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docs: 新增QA：解决低版本 SpringBoot (<2.2.0) 引入 Sa-Token 报错的问题

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2025-04-01 05:33:10 +08:00
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sa-token-doc/more/common-questions.md
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@@ -565,9 +565,34 @@ public class SaTokenContextByPatternsRequestCondition extends SaTokenContextForS
```
### Q：过低的 SpringBoot 版本引入 Sa-Token 后报错
在低于 2.2.0 时 (不包含2.2.0本身) 的 SpringBoot 项目中引入 Sa-Token 后，项目启动时会报错：
``` txt
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cn.dev33.satoken.spring.SaBeanInject': Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [cn.dev33.satoken.spring.SaBeanInject]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/jsontype/PolymorphicTypeValidator
```
这是由于缺少 jackson 相关依赖导致的，可以手动添加以下依赖来解决：
``` xml
<!-- SpringBoot 版本过低时，需要追加的包 (低于 2.2.0 时，不包含 2.2.0 本身) -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.17.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.17.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.17.3</version>
</dependency>
```