I have a problem when I use grail automatic databinding \"ex: Test t = new Test(params)\" with decimal delimiter on Double form field. After few search, I\'ve found that it
For Grails 2.3+ you can properly override the default binder/converter, although it is not trivial or intuitive.
See my answer here: Binding real number values to Grails domain attributes (values sent by Dojo widgets)