I am trying to validate a simple JSON body using Jackson, where I am storing the JSON request as a String in "dataJson" variable.
public void unmarshal(InputStream is) throws Exception {
// this will contain my actual json string
String dataJson= StUtil.toString(is);
System.out.println(dataJson);
//parse json string
String response = objectMapper.readValue(dataJson, String.class);
System.out.println(response);
}
SUtil.toString(InputStream is) method:
public static String toString(final InputStream is) {
final BufferedReader br = new BufferedReader(new InputStreamReader(is));
final StringBuffer buffer = new StringBuffer();
try {
for (String line; (line = br.readLine()) != null; ) {
buffer.append(line);
}
} catch (IOException ioe) {
}
return buffer.toString();
}
I am learning the validation part using Jackson but it throws error/exception on line
String response = objectMapper.readValue(dataJson, String.class);
And below is the exception I am getting -
Exception: "org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.lang.String out of START_OBJECT token"
I wanted to learn what wrong am I doing. Any help on this would be appreciated.
JSON Request:
{"username" : "my_username","password" : "my_password","validation-factors":{"validationFactors":[{"name":"remote_address","value":"127.0.0.1"}]}}
A JSON String maps to a Java String (and vice versa), but a JSON object does not map to a Java String, which is what you are trying to do with readValue.
If you're simply trying to validate the JSON, use something like
objectMapper.readTree(dataJson);
and ignore the result. The call will have thrown an exception if it failed to parse.
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