The BootStrap.groovy file is used to simulate example data in a Grails application. When the application starts, it will automatically execute the BootStrap class to create sample User and Role domain objects and associate them for testing purposes. It also configures email settings to send notifications when the application starts or shuts down.

1. BootStrap.groovy

2. BootStrap.groovy
Grails allows to simulate example data (this is called bootstrapping).
To create example data, you can use the class BootStrap.groovy from the
directory ./grails-app/conf with some data
This class is automatically executed whenever the server is started and can be
used to create some example data for testing.

3. class User {
String username
String name
static hasMany = [roles: Role]
static constraints = {
username(nullable: false, blank: false, unique: true)
name(nullable: false, blank: false, unique: true)
}
}
class Role {
String name
static constraints = {
name(nullable: false, blank: false, unique: true)
}
}
Domain

4. BootStrap.groovy
class BootStrap {
def init = { servletContext ->
User user1 = new User(username: 'user1', name: 'Regular')
User user2 = new User(username: 'user2', name: 'Super')
User user3 = new User(username: 'user3', name: 'Über')
User user4 = new User(username: 'user4', name: 'Admin')
Role role1 = new Role(name: 'Observer')
Role role2 = new Role(name: 'Executor')
Role role3 = new Role(name: 'Collector')
Role role4 = new Role(name: 'Administrator')
user1.addToRoles(role1)
user2.addToRoles(role1)
user2.addToRoles(role2)
user3.addToRoles(role1)
user3.addToRoles(role2)
user3.addToRoles(role3)
user4.addToRoles(role4)
role1.save() role2.save() role3.save() role4.save() role1.save() user2.save() user3.save()
user4.save()
}
}

5. grails {
mail {
host = "smtpserver"
port = 123
username = 'username'
password = 'password'
props = ["mail.smtp.auth":"true",
"mail.smtp.socketFactory.port":"465",
"mail.smtp.socketFactory.class":"javax.net.ssl.SSLSocketFactory",
"mail.smtp.socketFactory.fallback":"false"]
}
}
grails.mail.default.from = "abc@xyz.com"
grails.mail.disabled=true
app.startup.mail.to = "abc@xyz.com"
Config.groovy

6. def init = { servletContext ->
println "Application starting up... "
def toMail = ConfigurationHolder.config.app.startup.mail.to
def mailSubject = "Application starting up on
${InetAddress.localHost.hostName}";
String mailBody = '''
Application started at ''' + new SimpleDateFormat("dd-MMM-yyy hh:mm:ss").format(new
Date()) + '''<br/>''' +
'''<a href=' ''' + ConfigurationHolder.config.grails.serverURL + ''' '> ''' +
ConfigurationHolder.config.grails.serverURL + '''</a><br/><br/><br/>
@Note : This is an automatically generated email.
'''
sendNotification(toMail, mailSubject, mailBody )
}

7. def destroy = {
println "Application shutting down... "
def toMail = ConfigurationHolder.config.app.startup.mail.to
def mailSubject = "Application starting up on
${InetAddress.localHost.hostName}";
String mailBody = '''
Application shutting down at ''' + new SimpleDateFormat("dd-MMM-yyy
hh:mm:ss").format(new Date()) + '''<br/>''' +
'''<a href=' ''' + ConfigurationHolder.config.grails.serverURL + ''' '> ''' +
ConfigurationHolder.config.grails.serverURL + '''</a><br/><br/><br/>
@Note : This is an automatically generated email.
'''
sendNotification(toMail, mailSubject, mailBody )
}

8. def sendNotification(String toMail, String mailSubject, String mailBody)
{
println "### sending email ###"
mailService.sendMail {
to toMail
subject mailSubject
body mailBody
}
}