我创建了一个服务NotifierService
以使用grails邮件插件发送电子邮件。
class NotifierService {
MailService mailService
def sendWarningEmail(String name, String email, Date blockingDate) {
try {
mailService.sendMail {
to email
from "[email protected]"
subject "Status message: Warning"
body (view:"/email/warningEmail", model:[
name:name,
blockingDate:blockingDate
])
}
} catch (Exception e) {
e.printStackTrace()
}
}
}
我创建了另一个服务
ApplicationUtilService
,在其中尝试使用NotifierService
。class ApplicationUtilService{
def notifierService
def notifyUser(){
notifierService.sendWarningEmail("User name", "[email protected]", new Date())
}
}
我正在尝试在grails工作
notifyUser()
中调用UpdateJob
class UpdateJob{
def applicationUtilService
static triggers = {
// Scehduling parameters
}
def execute(){
applicationUtilityService.notifyUser()
}
}
我收到以下错误
Error 2014-12-05 12:04:53,550 [quartzScheduler_Worker-1] ERROR listeners.ExceptionPrinterJobListener - Exception occurred in job: Grails Job
Message: java.lang.NullPointerException: Cannot invoke method notifyUser() on null object
Line | Method
->> 111 | execute in grails.plugins.quartz.GrailsJobFactory$GrailsJob
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 202 | run in org.quartz.core.JobRunShell
^ 573 | run . . in org.quartz.simpl.SimpleThreadPool$WorkerThread ...`
当我实例化为
ApplicationUtilService applicationUtilService = new ApplicationUtilService()
而不是使用grails依赖注入(inject)。再次,
notifierService
中的ApplicationUtilService
存在相同的问题,并通过实例化与上面相同的方法进行了修复。现在,真正的问题是
mailService
。上面的实例无效。我该如何解决 最佳答案
Null指针发生在UpdateJob.applicationUtilService上,因此似乎applicationUtilService没有正确地注入(inject)UpdateJob中。 UpdateJob是否在正确的软件包中?