Grails的呼叫服務錯誤

Question

我有我在正確的文件夾（我有一個電子郵件插件，它在一個控制器工作良好，IV測試它）

class SendMailService { 

    static transactional = false 

    def serviceMethod() { 

       sendMail {  
        to "xxx" 
        from "xxx" 
        subject "Hello Fred"  
        body 'How are you?' 
       } 

    } 
} 

服務，我稱它是石英插件內工作：

class SendAlertJob { 
    def timeout = 5000l // execute job once in 5 seconds 

    def execute() { 

     def SendMailService 

     SendMailService.serviceMethod() 

    } 
} 

，並收到此錯誤：

2011-12-12 20:37:59,781 [quartzScheduler_Worker-3] ERROR listeners.ExceptionPrinterJobListener - Exception occured in job: GRAILS_JOBS.tv_megazineplus.SendAlertJob 
org.quartz.JobExecutionException: Cannot invoke method serviceMethod() on null object [See nested exception: java.lang.NullPointerException: Cannot invoke method serviceMethod() on null object] 
    at org.codehaus.groovy.grails.plugins.quartz.GrailsJobFactory$GrailsTaskClassJob.execute(GrailsJobFactory.java:81) 
    at org.quartz.core.JobRunShell.run(JobRunShell.java:199) 
    at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:546) 
Caused by: java.lang.NullPointerException: Cannot invoke method serviceMethod() on null object 
    at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77) 
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:45) 
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40) 
    at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:32) 
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40) 
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:54) 
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120) 
    at tv_megazineplus.SendAlertJob.execute(SendAlertJob.groovy:11) 
    at sun.reflect.GeneratedMethodAccessor287.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:186) 
    at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:171) 
    at org.codehaus.groovy.grails.plugins.quartz.GrailsJobFactory$GrailsTaskClassJob.execute(GrailsJobFactory.java:77) 
    ... 2 more 

Answer 1

的SendMailService應在類級別聲明它是一個utowired /注射。

class SendAlertJob { 
    def timeout = 5000l // execute job once in 5 seconds 

    def SendMailService 

    def execute() { 
     SendMailService.serviceMethod() 

    } 
}