从src/groovy中访问服务

Question

我已经构建了一些自定义封送器，我正在尝试访问消息服务。我有以下代码。

Resources.groovy

customObjectMarshallers(CustomObjectMarshallers){
    marshallers = [
        new PersonMarshaller(),
        new DepartmentMarshaller(),
        new ErrorsMarshaller()
    ]
}

class CustomObjectMarshallers {
    List marshallers = []

    def register(){
        marshallers.each {
            it.register()
        }
    }
}

class ErrorsMarshaller {

    @Autowired
    def MessageSource messageSource

    void register(){

        JSON.registerObjectMarshaller(FieldError){ FieldError fieldError ->

            def pMap = [:]

            fieldError.properties.each { prop, val ->
                println 'prop ' + prop
                if( prop == 'rejected_value' || prop == 'arguments' || prop == 'class' || prop == 'codes' || prop == 'code' || prop == 'bindingFailure') {
                    return
                } else if(prop == 'defaultMessage') {
                    pMap[prop] = messageSource.getMessage(val, fieldError, Locale.US)
                } else {
                    pMap[prop] = MarshallerUtils.cleanPropertyValue(val)
                }               
            }

            return pMap
        }
    }
}

我得到以下异常

无法对空对象调用方法getMessage（）。Stacktrace如下:java.lang.nullpointerException:无法在org.hri.leaverequest.marshaller.errorsmarshaller$_register_closure1_closure2.docall(errorsmarshaller.groovy:26)在org.hri.leaverequest.marshaller.errorsmarshaller$_register_closure1.docall(errorsmarshaller.groovy:21)在grails.converters.json.value(json.java:202)在ails.converters.json.render(json.java:134)在org.hri.leaverequest.calendarcontroller.processRequest（calendarcontroller.groovy:154)在grails.plugin.cache.web.filter.pagefragmentcachingfilter.doFilter（pagefragmentcachingfilter.java:198)在grails.plugin.cache.web.filter.abstractfilter.java:63)在RequestHolderAuthentdoFilter(requestholderAuthenticationFilter.java:49)在grails.plugin.springsecurity.web.authentication.logout.mutableLogoutFilter.doFilter(mutableLogoutFilter.java:82)在java.util.concurrent.threadPoolExecutor.runworker(threadPoolExecutor.java:1145)在java.util.concurrent.threadPoolExecutor$worker.run

Answer 1

根据您的Grails版本（本例中为2.x)，您可能需要在“Spring bean扫描”中包含这些包。查看config.groovy并添加它们：

// packages to include in Spring bean scanning
grails.spring.bean.packages = ['com.example.my.package.here']