String / JSON 转 java对象卡掉

本应该控制台输出
product0:null
product1：(这里是product的内容)

System.out.println("product0:"+product);
JSONObject parseObject = JSONObject.parseObject(productStr);
product = JSONObject.toJavaObject(parseObject, Product.class);
System.out.println("product1:"+product);

```Product product = null;
```try {
            String productStr =  String.valueOf(request.getParameter("productStr"));
            System.out.println("productstr------>"+productStr);

            //System.out.println("productstr:----------->"+productStr);
            // 尝试获取前端传过来的表单string流并将其转换成Product实体类
            System.out.println("product0:"+product);
            JSONObject parseObject = JSONObject.parseObject(productStr);
            //product = mapper.readValue(productStr, Product.class);
            product = JSONObject.toJavaObject(parseObject, Product.class);
            System.out.println("product1:"+product);
        }

product = JSON.parseObject(productStr,Product.class);
我是这样转的

https://blog.csdn.net/u011909918/article/details/87968014

使用fastjson 去做

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.7</version>
</dependency>

String productStr =  String.valueOf(request.getParameter("productStr"));
JSONObject productJson = JSONObject.parseObject(productStr);
Product product = JSON.toJavaObject(productJson,Product.class);