服务中的 Grails 消息源错误

Question

我在 Grails 3.3.11 中遇到了一点问题，我需要帮助。

我正在 grails 3.3.11 中开发 rest-api，但我无法在服务中使用 i18n 的消息源。它只适用于我的控制器。

message = messageSource.getMessage('documentProperties.notFound', [partId,jsonRequestDoc.get("typeId")] as Object[], LocaleContextHolder.locale)

当我执行上述操作时，我收到了这个服务。

Cannot invoke method getMessage() on null object

我的 messageSource 在我的服务 class 开头定义如下：

 @Autowired
 def messageSource

为了解决这个问题，我手动创建了一个服务构造函数，它从控制器接收消息源。

class CmbIdService {
 public CmbIdService(def messageSource){
        this.messageSource = messageSource
    }
}

It was working as expected, but when I started running my integration tests, I noticed that Grails did not know how to instantiate my service considering the presence of the constructor. This the message I receive when I run the Grails Integration tests.

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'cmbIdService': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'java.lang.Object' available: more than one 'primary' bean found among candidates... continue.

谁能帮帮我。我不知道该怎么办。我需要使用消息源进行国际化。我需要在服务中这样做，而不仅仅是在控制器中。我的测试需要继续工作。

谢谢！

阿尔弗雷多

Answer 1

而不是这个...

class CmbIdService {
 public CmbIdService(def messageSource){
        this.messageSource = messageSource
    }
}

这样做...

class CmbIdService {
    def messageSource
}

如果 class 在 grails-app/services/[whatever your package is]/CmbIdService.groovy 中定义，那么将自动为您创建一个实例，作为 bean 添加到应用程序上下文中，并且该实例将受到 autowire-by -名字。

编辑

下面的评论表明 OP 仍在获得 NPE。我在 https://github.com/jeffbrown/dnunesmessagesource.

提供了一个工作示例

https://github.com/jeffbrown/dnunesmessagesource/blob/d05fe05a6679351fd5ff6779aebf30b6e6f3790d/grails-app/services/dnunesmessagesource/CmbIdService.groovy

package dnunesmessagesource

import org.springframework.context.i18n.LocaleContextHolder

class CmbIdService {
    def messageSource

    String getCustomMessage() {
        messageSource.getMessage('my.custom.message', [] as Object[], LocaleContextHolder.locale)
    }
}

https://github.com/jeffbrown/dnunesmessagesource/blob/d05fe05a6679351fd5ff6779aebf30b6e6f3790d/grails-app/controllers/dnunesmessagesource/DemoController.groovy

package dnunesmessagesource


class DemoController {
    CmbIdService cmbIdService
    
    def index() {
        String message = cmbIdService.customMessage
        [customMessage: message]
    }
}

https://github.com/jeffbrown/dnunesmessagesource/blob/d05fe05a6679351fd5ff6779aebf30b6e6f3790d/grails-app/i18n/dnunes.properties

my.custom.message=This Is My Custom Message

https://github.com/jeffbrown/dnunesmessagesource/blob/d05fe05a6679351fd5ff6779aebf30b6e6f3790d/grails-app/views/demo/index.gson

model {
    String customMessage
}

json {
    message customMessage
}

一切似乎都按设计工作。

$ http :8080/demo
HTTP/1.1 200 
Content-Language: en-US
Content-Type: application/json;charset=UTF-8
Date: Wed, 31 Mar 2021 18:31:37 GMT
Transfer-Encoding: chunked
X-Application-Context: application:development

{
    "message": "This Is My Custom Message"
}

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