前言

1. 公司的微服务框架代码里面集成了一些maven依赖，jackson-databind的版本是2.9.8
2. 之前在使用的时候，直接在pom文件里改成了2.9.9版本，覆盖了原有框架里的低版本
3. 现在，想换成2.13.1版本，在pom文件里将版本改高，项目无法启动，报错

<!-- 公司框架里的2.9.10依赖 -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.10</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.9.10</version>
</dependency>
<!-- 原本pom文件里的2.9.9依赖，此处应该是需求，加了jackson-core依赖 -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.9.9</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.9</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.9.9</version>
</dependency>
<!-- 现在修改之后的2.13.1依赖 单纯把jackson-core和jackson-databind改成了2.13.1版本 -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.13.1</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.1</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.13.1</version>
</dependency>
<!-- 报错 -->
Caused by: java.lang.ClassNotFoundException Create breakpoint : com.fasterxml.jackson.annotation.JsonKey
at java.net.URLClassLoader.findclass(URLClassLoader.java: 382)
at java.lang.classLoader.loadclass(classLoader.java:424)
at java.lang.ClassLoader.loadclass(classLoader .java: 357)
...63 common frames omitted

原因分析

可能是依赖没有导全，导致新旧版本依赖有冲突，造成的结果是找不到某个类或者方法
参考文章：
https://blog.csdn.net/Mustang_carrot/article/details/108364614
https://www.jianshu.com/p/4bd355715419

解决

如果是相互依赖的话， 就直接把Jackson的三个模块：jackson-core、jackson-annotations、jackson-databind全部导入1.13.1的版本

	<!-- jackson -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>1.13.1</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>1.13.1</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>1.13.1</version>
    </dependency>