spring security problem using grails - facebook

Question

I am new to grails and spring security plugin core , but i am facing a problem of
ERROR GrailsExceptionResolver - a different object with the same identifier value was already associated with the session: [nayax.SecUserSecRole#nayax.SecUserSecRole : null]
my code is :
NayaxUser populateDataFromJson(def user) {
//todo: HANDLE CASES OF CREATING ROLES FOR USER AND REAUTHENTICATE THEM
println "#### In FUNCTION ####"
Facebook existingProfile = Facebook.findByFid(user.id)
if (existingProfile) {
println "### User already present in the database ####"
existingProfile.setUser(existingProfile.user)
//todo: CREATE ROLE AND REAUTHENTICATE USER
SecRole secRole1 = SecRole.findByAuthority(SecRoleConstants.ROLE_USER)
SecUserSecRole.create(existingProfile.user, secRole1)
//todo: REAUTHENTICATE USER
springSecurityService.reauthenticate(existingProfile.user.username)
existingProfile.user.merge()
return existingProfile.user
}
else {
Facebook facebookObj = new Facebook(fid: user.id, lastLogin: new Date(), creationDate: new Date()).save(flush: true)
NayaxUser nayaxUser = new NayaxUser(facebookUrl: user.link, fullName: user.name, facebook: facebookObj, username: user.email, password: springSecurityService.encodePassword("pleaseChangeMe"), enabled: true)
if (nayaxUser.save(flush: true)) {
println "### WORK DONE , saved user and save the user in session ###"
facebookObj.setUser(nayaxUser)
//todo: CREATE ROLE AND REAUTHENTICATE USER
SecRole secRole = SecRole.findByAuthority(SecRoleConstants.ROLE_USER)
SecUserSecRole.create(nayaxUser, secRole)
//todo: REAUTHENTICATE USER
springSecurityService.reauthenticate(nayaxUser.username)
nayaxUser.merge()
return nayaxUser
}
else {
println "### ERROR IN VALIDATING DATA So NOT SETTING THE USER IN SESSION ####"
nayaxUser.errors.allErrors.each { error ->
println("### ERROR IS ${error} ####")
}
return nayaxUser
}
}
}
Actually , when i am loggin in from the facebook button and then logging out from my implementation and then logging back again quicky then there is an exception but after logging out i refresh the page a few times the problem disappears. I think something is wrong with my facebook logout implementation or is there something in the code ???
Any suggestions are welcome..

Answer 1

Try to use facebook javascript api for logout before call your logout controller to clear session and etc e.g:
if facebook user exists
logout facebook user with fb js api
js redirect to logout controller
else
redirect user to logout controller
This logic should be applied in the frontend of your application assuming that if there isn't facebook user, user will be redirected directly to the logout controller.
I have problems with facebook logout with java and php api from the fb application but in that way I overcome those problems.