一文详解Unexpected character (‘“‘ (code 34)): was expecting comma to separate Object entries的问题

╰半橙微兮° 2023-09-25 15:07 56阅读 0赞

#### 文章目录 ####

*  1. 复现问题
 *  2. 分析问题
 *  3. 解决问题
 *  4. 重要补充
 *   *  4.1 knife4j的详细教程

## 1. 复现问题 ##

今天在使用`knife4j`请求后端接口时，首次请求能够正常访问。

只是修改个参数值，就报出如下错误信息：

![在这里插入图片描述][a70829c67d9c4952b1262fa594a0a6f3.png]

org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Unexpected character ('"' (code 34)): was expecting comma to separate Object entries; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('"' (code 34)): was expecting comma to separate Object entries
     at [Source: (PushbackInputStream); line: 6, column: 4]
    	at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:389)
    	at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:342)
    	at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:185)
    	at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:158)
    	at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:131)
    	at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)
    	at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:170)
    	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
    	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
    	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894)
    	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
    	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
    	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1063)
    	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
    	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
    	......
    	......
    Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('"' (code 34)): was expecting comma to separate Object entries
     at [Source: (PushbackInputStream); line: 6, column: 4]
    	at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1840)
    	at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:712)
    	at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:637)
    	at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.nextFieldName(UTF8StreamJsonParser.java:1010)
    	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:376)
    	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159)
    	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4202)
    	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3258)
    	at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:378)
    	... 67 more

## 2. 分析问题 ##

`Unexpected character ('"' (code 34)): was expecting comma to separate Object entries`错误，来自`ChatGPT`的解释如下图：

![在这里插入图片描述][7cd791ca5bd34cb4a9629f13f3cec7eb.png]

也就是说，我的请求参数(`json格式`)有误，导致`jackson`无法解析这样的参数。

于是到接口请求的地方，查看我的请求参数，如下图所示：

![在这里插入图片描述][1247ff1c3dd6454b8f3e67bdfc70b76e.png]

若你不仔细看，你无法看到问题所在。

我是反复尝试了数字，才看到在`"id": 1`的地方，出现了问题，因为`1`后面没有加上逗号(英文的逗号)。

## 3. 解决问题 ##

由于`1`后面没有加上逗号，只要在其后面加上逗号即可，如下图所示：

![在这里插入图片描述][bfc6b7fd170d42b0af1eabb6e7892fa0.png]

重新请求后端接口，即能正常访问，如下图所示：

![在这里插入图片描述][2cb9e9401bd446fa8c8c8b028c0b275a.png]

在工作过程中，还是要仔细。不能因为一个点，浪费很长排查问题的时间。

## 4. 重要补充 ##

### 4.1 knife4j的详细教程 ###

插句题外话，关于`knife4j`的详细使用教程，可以参考博文：[全网最全的Knife4j swaggerj介绍][Knife4j swaggerj]

[a70829c67d9c4952b1262fa594a0a6f3.png]: https://img-blog.csdnimg.cn/a70829c67d9c4952b1262fa594a0a6f3.png
[7cd791ca5bd34cb4a9629f13f3cec7eb.png]: https://img-blog.csdnimg.cn/7cd791ca5bd34cb4a9629f13f3cec7eb.png
[1247ff1c3dd6454b8f3e67bdfc70b76e.png]: https://img-blog.csdnimg.cn/1247ff1c3dd6454b8f3e67bdfc70b76e.png
[bfc6b7fd170d42b0af1eabb6e7892fa0.png]: https://img-blog.csdnimg.cn/bfc6b7fd170d42b0af1eabb6e7892fa0.png
[2cb9e9401bd446fa8c8c8b028c0b275a.png]: https://img-blog.csdnimg.cn/2cb9e9401bd446fa8c8c8b028c0b275a.png
[Knife4j swaggerj]: https://blog.csdn.net/lvoelife/article/details/128114264

一文详解Unexpected character (‘“‘ (code 34)): was expecting comma to separate Object entries的问题

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