fasterxml: Unrecognized token ‘open’: was expecting (‘true’, ‘false’ or ‘null’)
- 代码片段
public class JsonUtil { private static final ObjectMapper MAPPER = new ObjectMapper(); public static void main(String[] args) throws Exception { String s = "testjson"; String s1 = MAPPER.readValue(s, String.class); System.out.println(s1); } }
- exception
Exception in thread "main" com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'testjson': was expecting ('true', 'false' or 'null') at [Source: java.io.StringReader@117c323d; line: 1, column: 9]
- 错误原因
fasterxml无法对这个字符串进行判断,它的处理逻辑应该是先判断这个字符串是否是boolean,因为这个字符串并不是用双引号引起来的字符串。 - 解决办法
String s = “testjson”;应改为String s = "\"testjson\"";
,此时才可被fasterxml正确理解。