No content to map due to end-of-input jackson parser

Question

I am getting this response from the server   status   true   msg   success    I am trying to parse this json string using Jackson parser library but somehow I am facing mapping-exception stating   com fasterxml jackson databind JsonMappingException  No content to map due to end-of-input  at  Source  java io StringReader 421ea4c0  line  1  column  1    Why do we get this kind of exceptions   How to understand what is causing this exception   I am trying to parse using following way   StatusResponses loginValidator   null   ObjectMapper objectMapper   new ObjectMapper    objectMapper configure Feature AUTO CLOSE SOURCE  true    try       String res   result getResponseAsString       status   true   msg   success       loginValidator   objectMapper readValue result getResponseAsString    StatusResponses class     catch  Exception e        e printStackTrace        StatusResponse class   JsonInclude JsonInclude Include NON NULL   JsonPropertyOrder    status   msg     public class StatusResponses         JsonProperty  status       public String getStatus             return status              JsonProperty  status       public void setStatus String status            this status   status              JsonProperty  msg       public String getMessage             return message              JsonProperty  msg       public void setMessage String message            this message   message              JsonProperty  status       private String status        JsonProperty  msg       private String message       private Map lt String  Object gt  additionalProperties   new HashMap lt String  Object gt           JsonGetter     public Map lt String  Object gt  getAdditionalProperties             return additionalProperties              JsonSetter     public void setAdditionalProperties Map lt String  Object gt  additionalProperties            this additionalProperties   additionalProperties

User · Answer

I could fix this error  In my case  the problem was at client side  By mistake I did not close the stream that I was writing to server  I closed stream and it worked fine  Even the error sounds like server was not able to identify the end-of-input   OutputStream out   new BufferedOutputStream urlConnection getOutputStream     out write jsonstring getBytes     out close       This is what I did

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In my case I was reading the stream in a jersey RequestEventListener I created on the server side to log the request body prior to the request being processed  I then realized that this probably resulted in the subsequent read to yield no string  which is what is passed over when the business logic is run   I verified that to be the case   So if you are using streams to read the JSON string be careful of that

User · Answer

The problem for me was that I read the response twice as follows  System out println response body   string     getSucherResponse   objectMapper readValue response body   string    GetSucherResponse class    However  the response can only be read once as it is a stream

User · Answer

I got this error when sending a GET request with postman  The request required no parameters  My mistake was I had a blank line in the request body

User · Answer

This error is sometimes  often   hiding the real problem  a failure condition could be causing the content to be incorrect  which then fails to deserialize  In my case  today  I was making HTTP calls and  foolishly  omitted to check the HTTP status code before trying to unmarshal the body of the response   gt  my real problem was actualy that I had some authentication error  which caused a 401 Unauthorized to be sent back to me  with an empty body  Since I was unmarshalling that empty body directly without checking anything  I was getting this No content to map due to end-of-input  without getting any clue about the authentication issue

User · Answer

For one   JsonProperty  status   and  JsonProperty  msg   should only be there only when declaring the fields  not on the setters and geters   In fact  the simplest way to parse this would be   JsonAutoDetect    if you don t want to have getters and setters for each JsonProperty public class StatusResponses        JsonProperty  status      private String status       JsonProperty  msg      private String message

User · Answer

import com fasterxml jackson core JsonParser Feature  import com fasterxml jackson databind ObjectMapper   StatusResponses loginValidator   null   ObjectMapper objectMapper   new ObjectMapper    objectMapper configure Feature AUTO CLOSE SOURCE  true    try       String res   result getResponseAsString       status   true   msg   success       loginValidator   objectMapper readValue res  StatusResponses class    replaced result getResponseAsString   with res   catch  Exception e        e printStackTrace        Don t know how it worked and why it worked     but it worked

User · Answer

I had a similar error today and the issue was the content-type header of the post request  Make sure the content type is what you expect  In my case a multipart form-data content-type header was being sent to the API instead of application json

User · Answer

I know this is weird but when I changed GetMapping to PostMapping for both client and server side the error disappeared   Both client and server are Spring boot projects

User · Answer

A simple fix could be Content-Type  application json  You are probably making a REST API call to get the response   Mostly you are not setting  Content-Type  application json when you the request   Content-Type  application x-www-form-urlencoded will be chosen which might be causing this exception

User · Answer

In my case the problem was caused by my passing a null InputStream to the ObjectMapper readValue call   ObjectMapper objectMapper       InputStream is   null     The code here was returning null  Foo foo   objectMapper readValue is  Foo class    I am guessing that this is the most common reason for this exception

[java] No content to map due to end-of-input jackson parser

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