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README增加jackson兼容性解决方法 #126

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README增加jackson兼容性解决方法 #126

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Expand Up @@ -359,6 +359,34 @@ dependencies {
}
```

### 如何解决Jackson兼容性问题

在之前的版本中，我们出于安全考虑升级 Jackson 到`2.12`，并使用了`2.11`版本中新增的方法`readValue(String src, Class<T> valueType)`。如果你的项目所依赖的其他组件又依赖了低于`2.11`版本的 Jackson ，可能会出现依赖冲突。

我们建议有能力的开发者，升级冲突组件至较新的兼容版本。例如，issue [#125](https://github.com/wechatpay-apiv3/wechatpay-apache-httpclient/issues/125) 版本 <`2.3.x` 的 SpringBoot 官方已不再维护，继续使用可能会有安全隐患。

如果难以升级，你可以使用下面的方式指定 Jackson 版本。

#### Gradle
```groovy
implementation('com.fasterxml.jackson.core:jackson-databind') {
version {
strictly '2.12.5'
}
}
```
#### Maven
```xml
<dependencyManagement>
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依赖填写的顺序是否需要说明下？

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这里是单独的dependencyManagement依赖管理块，这个块里只需声明一个依赖，所以不用说明顺序。依赖管理块与单独的dependencies是不相关的。

<dependencies>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.12.5</version>
</dependency>
</dependencies>
</dependencyManagement>
```
### 更多常见问题

请看商户平台的[常见问题](https://pay.weixin.qq.com/wiki/doc/apiv3_partner/wechatpay/wechatpay7_0.shtml)，或者[这里](https://wechatpay-api.gitbook.io/wechatpay-api-v3/chang-jian-wen-ti)。
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