Groovy plugin causes warning during build

[INFO] --- gmaven-plugin:1.5:execute (read-notice) @ uimafit-parent ---
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by
org.codehaus.groovy.reflection.CachedClass$3$1
(file:/C:/Users/MarshallSchor/.m2/repository/org/codehaus/groovy/groovy-all/1.6.9/groovy-all-1.6.9.jar)
to method java.lang.Object.finalize()
WARNING: Please consider reporting this to the maintainers of
org.codehaus.groovy.reflection.CachedClass$3$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal
reflective access operations

WARNING: All illegal access operations will be denied in a future release