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奇怪的 JSONException: syntax error, expect {, actual int #4526

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codeworkerx opened this issue Aug 1, 2024 · 1 comment
Open

奇怪的 JSONException: syntax error, expect {, actual int #4526

codeworkerx opened this issue Aug 1, 2024 · 1 comment

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@codeworkerx
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版本:
fastjson-version 1.2.83
接口描述:
curl --location --request POST 'http://localhost:8080/fj' \ --header 'Content-Type: application/json' \ --data-raw '{ "auditStatus": "1", "message": "这是审批意见啊", "ids": [63] }'
接口定义的参数ids是集合形式,但是前端错误传递了数字类型,发现两种不同的入参顺序,出现了不同的结果
调用参数一:
{"auditStatus":"1","message":"这是审批意见啊","ids":63}
接口正常响应,fastjson将ids的入参处理成了数组,故接口无报错。
调用参数二:
{"auditStatus":"1","ids":63,"message":"这是审批意见啊"}
调整了顺序,此时接口报错,提示:
com.alibaba.fastjson.JSONException: syntax error, expect {, actual int, pos 25, fastjson-version 1.2.83

调试了源码,发现了这点区别
参数一:
image
参数二:
image

JavaBeanDeserializer.deserialze()方法中,当 token=2时,某些情况会触发以下代码
image
导致最终出现异常。

感觉有点奇怪,
public <T> T deserialze(DefaultJSONParser parser, Type type, Object fieldName) { return deserialze(parser, type, fieldName, 0); }
在调用这个方法时,没debug下去。

@morn-0
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morn-0 commented Aug 8, 2024

和这个 #4127 有关系吗

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