fasterxml: Unrecognized token '***': was expecting ('true', 'false' or 'null')

fasterxml: Unrecognized token ‘open’: was expecting (‘true’, ‘false’ or ‘null’)

• 代码片段

public class Test {
    static final ObjectMapper ObjMpr = new ObjectMapper();

    public static void main(String[] args) throws Exception {
        String s = "open";
        String s1 = ObjMpr.readValue(s, String.class);
        System.out.println(s1);
    }
}

• exception

Exception in thread "main" com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'open': 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 = “open”;应改为String s = "\"open\"";，此时才可被fasterxml正确理解。