Question

在eclispe中运行以下代码时出现此错误

SpringXDTemplate xdTemplate = new SpringXDTemplate(new URI("http://my.ip:9393"));
List<JobExecutionInfoResource> listJobExecutions = xdTemplate.jobOperations().listJobExecutions();

我使用的是spring-xd版本1.3.1及以下版本是错误的堆栈跟踪：

Exception in thread "main" org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Can not deserialize instance of org.springframework.xd.rest.domain.JobExecutionInfoResource[] out of START_OBJECT token
 at [Source: sun.net.www.protocol.http.HttpURLConnection$HttpInputStream@4478de9f; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of org.springframework.xd.rest.domain.JobExecutionInfoResource[] out of START_OBJECT token
 at [Source: sun.net.www.protocol.http.HttpURLConnection$HttpInputStream@4478de9f; line: 1, column: 1]
    at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.readJavaType(MappingJackson2HttpMessageConverter.java:228)
    at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.read(MappingJackson2HttpMessageConverter.java:220)
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:95)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:553)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:506)
    at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:243)
    at org.springframework.xd.rest.client.impl.JobTemplate.listJobExecutions(JobTemplate.java:145)
    at com.citiustech.hscale.dataIngestion.App.main(App.java:20)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of org.springframework.xd.rest.domain.JobExecutionInfoResource[] out of START_OBJECT token
 at [Source: sun.net.www.protocol.http.HttpURLConnection$HttpInputStream@4478de9f; line: 1, column: 1]
    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:164)
    at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:691)
    at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:685)
    at com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer.handleNonArray(ObjectArrayDeserializer.java:222)
    at com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer.deserialize(ObjectArrayDeserializer.java:133)
    at com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer.deserialize(ObjectArrayDeserializer.java:18)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2993)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2158)
    at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.readJavaType(MappingJackson2HttpMessageConverter.java:225)
    ... 7 more

Answer 1

实际上这是jar问题。在代码中我使用的是rest-client jar 1.0.4，我的spring xd版本是1.3.1。此外，最新的rest-client jar（1.3.1）在maven中不可用，但在spring-xd的部署文件夹中也是如此。

https://mvnrepository.com/artifact/org.springframework.xd/spring-xd-rest-client

无法读取JSON：无法反序列化START_OBJECT令牌中的org.springframework.xd.rest.domain.JobExecutionInfoResource []实例

1 个答案: