IDEA maven中Failed org.codehaus.mojo:exec-maven-plugin3.0.0:exec (default-cli) on project

报错：

Cannot resolve plugin org.apache.maven.plugins:maven-clean-plugin:2.5
Failed org.codehaus.mojo:exec-maven-plugin3.0.0:exec (default-cli) on project
Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:co

已尝试以下方法，没有解决：

1. 删除仓库maven_repository中的plugins，重新下载（https://blog.csdn.net/lyg9966/article/details/105904175）
2. IDEA-file-Invalidate Caches 清除缓存restart
3. conf/setting.xml换阿里云仓库 mirrors /mirrors中增加

    <mirror>
    <id>alimaven</id>
    <mirrorOf>central</mirrorOf>
    <name>aliyun maven</name>
    <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
  </mirror>
  <mirror>
    <id>aliyunpublic</id>
    <name>aliyunpublic</name>
    <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
    <mirrorOf>public</mirrorOf>       
  </mirror>
  <mirror>
    <id>centralmaven</id>
    <mirrorOf>centralmaven</mirrorOf>
    <name>centralmaven</name>
    <url>http://central.maven.org/maven2/</url>
    </mirror>

profiles /profiles中增加

<profile>
           <id>default</id>
            <repositories>
                    <repository>
                        <id>nexus</id>
                        <name>local private nexus</name>
                        <url>http://maven.aliyun.com/nexus/content/repositories/central/</url>
                        <releases>
                            <enabled>true</enabled>
                        </releases>
                        <snapshots>
                            <enabled>false</enabled>
                        </snapshots>
                    </repository>
                </repositories>
                <pluginRepositories>
                    <pluginRepository>
                        <id>nexus</id>
                        <name>local private nexus</name>
                        <url>http://maven.aliyun.com/nexus/content/repositories/central/</url>
                        <releases>
                            <enabled>true</enabled>
                        </releases>
                        <snapshots>
                            <enabled>false</enabled>
                        </snapshots>
                    </pluginRepository>
                </pluginRepositories>
            </profile>

5. 在pom 中增加exec-maven-plugin/ compiler版本

   <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.4.2</version>
                <configuration>
                    <skipTests>true</skipTests>
                </configuration>
            </plugin>
        </plugins>
    </build>

6. 新建maven quickstart工程，导入pom新增内容（https://blog.csdn.net/pcwlkpzc/article/details/106964154）

7. 之前maven-compiler 报错时以为是jdk14不兼容，重新下载jdk1.8 将preferences 中compiler 换成jdk1.8，project structure换成jdk1.8 可以解决！！！

https://blog.csdn.net/fanrenxiang/article/details/80864908

最终原因： IDEA版本2020 不兼容

解决办法参考：https://blog.csdn.net/weixin_36979214/article/details/107282951?utm_medium=distribute.pc_relevant.none-task-blog-baidujs-1

IDEA2020
jdk1.8/ 14均可用

MybatisTest.java 中将main 改成测试， 增加 @Test

public class MybatisTest {
    @Test
    public void test() throws IOException {
        /**
         * 1 读取配置文件
         * 2 创建SqlSessionFactory
         * 3 使用工厂生产SqlSession对象
         * 4 使用SqlSession创建Dao接口的代理对象
         * 5 使用代理对象执行方法
         * 6 释放资源
         */
        //1 读取配置文件
        InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");

        //2 创建SqlSessionFactory
        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
        SqlSessionFactory sqlSessionFactory = builder.build(inputStream);

        //3 使用工厂生产SqlSession对象
        SqlSession sqlSession = sqlSessionFactory.openSession();

        //4 使用SqlSession创建Dao接口的代理对象
        IUserDao userDao = sqlSession.getMapper(IUserDao.class);

        //5 使用代理对象执行方法
        List<User> users = userDao.findAll();

        for (User user : users) {
            System.out.println(user);
        }

        //6 释放资源
        sqlSession.close();
        inputStream.close();
    }
}

问题解决～～