StackOverflowError serializing transient instances

[sergiomichels]

With a simple domain class:

class Contact {
  String name
  String phone
  static constraints = {
     name blank:false, maxSize: 255
     email blank:false, maxSize: 255, unique: true
  }
}

And a controller save method:

def save() {
  Contact contact = new Contact(name: params.name, phone: params.phone, email: params.email)
  if(contact.save(flush:true)) {
    def pars = [success: false, contatos: contact]
    render pars as GSON
  } else {
    println contact.errors
    def pars = [success: false, contatos: contact] 
    render pars as GSON
  }
}

I'm getting StackOverflowError if I try to serialize a non-saved instance. This can be simulated in an Integration Test:

void testNewElement() {
  contactController.params.name = "teste"
  contactController.save()
}

[sergiomichels]

@robfletcher This issue seems related to the another that I created. I tested here and changing:

applicationContext?.getBean('gsonBuilder', GsonBuilder) ?: new GsonBuilder()

to

Holders.grailsApplication.mainContext.getBean('gsonBuilder', GsonBuilder)

solves the issue. The downside is that mainContext needs to be manually defined in unit tests (in Grails 2.3.x it was solved):

void setup() {
  grailsApplication.mainContext = applicationContext
  Holders.setGrailsApplication(grailsApplication)
}

Question: I think this test suits better in test/apps. How can I use it? Did you approve this change or am I missing something?

[sergiomichels]

This will probably solve #40 too