OPENAM-2118 fix to generate xacml3 code using JDK 6, as JDK 7 generation causes incompatibility with older versions of the JDK.

git-svn-id: https://svn.forgerock.org/openam/trunk/openam@4066 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d