Grails mail plugin runtime configuration - email

Question

Using grails mail plugin 1.0.7.
https://jira.grails.org/browse/GPMAIL-36 states that it's possible to change plguin configuration since 1.0.1 at runtime. Sadly it does not explains how to achieve it.
I want to be able to change the username at runtime to be able to use different mail accounts.
Thanks.

Answer 1

Based on this code, you should be able to change the configuration at runtime and the mail plugin will automagically re-deploy and update mail sender based on your changes.
Example:
Holders.config.grails.mail.username = 'foo'
Holders.config.grails.mail.password = 'bar'
sendMail {
to "foo#bar.com"
from "bar#foo.com"
subject "Hi"
body "This is an email"
}
Update:
It would appear that changing the configuration in this manner does not, in fact, fire the onConfigChange event. Per this, you can fire the event manually. Something like this:
Holders.pluginManager.getGrailsPlugin('mail').notifyOfEvent(GrailsPlugin.EVENT_ON_CONFIG_CHANGE, Holders.config)

Answer 2

I've realized this can be done accessing the mailSender bean from the context and updating it like is explained here
Changing mail configuration in runtime
However if #rmlan solution finally works it may be a much cleaner solution.

Answer 3

Actually thr rmlan solution works with the following fix. Since the onConfigChange compares hashCode of existing config map and new one, so if you set new configs in original configuration (Holders.config.grails.mail), then both configs are same and it never pass the condition to apply new changes, so a new structure should be created and pass it to notifyOfEvent method to mark the change as different hashCodes.
def mailConfig = [ grails: [ mail: [:] ] ]
mailConfig.grails.mail.host = newHost
mailConfig.grails.mail.port = newPort
Holders.pluginManager.getGrailsPlugin('mail').
notifyOfEvent(GrailsPlugin.EVENT_ON_CONFIG_CHANGE, mailConfig)
Still using async-mail and this one make the below exception
No qualifying bean of type [grails.plugin.mail.MailService] is defined: expected single matching bean but found 2: nonAsynchronousMailService,mailService
that is thrown because of the following part of onConfigChange
event.ctx.getBean(MailService.class).setPoolSize(mailConfig.poolSize?:null)
Commenting it let it works as a workaround, but making sendMail of mail plugin is called, not async-mail, so exception may raise if async-mail features is used on constructing mail. Hence to use async-mail in this workaround should use sendAsynchronousMail method.