Grails - 无法从控制器调用服务 - >总是得到“不能在空对象错误上调用方法” [英] Grails - Can't call service from Controller --> always get "Cannot invoke method on null object error"

问题描述

我有一个grails应用程序，我在这里遵循教程：

http：/ /www.grails.org/Services

i have a grails application and i'm following the tutorial here:
http://www.grails.org/Services

我有一些代码

import org.springframework.beans.factory.InitializingBean

class SubmitRequestService implements InitializingBean{
    def GrailsApplication1
    def setting

    void afterPropertiesSet(){
        this.setting = GrailsApplication1.config.setting
    }

    def void sendHistoricalContract(HistoricalContract hc_instance){
        //... blah blah whatever code      
    }
}

class SubmitRequestController {    
    def submitRequestService
    static allowedMethods = [save: "POST", update: "POST", delete: "POST"]

    def index = {
        // .... blah blah whatever code
        submitRequestService.sendHistoricalContract(historicalContractInstance)
    }    
}

无论我做什么，我似乎无法获得服务注入到控制器。每当我到达我调用服务的行，我得到的错误：

No whatever i do, i can't seem to get the service to be injected into the controller. Whenever I get to the line where i call the service i get the error:

ERROR errors.GrailsExceptionResolver - 无法调用sendHistoricalContract null对象

ERROR errors.GrailsExceptionResolver - Cannot invoke method sendHistoricalContract() on null object

我做错了什么？

/ p>

Thanks in advance

推荐答案

Burt的答案是有帮助的（+1到Burt），但是如果其他人遵循这里的教程：

http://www.grails.org/Services

并体验相同的问题我有，我想让它明确：

Burt's answer is helpful (+1 to Burt) but in case others are following the tutorial here:
http://www.grails.org/Services
and experiencing the same issue i had, i want to make it explicit:

服务进入自己的文件在
的服务目录，你做不是
结合他们与控制器，甚至
虽然它看起来像在代码
示例

Services go in their own files under the Services directory, you do not combine them with controllers, even though it looks that way in the code examples

请参阅上面关于服务和Spring框架的其他资源的Burt的评论。

See Burt's comment above on additional resources to Services and the Spring Framework.

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