SpringBoot中， mybatis中使用 generateor逆向生成工程，报错：Caused by: java.lang.ClassNotFoundException: tk.mybatis.

错误显示： 

java.lang.RuntimeException: Cannot instantiate object of type tk.mybatis.mapper.generator.MapperPlugin
    at org.mybatis.generator.internal.ObjectFactory.createInternalObject(ObjectFactory.java:182)
    at org.mybatis.generator.internal.ObjectFactory.createPlugin(ObjectFactory.java:219)
    at org.mybatis.generator.config.Context.generateFiles(Context.java:500)
    at org.mybatis.generator.api.MyBatisGenerator.generate(MyBatisGenerator.java:269)
    at org.mybatis.generator.api.MyBatisGenerator.generate(MyBatisGenerator.java:139)
    at com.lemon.utils.GeneratorDisplay.generator(GeneratorDisplay.java:25)
    at com.lemon.utils.GeneratorDisplay.main(GeneratorDisplay.java:32)
Caused by: java.lang.ClassNotFoundException: tk.mybatis.mapper.generator.MapperPlugin
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.mybatis.generator.internal.ObjectFactory.internalClassForName(ObjectFactory.java:148)
    at org.mybatis.generator.internal.ObjectFactory.createInternalObject(ObjectFactory.java:178)
    ... 6 more
 

错误原因：

Maven 中的mybatis、mapper、pagehelper版本号过低或者过高不匹配

 用这组试试：（可以试试其他的最新版本）

		<!--mybatis-->
		<dependency>
		<groupId>org.mybatis.spring.boot</groupId>
		<artifactId>mybatis-spring-boot-starter</artifactId>
		<version>1.3.1</version>
	</dependency>
		<!--mapper-->
		<dependency>
		<groupId>tk.mybatis</groupId>
		<artifactId>mapper-spring-boot-starter</artifactId>
		<version>1.2.4</version>
	</dependency>
		<!--pagehelper-->
		<dependency>
		<groupId>com.github.pagehelper</groupId>
		<artifactId>pagehelper-spring-boot-starter</artifactId>
		<version>1.2.3</version>
	</dependency>