在 groovy 类中使​​用 grails 邮件插件发送邮件 - 空配置错误

Question

我收到错误“由 NullPointerException 引起：null ->> 64 | grails.plugin.mail.MailService 中的 getMailConfig”。我已经按照邮件插件提供的文档配置了 config.groovy。

请帮我解决这个问题。

在下面找到我的 config.groovy 代码。

grails
{

    mail {
        host = "smtp.gmail.com"
        port = 465
        username = "xxxxxx@gmail.com"
        password = "xxxxxx"
        props = ["mail.smtp.auth":"true",
                 "mail.smtp.socketFactory.port":"465",
                 "mail.smtp.socketFactory.class":"javax.net.ssl.SSLSocketFactory",
                 "mail.smtp.socketFactory.fallback":"false"]
      }
}

在下面找到我的 groovy 类代码。

package common

import grails.plugin.mail.*;

public class FlowSchedule implements Job {

    def mailService = new MailService()

    public void execute(JobExecutionContext context)
           throws JobExecutionException {

                    //some extra logic here
                   sendEmail(schedulerEntry.name,schedulerEntry.email)

    }
    def sendEmail(String name,String email)
    {

            mailService.sendMail {
                to "amith.ravuru@citrix.com"
                subject "Hello Amith"
                body 'this is some text'
            }
    }
}

完整的错误跟踪：

Error |
2014-07-14 12:41:00,041 [DefaultQuartzScheduler_Worker-4] ERROR core.ErrorLogger  - Job     (group.Job_1 threw an exception.

Message: Job threw an unhandled exception.
   Line | Method
->> 213 | run in org.quartz.core.JobRunShell

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

**^   573 | run in org.quartz.simpl.SimpleThreadPool$WorkerThread
Caused by NullPointerException: null**

**->>  64 | getMailConfig in grails.plugin.mail.MailService**

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    59 | sendMail in     ''
|    94 | sendEmail in common.FlowSchedule$$EOk1HyVA
|    79 | execute in     ''
|   202 | run in org.quartz.core.JobRunShell
^   573 | run in org.quartz.simpl.SimpleThreadPool$WorkerThread

Answer 1

我通过将 sendEmail 部分移动到控制器解决了这个问题。然后，从 src/groovy 中的任何类调用控制器方法。因为，在控制器中，grailsApplication 可以使用 def grailsApplication 注入。请在下面找到控制器代码。

   class SendMailController 
   {

   def grailsApplication

   def sendEmail(String name,String email,String mailsubject)
   {

       if(email != null)
       {


           try
           {

               sendMail {
                   to email 
                   from "exabgpnotifier@gmail.com"
                   subject "ExaBGP Notification"
                   body "Hello "+name+"\n\n"+ mailsubject +" \n\nRegards,\nExaBGP Team"
                }
           }
           catch(Exception e)
           {
               e.printStackTrace()
               println "ERROR!!: Unable to send the notification to email "+ finalemaillist.toString()
           }
       }
   }
   }

Answer 2

我猜这个插件将 mailService 注入到您的应用程序中。因此，不要像您所做的那样使用构造函数创建服务：

def mailService = new MailService()

只要声明字段，让DI机制来做值注入工作：

def mailService

代码的其余部分看起来还不错。考虑更改 sendMail 方法的名称，现在当您的方法名称与来自 mailService 的方法名称相同时，这有点令人困惑。

希望对您有所帮助！

Answer 3

我认为这行不通：

grails
{

    mail {
        host = "smtp.gmail.com"
        port = 465
        username = "xxxxxx@gmail.com"
        password = "xxxxxx"
        props = ["mail.smtp.auth":"true",
                 "mail.smtp.socketFactory.port":"465",
                 "mail.smtp.socketFactory.class":"javax.net.ssl.SSLSocketFactory",
                 "mail.smtp.socketFactory.fallback":"false"]
      }
}

这是有效的代码，但不符合您的预期。 grails 之后的左大括号需要在同一行，因此闭包被视为 grails 方法的参数。

grails {

    mail {
        host = "smtp.gmail.com"
        port = 465
        username = "xxxxxx@gmail.com"
        password = "xxxxxx"
        props = ["mail.smtp.auth":"true",
                 "mail.smtp.socketFactory.port":"465",
                 "mail.smtp.socketFactory.class":"javax.net.ssl.SSLSocketFactory",
                 "mail.smtp.socketFactory.fallback":"false"]
      }
}

Answer 4

打开你的 resources.groovy 文件并输入这个条目。

import common.FlowSchedule
beans = {
   // make sure you import flow schedule class
   flowSchedule(FlowSchedule) {
      mailService = ref('mailService')        
  }
}

然后在你的课堂上。

package common

import grails.plugin.mail.*;

public class FlowSchedule implements Job {

  def mailService

  public void execute(JobExecutionContext context)
       throws JobExecutionException {

                //some extra logic here
               sendEmail(schedulerEntry.name,schedulerEntry.email)

  }
  def sendEmail(String name,String email)
  {

        mailService.sendMail {
            to "amith.ravuru@citrix.com"
            subject "Hello Amith"
            body 'this is some text'
        }
  }
}

当您需要任何控制器或服务中的流调度时，只需执行此操作

class MyService {

   def flowSchedule

   def myMethod() {
      flowSchedule.sendEmail('test','test@test.com')
   } 
}