g.formatDate 从作业执行时会引发错误？

Question

我使用 Grails 作业来启动使用 g.formatDate 的服务。直接从控制器使用服务时，我没有问题。当我使用作业中的服务时，出现以下错误：

ERROR listeners.ExceptionPrinterJobListener  - Exception occurred in job: Grails Job
Message: java.lang.NullPointerException
   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
Caused by NullPointerException: null
->> 245 | $tt__sendReportCompanyWeekly in Test.SendMailService$$EPPc274K
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    47 | doCall  in Test.ReportCompanyWeeklyJob$_execute_closure1
|    31 | execute in Test.ReportCompanyWeeklyJob$$EPPc2HTU
|   104 | execute in grails.plugins.quartz.GrailsJobFactory$GrailsJob
|   202 | run . . in org.quartz.core.JobRunShell
^   573 | run     in org.quartz.simpl.SimpleThreadPool$WorkerThread

这是我的工作：

class ReportCompanyWeeklyJob {  

  SendMailService sendMailService


  static triggers = {
    cron name: 'scheduledReportCompanyWeeklyJob', cronExpression: "0 15 22 ? * *" 
  }

  def execute() {
    sendMailService.sendReportCompanyWeekly(company.id, user.id)
  }

}

这是我的服务：

@Transactional
class SendMailService {

    def gspTagLibraryLookup  // being automatically injected by spring
    def g

  def sendReportCompanyWeekly(String companyId, String userId) {    
    g = gspTagLibraryLookup.lookupNamespaceDispatcher("g")

    Date today = new Date()
    Locale locale = // some locale

    // Line 245
    def test = g.formatDate(date: today, formatName: 'date.format.long.no.year', locale: locale)  

 }

}

编辑：我使用groovyPageRenderer.render(template: viewPathHTML, model: myModel) 在服务中呈现 GSP。

如何让 g.formatDate 从 Job 运行时工作？

Answer 1

grails.gsp.PageRenderer 可以呈现的内容受到限制，因为它与从控制器呈现 GSP 页面的上下文不同。

当使用 formatName 时，g.formatDate() 会尝试从 GrailsWebRequest 获取 Locale。 Locale 用于从MessageSource 检索“date.format.long.no.year”。问题是grails.gsp.PageRenderer 没有GrailsWebRequest。可以看g.formatDate()源代码here。

解决方法

您可以通过格式化服务中的日期并通过模型将其传递给 GSP 来解决此问题。像这样的：

import java.text.SimpleDateFormat

@Transactional
class SendMailService {

    ...
    def messageSource // Injected to look up 'date.format.long.no.year'

    def sendReportCompanyWeekly(String companyId, String userId) {    
        Date today = new Date()
        Locale locale = // some locale

        def formattedDate = new SimpleDateFormat(messageSource.getMessage('date.format.long.no.year', null, locale), locale)
            .format(today)

        /* 
          1. Add the formattedDate to the PageRenderer model, 
          2. Update the GSP code to use the value from the model instead of g.formatDate()
        */
    }

}

更好的主意 - 创建一个 formatDate 闭包

import java.text.SimpleDateFormat

@Transactional
class SendMailService {

    ...
    def messageSource // Injected to look up 'date.format.long.no.year'

    def sendReportCompanyWeekly(String companyId, String userId) {    
        Date today = new Date()
        Locale locale = // some locale

        def formatter= new SimpleDateFormat(messageSource.getMessage('date.format.long.no.year', null, locale), locale)

        def formatDate = { Date date -> formatter.format(date) }

        /* 
          1. Add the formatDate Closure to the PageRenderer model, 
          2. Update the GSP code to use the Closure from the model instead of g.formatDate()
        */
    }

}