Question

我已经构建了一些自定义marshallers，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()
    ]
}

CustomObjectMarshallers

class CustomObjectMarshallers {
    List marshallers = []

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

ErrorsMarshaller

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
        }
    }
}

我收到以下异常

无法在null对象上调用方法getMessage（）。 Stacktrace如下： java.lang.NullPointerException：无法在null对象上调用方法getMessage（） at 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） at grails.converters.JSON.convertAnother（JSON.java:162）在grails.converters.JSON.value（JSON.java:202） at grails.converters.JSON.render（JSON.java:134） at org.hri.leaverequest.CalendarController.processRequest（CalendarController.groovy：154） at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter（PageFragmentCachingFilter.java:198） at grails.plugin.cache.web.filter.AbstractFilter.doFilter（AbstractFilter.java:63） at grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter.doFilter（GrailsAnonymousAuthenticationFilter.java:53） at grails.plugin.springsecurity.web.authentication.RequestHolderAuthenticationFilter.doFilter（RequestHolderAuthenticationFilter.java:49） at grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter.doFilter（MutableLogoutFilter.java:82）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1145） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:615）在java.lang.Thread.run（Thread.java:744）

Answer 1

根据您的Grails版本（在这种情况下为2.x），您可能需要在＆＃34; Spring bean扫描＆＃34;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']

从src / groovy

1 个答案: