Jackson Unexpected character ('h' (code 104)): expected a valid value

Question

I am accessing a REST API using an URL which gives me the following JSON result: ``` {"size":1,"filter":{"applicationName":"xx.x1", "fromTimestamp":1261746800000, "toTimestamp":1361833200000, "company":"xx", "groupedBy":"COMPANY_APPLICATION"}, "values"[{"applicationName":"xx.x1","count":17,"company":"xx"}], "start":0,"limit":25,"lastPage":true} ``` Using Jackson i try to parse the json this way: ``` ObjectMapper mapper = new ObjectMapper(); try { ErrorDataRest error = mapper.readValue(url, ErrorDataRest.class); Map<String,Object> map = mapper.readValue(url, Map.class); ``` Dosn't matter if i use the first or the second, i get this exception: ``` dk.jyskebank.jee.core.exception.JyskeSystemException: Auto generated exception at dk.sd.dumpmonitor.domainservice.RestErrorServiceBean.queryRESTurl(RestErrorServiceBean.java:46) at service.RestErrorServiceTest.testQueryRESTurl(RestErrorServiceTest.java:19) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMeth…

Accepted Answer

I'm guessing your variable `url` is a `String`, rather than an `URL`, so Jackson is parsing the URL as if it was an actual JSON string. This would explain the "Unexpected character 'h'", as that is presumably the first letter of your URL (i.e. http... something.) The code "104" corresponds to the ASCII value of "h".

If you use `mapper.readValue(new URL(url), ErrorDataRest.class);` does it work?

Jackson Unexpected character ('h' (code 104)): expected a valid value

Solution

Problem