无法将JSON映射到Java bean

我收到错误：

线程“main”中的异常org.springframework.http.converter.HttpMessageNotReadableException：无法读取JSON：无法从START_ARRAY令牌中反序列化com.zee.FilterVO的实例.在[来源：sun.net.www.protocol.http.HttpURLConnection$HttpInputStream@1b54362; line：1,column：1];嵌套异常是org.codehaus.jackson.map.JsonMappingException ::无法从START_ARRAY令牌中反序列化com.zee.FilterVO的实例

Java调用获取JSON：

ResponseEntity


用于映射JSON的Java Bean：

public class FilterVO {

    private String userName;
    private String expirationTime;
    private String lastMatchedTime;
    private String state;
    private Integer matchedTodayCount;
    private Boolean useRegEx;
    private Listirs;

    getters and setters....
}

JSON我想要得到的：

[{
    "userName": "Z111111","expirationTime": "2015-03-15T14:00:00.000-0400","activationTime": "1969-12-31T19:00:00.000-0500","hosts": ["aa","bb"],"matchStrings": [" aa is not running"," bb is not running"],"useRegEx": false,"nameValuePairs": {
        "KEY VALUE": "asasa","PROGRAM": "dsds","REGION": "dfsffs"
    },"objectId": "SOMEID:20141015140803579-802","matchedTodayCount": 190,"lastMatchedTime": "2015-03-09T07:53:20.366-0400","state": "ACTIVE","description": "Blah Blah Blah..."
}]


Initially I thought I am facing this issue because of deserialization of one element Array. So I modified my java code.

private void getFilter() {
        RestTemplate restTemplate = getCustomrestTemplate();
        HttpHeaders headers = new HttpHeaders();
        headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
        headers.set("access-token",getAccesstoken());
        httpentityhttpentityarameters",headers);
        ResponseEntityomrestTemplate() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationConfig.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY,true);     
        MappingJacksonHttpMessageConverter messageConverter = new MappingJacksonHttpMessageConverter();
        messageConverter.setobjectMapper(mapper);
        List

我仍然得到同样的错误.
我在我的类路径中有以下杰克逊罐子：

jackson-annotations-2.5.1.jar
jackson-core-2.5.1.jar
jackson-core-asl-1.9.13.jar
jackson-databind-2.5.1.jar
jackson-datatype-joda-2.5.1.jar
jackson-mapper-asl-1.9.13.jar

完整堆栈跟踪：

Exception in thread "main" org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Can not deserialize instance of com.zee.FilterVO out of START_ARRAY token
 at [Source: sun.net.www.protocol.http.HttpURLConnection$HttpInputStream@bc5596; line: 1,column: 1]; nested exception is org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of com.zee.FilterVO out of START_ARRAY token
 at [Source: sun.net.www.protocol.http.HttpURLConnection$HttpInputStream@bc5596; line: 1,column: 1]
    at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readJavaType(MappingJacksonHttpMessageConverter.java:179)
    at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.read(MappingJacksonHttpMessageConverter.java:171)
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:94)
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:693)
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:679)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:496)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:465)
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:416)
    at com.fidelity.selfservice.test.JMagicRestAPI.getFilter(JMagicRestAPI.java:63)
    at com.fidelity.selfservice.test.JMagicRestAPI.main(JMagicRestAPI.java:46)
Caused by: org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of com.zee.FilterVO out of START_ARRAY token
 at [Source: sun.net.www.protocol.http.HttpURLConnection$HttpInputStream@bc5596; line: 1,column: 1]
    at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163)
    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:875)
    at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:597)
    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.readJavaType(MappingJacksonHttpMessageConverter.java:176)
    ... 9 more


最佳答案
问题是你正在获得一个JSON数组,但是你正试图用你的情况下的POJO,FilterVO反序列化那个JSON.
尝试更改此行：

ResponseEntity

通过这个：

ResponseEntityarameterizedTypeReference

现在你将有一个List< FilterVO>跟…共事.


                
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无法将JSON映射到Java bean

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