Grails：值超出序列：預期模式在寫入時爲對象或陣列

我試圖使用grails.converters.JSON解析JSON對象，但出現此錯誤。Grails：值超出序列：預期模式在寫入時爲對象或陣列

代碼

def str = '{"a": "b"}' 
def json = new JSON(str)

或

def map = [:] 
map.a = "b" 
def json = map as JSON 
json = new JSON(json.toString())

正在返回此以下錯誤：

2016-11-22 14:21:34.592 ERROR --- [nio-8080-exec-9] o.g.web.errors.GrailsExceptionResolver : JSONException occurred when processing request: [GET] /test/index 
Value out of sequence: expected mode to be OBJECT or ARRAY when writing '{"a":"b"}' but was INIT. Stacktrace follows: 

java.lang.reflect.InvocationTargetException: null 
    at org.grails.core.DefaultGrailsControllerClass$ReflectionInvoker.invoke(DefaultGrailsControllerClass.java:210) 
    at org.grails.core.DefaultGrailsControllerClass.invoke(DefaultGrailsControllerClass.java:187) 
    at org.grails.web.mapping.mvc.UrlMappingsInfoHandlerAdapter.handle(UrlMappingsInfoHandlerAdapter.groovy:90) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
    at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55) 
    at org.grails.web.servlet.mvc.GrailsWebRequestFilter.doFilterInternal(GrailsWebRequestFilter.java:77) 
    at org.grails.web.filters.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:67) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: java.lang.RuntimeException: org.grails.web.converters.exceptions.ConverterException: org.grails.web.json.JSONException: Value out of sequence: expected mode to be OBJECT or ARRAY when writing '{"a":"b"}' but was INIT 
    at org.grails.web.converters.AbstractConverter.toString(AbstractConverter.java:111) 
    at grails3.TestController$$EQ3IkyX7.index(TestController.groovy:25) 
    ... 14 common frames omitted 
Caused by: org.grails.web.converters.exceptions.ConverterException: org.grails.web.json.JSONException: Value out of sequence: expected mode to be OBJECT or ARRAY when writing '{"a":"b"}' but was INIT 
    at grails.converters.JSON.value(JSON.java:193) 
    at grails.converters.JSON.render(JSON.java:119) 
    at org.grails.web.converters.AbstractConverter.toString(AbstractConverter.java:109) 
    ... 15 common frames omitted 
Caused by: org.grails.web.json.JSONException: Value out of sequence: expected mode to be OBJECT or ARRAY when writing '{"a":"b"}' but was INIT 
    at org.grails.web.json.JSONWriter.append(JSONWriter.java:142) 
    at org.grails.web.json.JSONWriter.value(JSONWriter.java:353) 
    at grails.converters.JSON.value(JSON.java:162) 
    ... 17 common frames omitted

的Grails版本：3.2.3 Java版本：1.8u45和1.8u111

來源

2016-11-22 ricardogobbo

你試過'高清JSON = JSON.parse（ '{ 「一」：「B」}'）'？ –

@EmmanuelRosa是的。它沒有工作。 – ricardogobbo

該語句本身將地圖轉換爲JSON。

def val = [a: 101, b: '100'] as JSON

你不需要做這個json = new JSON(json.toString())了

來源

2016-11-22 17:20:04

這只是一個例子。我做了這個證明，我試圖解析一個有效的json。 – ricardogobbo

您是否試圖從控制器上的請求對象獲取json內容？ –

Grails：值超出序列：預期模式在寫入時爲對象或陣列

回答

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