 3.8.2 to 3.9.1 we get the following error. 

Problem accessing /group-edit.jsp. Reason:

    org.jivesoftware.openfire.group.Group.getProperties()Ljava/util/Map;

We are not using the bundled java engine. We are using /usr/java/latest. which is

java version "1.7.0_45"

Java(TM) SE Runtime Environment (build 1.7.0_45-b18)

Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)