Groovy formatter ignoring @formatter:off directive

I have lists that are being broken onto separate lines that I wish to keep on the same line.

I tried to simply turn off formatting for this section of code, to no avail.

It appears that the groovy formatter does not respond to this directive: @formatter:off that is part of the base eclipse formatter

grails.plugins.springsecurity.interceptUrlMap = [
'/js/**': ['IS_AUTHENTICATED_ANONYMOUSLY'],
'/css/**': ['IS_AUTHENTICATED_ANONYMOUSLY'],
'/images/**': ['IS_AUTHENTICATED_ANONYMOUSLY']]

is being turned into

grails.plugins.springsecurity.interceptUrlMap = [
'/js/**': [
'IS_AUTHENTICATED_ANONYMOUSLY'
],
'/css/**': [
'IS_AUTHENTICATED_ANONYMOUSLY'
],
'/images/**': [
'IS_AUTHENTICATED_ANONYMOUSLY'
]