Spring MVC的：通過客戶端發送的請求是語法不正確

當發送JSON請求到服務器，我經常通過這條消息映入眼簾：Spring MVC的：通過客戶端發送的請求是語法不正確

通過客戶端發送的請求是語法不正確（）。

通常這是一個不正確的屬性，因爲JSON映射到的對象不包含它，所以控制器沒有期望傳遞這個屬性。

查找參數是不必要的耗時 - 有沒有辦法獲得更多信息，甚至可能是異常的堆棧跟蹤？我試過在調試模式下運行，並且使用Jackson作爲我的JSON（de）serialiser。

2012-10-20 Aram Kocharyan

嘗試將'org.springframework'的登錄級別（假設您正在使用log4j或equiv。）更改爲'DEBUG'。 – nickdos

@nickdos歡呼，將嘗試 –

錯誤*客戶端發送的請求在語法上不正確「**在大多數情況下，意味着傑克遜無法脫鹽（將json字符串轉換爲對象），因爲缺省構造函數已丟失在你的情況下，缺少默認的構造函數，你有參數化的構造函數，它覆蓋默認和傑克遜不能創建對象 – abosancic

如果你的消費是從外部API，如果你想從不必要的元素屏蔽你的控制器中的數據/你不需要你可以在POJO類使用下面的註釋

@JsonIgnoreProperties(ignoreUnknown = true)

，或者你的屬性可以將其設置爲全球

//jackson 2.0 
jsonObjectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

來源

2013-02-03 07:20:51 Sudhakar

@Aram Kocharyan你試過這個 – Sudhakar

@JsonIgnoreProperties（ignoreUnknown = true）工作我 –

錯誤*客戶端發送的請求在語法上不正確「**在大多數情況下意味着傑克遜無法脫鹽（將json字符串轉換爲對象），因爲缺少構造函數。 – abosancic

舊案例，我現在無關緊要，但對於其他類似麻煩的人，我會添加此條目。

檢查您有雙引號，而不是單引號。也嘗試逃離它們。

我用我的應用程序curl爲我的測試json請求。

我的JSON是這樣

{ 'name' : 'somedata', 'town':'some town' }

，它只是在我的眼前爆炸了。

「客戶端發送的請求在語法上不正確」是一般錯誤。所以我把它從單引號改爲雙引號，不行。然後，我嘗試在單引號前面加反斜槓，但仍然沒有。然後將其更改爲雙引號的反斜槓，然後立即顯示！

curl -i -H "Accept: application/json" -H "Content-Type: application/json" \ 
http://localhost:8077/dra/dump.json \ 
-X PUT -d "{\"name\" : \"My Name\", \"town\":\"My Town\"}"

來源

2013-02-20 12:41:49 OddBeck

大多數示例都使用'-d'{「x」：「y」} '，在Windows上它不起作用，我不得不用你的方式使它工作。 Thx發佈。 – Sydney

要獲取有關調試日誌的詳細信息/堆棧跟蹤反過來在log4j.properties春季網絡

log4j.logger.org.springframework.web =調試

來源

2014-07-21 01:44:24 Farm

非常感謝，這就是我正在尋找的（y） – webmaster

我面對同樣的錯誤，幾天後，最終啓用了@Farm提到的調試日誌，並能夠看到這個問題的原因。我有一個Person對象被張貼在JSON從JSP到春天控制器，如下圖所示： -

@RequestMapping(value = "/get", method = RequestMethod.POST) 
public @ResponseBody 
Person getPerson(@RequestBody Person person) { 
    // System.out.println("inside get::::::::"); 
    System.out.println("city:=" + person.getResidenceAddress().getCity()+" " 
      + "name:= " + person.getFullName().getFirstName()); 
    // Person prsn = personService.getPerson(person); 

    /* 
    * Person prsn = new Person(); prsn.setId(1); ResponseDecorator rd = new 
    * ResponseDecorator(prsn, true); 
    */return person; 
} 
// Person Object 
class Person{ 
private Name fullName; 
private Address residenceAddress; 
private Address mailingAddress; 
private Gender gender; 
private MaritalStatus maritalStatus; 
private Integer creditRating; 

} 

//Address Object 
public class Address { 
private String streetNo; 
private String streetName; 
private String suburb; 
private String city; 
private String state; 
private String country; 
private Integer pinCode; 
private AddressType addressType; 
} 


json post from jsp:- 
//create JSON 
var json = { 
"id": id, 
     "fullName":{"firstName":firstName,"middleName":middleName,"surName":  surName}, 
"residenceAddress":{ "streetNo": streetNo, 
         "streetName": streetName, 
         "suburb": suburb, 
         "city": city, 
         "state": state, 
         "country": country, 
         "pinCode": pincode 
         } 
     }; 

var dataString = JSON.stringify(json); 
//alert(dataString); 


$.ajax({ 
    headers: { 
     Accept : "text/plain; charset=utf-8, application/json"}, 
    url: "/myservice/get", 
    type: 'POST', 
    dataType: 'json', 
    //data : "{  }", 
    data: dataString, 
    contentType: 'application/json', 
    mimeType: 'application/json', 
    success: function(data) { 
     alert(data); 
    }, 
    error:function(data,status,er) { 
     alert("error: "+data+" status: "+status+" er:"+er); 
    } 
});

上提交錯誤是400錯誤的請求，並沒有其他線索，爲什麼它是失敗的。上啓用服務器上的調試模式下，我可以看到下面的錯誤堆棧跟蹤： -

**00:53:42,294 DEBUG RequestResponseBodyMethodProcessor:117 - Reading [com.foo.assignment.model.Person] as "application/json" using [org.springf[email protected]1813fb] 
00:53:42,310 DEBUG ServletInvocableHandlerMethod:159 - Error resolving argument [0] [type=com.foo.assignment.model.Person] 
HandlerMethod details: 
Controller [com.foo.assignment.controller.PersonController] 
Method [public com.foo.assignment.model.Person com.foo.assignment.controller.PersonController.getPerson(com.foo.assignment.model.Person)] 
org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: No suitable constructor found for type [simple type, class com.foo.assignment.model.Address]: can not instantiate from JSON object (need to add/enable type information?) 
at [Source: [email protected]; line: 1, column: 98] (through reference chain: com.foo.assignment.model.Person["residenceAddress"]); nested exception is org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class com.foo.assignment.model.Address]: can not instantiate from JSON object (need to add/enable type information?) 
at [Source: [email protected]; line: 1, column: 98] (through reference chain: com.foo.assignment.model.Person["residenceAddress"]) 
    at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:127) 
    at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:153) 
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:120) 
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:91) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:71) 
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:74) 
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:155) 
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:117) 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) 
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:650) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Thread.java:722) 
Caused by: org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class com.foo.assignment.model.Address]: can not instantiate from JSON object (need to add/enable type information?) 
at [Source: [email protected]; line: 1, column: 98] (through reference chain: com.foo.assignment.model.Person["residenceAddress"]) 
    at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163) 
    at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObjectUsingNonDefault(BeanDeserializer.java:746) 
    at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:683) 
    at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:580) 
    at org.codehaus.jackson.map.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:299) 
    at org.codehaus.jackson.map.deser.SettableBeanProperty$MethodProperty.deserializeAndSet(SettableBeanProperty.java:414) 
    at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:697) 
    at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:580) 
    at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2732) 
    at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1923) 
    at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:124) 
    ... 37 more 
00:53:42,310 DEBUG ExceptionHandlerException**

在地址對象添加一個默認的構造函數解決了這個錯誤。並且使用谷歌附加郵差（插件https://chrome.google.com/webstore/detail/postman/fhbjgbiflinjbdggehcddcbncdddomop?hl=en）確實幫助我快速測試了我的更改。

來源

2015-08-26 15:04:24 kunal

問題出在您的POJO上，請將服務器日誌級別保持爲調試級別並檢查錯誤。這將主要與某些領域和領域類型不匹配有關。

來源

2016-05-28 10:50:45 Bot

歡迎來到StackOverflow。您必須更詳細地說明您的迴應，以更好地幫助用戶解決問題 – darkomen

使用嵌套類時，也會發生此錯誤。

class One { 
    some code.. 

    public class NestedOne { 
     private attr; 

     public NestedOne() { 
      // default constructor 
     } 
    } 
}

，然後有 @RequestMapping(value = "/something") public String someControllerMethod(@RequestBody One.NestedOne nested) { ... }

傑克遜則無法識別NestedOne（）作爲默認構造函數和搜索One.NestedOne（）構造函數。

來源

2017-09-20 14:12:06 stove

Spring MVC的：通過客戶端發送的請求是語法不正確

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