We are aware thatthere has been a chnage in treemap in JDK7 and it does not accept Invalid elements throwing a Nullpointer.
Tests should be accomodated to handle this

http://hudson.qa.jboss.com/hudson/view/EAP5/view/JDK7/job/eap5-hibernate-dballocator-jdk7-core/database=oracle11gR1,jdbc=jdbc4,jdk=java17_default,label=RHEL6_x86_64/lastCompletedBuild/testReport/

Tests failing :

All testcases in org.hibernate.test.legacy.FooBarTest