[QUESTION]反序列化 JSONString 为接口时，default 方法调用失败的问题

[Doghole]

请描述您的问题

• JSONString 反序列化为接口时，若接口默认方法返回值非基本类型，则该值为 null？
• JSON/JSONString 反序列化为接口时，若接口默认方法非 get/is/hashCode... 则提示 This method 'xxx' is not a getter？

期望

所有输出都为 bob

示例代码

    public static void main(String[] args) throws Exception {
        User user = new User("bob");
        JSONObject userJsonObject = JSONObject.from(user, JSONWriter.Feature.IgnoreNonFieldGetter);
        String userJsonString = JSONObject.toJSONString(user);
        
        // ...
        // transport via http/redis/file
        // ...
        
        // Normal interface method call
        LivingObject normal = new User("bob");
        log.info(normal.getSignature().toString());            // -> "bob"
        log.info(normal.getSignatureString());                 // -> "bob"
        log.info(normal.withSignatureString());                // -> "bob"

        // Normal deserialize
        LivingObject deserializeLiving = userJsonObject.to(LivingObject.class);
        log.info(deserializeLiving.getSignature().toString()); // -> "bob"
        log.info(deserializeLiving.getSignatureString());      // -> "bob"
        log.info(deserializeLiving.withSignatureString());     // -> This method 'withSignatureString' is not a getter

        // Unknown instance type
        LivingObject living = JSONObject.parseObject(userJsonString, LivingObject.class);
        log.info(living.getSignature().toString());            // -> "null"
        log.info(living.getSignatureString());                 // -> "bob"
        log.info(living.withSignatureString());                // -> This method 'withSignatureString' is not a getter
    }
    
    public static interface LivingObject {
        
        String getName();
        
        String withName();
        
        public default Signature getSignature() {
            return new Signature(getName());
        }

        public default String getSignatureString() {
            return new Signature(getName()).toString();
        }

        public default String withSignatureString() {
            return withName();
        }
        
    }
    
    public static class Signature {
        
        private String sign;
        
        public Signature(String sign) {
            this.sign = sign;
        }
        
        @Override
        public String toString() {
            return sign;
        }
    }
    
    public static class User implements LivingObject {

        private String name;
        
        public User(String name) {
            this.name = name;
        }

        public String getName() {
            return name;
        }
        
        public String withName() {
            return name;
        }
    }

[wenshao]

https://github.com/alibaba/fastjson2/releases/tag/2.0.29
请用新版本