Compilation error in ForgePropertyStyle (Generics)

When I compile ForgePropertyStyle.java using native mvn and jdk1.6.0_18 I get the following error on line 589:

type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,java.lang.annotation.Annotation

Here is some info I found about it: http://stackoverflow.com/questions/5666027/why-does-the-compiler-state-no-unique-maximal-instance-exists

It never happened in eclipse.