最近在尝试微服务架构下的activiti搭建。结果启动遇到了如下问题。

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APPLICATION FAILED TO START
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Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    com.baomidou.mybatisplus.core.MybatisMapperAnnotationBuilder.getLanguageDriver(MybatisMapperAnnotationBuilder.java:371)

The following method did not exist:

    com.baomidou.mybatisplus.core.MybatisConfiguration.getLanguageDriver(Ljava/lang/Class;)Lorg/apache/ibatis/scripting/LanguageDriver;

The method's class, com.baomidou.mybatisplus.core.MybatisConfiguration, is available from the following locations:

    jar:file:/C:/Users/qindp/.m2/repository/com/baomidou/mybatis-plus-core/3.3.2/mybatis-plus-core-3.3.2.jar!/com/baomidou/mybatisplus/core/MybatisConfiguration.class

The class hierarchy was loaded from the following locations:

    com.baomidou.mybatisplus.core.MybatisConfiguration: file:/C:/Users/qindp/.m2/repository/com/baomidou/mybatis-plus-core/3.3.2/mybatis-plus-core-3.3.2.jar
    org.apache.ibatis.session.Configuration: file:/C:/Users/qindp/.m2/repository/org/mybatis/mybatis/3.4.2/mybatis-3.4.2.jar


Action:

Correct the classpath of your application so that it contains a single, compatible version of com.baomidou.mybatisplus.core.MybatisConfiguration

看起来是mybatis-plus的jar包冲突了，我最开始以为是和springboot冲突，后来怀疑是与nacos冲突，尝试换版本，排除依赖等方式，找了好久都没解决。

偶然翻到一个博主关于activiti的配置，才想到可能是与activiti冲突。试了一下果然如此。修改如下，在pom的activiti包中移除mybatis。

<!--activiti基础包-->
<dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-spring-boot-starter-basic</artifactId>
    <version>${activiti.version}</version>
    <exclusions>
        <exclusion><!-- 排除activiti的mybatis，避免和外面的mybatis-plus冲突 -->
            <artifactId>mybatis</artifactId>
            <groupId>org.mybatis</groupId>
        </exclusion>
    </exclusions>
</dependency>

问题解决了，但是之前没有用微服务时，我用mybatis-plus:3.3.0和activiti:6.0.0都没有出错，同样版本用了微服务就出错了，原因不明，不止各位大佬有否知道的。