https://stackoverflow.com/questions/22761190
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RussianActually in my case link from the comments wasn't the answer. I could not use ObjectMapper because that was done automatically for my bo other library. The solution was to make the POJO extend ArrayList.
Jackson - cannot seserialize array, UnknownLengthHttpInputStream
سؤال
I am writing an implementation of APE protocol for chat on Android. When I send request to connect the answer is:
[
{
"time": "1396265282",
"raw": "LOGIN",
"data": {
"sessid": "51da81ceb3acd4655f95d00c29d058a0"
}
},
{
"time": "1396265282",
"raw": "IDENT",
"data": {
"user": {
"casttype": "uni",
"pubid": "fd1e5426d381e5c9ac4e3b0cb32622d7",
"properties": {
"channel": "chat",
"uid": "undefined",
"type": "0",
"name": "test1426"
}
}
}
}
]
My POJO is:
public class ConnectResponse {
public BasicInfo[] response;
public static class BasicInfo {
public String time;
public String raw;
public Data data;
}
public static class Data {
public String sessionid;
public User user;
}
public static class User {
public String casttype;
public String pubid;
public Properties properties;
}
public static class Properties{
public String channel;
public String uid;
public int type;
public String name;
}
}
When parsing JSON I have exception:
03-31 13:37:09.258 16829-17365/com.miquido.vheda_android E//DefaultRequestRunner.java:138﹕ 13:37:09.257 Thread-38761 An exception occurred during request network execution :Could not read JSON: Can not deserialize instance of com.miquido.vheda_android.chat.response.ConnectResponse out of START_ARRAY token
at [Source: libcore.net.http.UnknownLengthHttpInputStream@41fa3030; line: 1, column: 1]; nested exception is org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of com.miquido.vheda_android.chat.response.ConnectResponse out of START_ARRAY token
at [Source: libcore.net.http.UnknownLengthHttpInputStream@41fa3030; line: 1, column: 1]
org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Can not deserialize instance of com.miquido.vheda_android.chat.response.ConnectResponse out of START_ARRAY token
at [Source: libcore.net.http.UnknownLengthHttpInputStream@41fa3030; line: 1, column: 1]; nested exception is org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of com.miquido.vheda_android.chat.response.ConnectResponse out of START_ARRAY token
at [Source: libcore.net.http.UnknownLengthHttpInputStream@41fa3030; line: 1, column: 1]
at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:125)
at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:147)
at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:76)
at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:655)
at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:641)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:484)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:439)
at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:340)
at com.miquido.vheda_android.chat.request.ConnectRequest.loadDataFromNetwork(ConnectRequest.java:45)
at com.miquido.vheda_android.chat.request.ConnectRequest.loadDataFromNetwork(ConnectRequest.java:23)
at com.octo.android.robospice.request.CachedSpiceRequest.loadDataFromNetwork(CachedSpiceRequest.java:45)
at com.octo.android.robospice.request.DefaultRequestRunner.processRequest(DefaultRequestRunner.java:134)
at com.octo.android.robospice.request.DefaultRequestRunner$1.run(DefaultRequestRunner.java:201)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of com.miquido.vheda_android.chat.response.ConnectResponse out of START_ARRAY token
at [Source: libcore.net.http.UnknownLengthHttpInputStream@41fa3030; line: 1, column: 1]
at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:219)
at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:212)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromArray(BeanDeserializer.java:869)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:597)
at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2723)
at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1914)
at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:122)
at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:147)
at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:76)
at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:655)
at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:641)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:484)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:439)
at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:340)
at com.miquido.vheda_android.chat.request.ConnectRequest.loadDataFromNetwork(ConnectRequest.java:45)
at com.miquido.vheda_android.chat.request.ConnectRequest.loadDataFromNetwork(ConnectRequest.java:23)
at com.octo.android.robospice.request.CachedSpiceRequest.loadDataFromNetwork(CachedSpiceRequest.java:45)
at com.octo.android.robospice.request.DefaultRequestRunner.processRequest(DefaultRequestRunner.java:134)
at com.octo.android.robospice.request.DefaultRequestRunner$1.run(DefaultRequestRunner.java:201)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
So the exception is: UnknownLengthHttpInputStream. Maybe this could be the problem: the response content type from server is text/html (I cannot change it) so I added this type to Jackson converter supported media types using - method. Could it be the reason of the error?
المحلول
نصائح أخرى
Based on your POJO, Jackson will expect a JSON like this:
{
"response": [
{
"time": "1396265282",
"raw": "LOGIN",
"data": {
"sessid": "51da81ceb3acd4655f95d00c29d058a0"
}
},
{
"time": "1396265282",
"raw": "IDENT",
"data": {
"user": {
"casttype": "uni",
"pubid": "fd1e5426d381e5c9ac4e3b0cb32622d7",
"properties": {
"channel": "chat",
"uid": "undefined",
"type": "0",
"name": "test1426"
}
}
}
}
]
}
So, you have to either change you POJO or change your response to match that.
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