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java.lang.RuntimeException: Cannot instantiate object of type tk.mybatis.mapper.generator.MapperPlugin

D:\development\java\bin\java "-javaagent:D:\development\IDEA\IntelliJ IDEA 2017.1.2\lib\idea_rt.jar=58878:D:\development\IDEA\IntelliJ IDEA 2017.1.2\bin" -Dfile.encoding=UTF-8 -classpath 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com.example.springBoot.com.test.utils.GeneratorDisplay
Wed Aug 15 14:42:05 CST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
java.lang.RuntimeException: Cannot instantiate object of type tk.mybatis.mapper.generator.MapperPlugin
    at org.mybatis.generator.internal.ObjectFactory.createInternalObject(ObjectFactory.java:184)
    at org.mybatis.generator.internal.ObjectFactory.createPlugin(ObjectFactory.java:221)
    at org.mybatis.generator.config.Context.generateFiles(Context.java:491)
    at org.mybatis.generator.api.MyBatisGenerator.generate(MyBatisGenerator.java:234)
    at org.mybatis.generator.api.MyBatisGenerator.generate(MyBatisGenerator.java:133)
    at com.example.springBoot.com.test.utils.GeneratorDisplay.generator(GeneratorDisplay.java:25)
    at com.example.springBoot.com.test.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:331)
    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:150)
    at org.mybatis.generator.internal.ObjectFactory.createInternalObject(ObjectFactory.java:180)
    ... 6 more

Process finished with exit code 0

慕粉1749239064

2018-08-15

源自：SpringBoot开发常用技术整合  8-1

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4 回答

qq_漆阳_0
2019-09-02

我也遇到了这个问题，按照你的做法也ok了，但是还是不明白为什么

0 回复 有任何疑惑可以回复我~
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慕雪6104141
2018-10-31

我也遇到了相同的问题，在pom.xml中添加，解决了

<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper</artifactId>
    <version>4.0.3</version>
</dependency>


2 回复 有任何疑惑可以回复我~
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hemimTNT
2018-08-30

版本号不对，访问github上的readme.md的版本

0 回复 有任何疑惑可以回复我~
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韦煾
2018-08-18

ClassNotFoundException肯定是jar包问题，请看下mapper-3.5.3.jar包里的这个类反编译后能否打开。

如果还是不行，换下tk.mybatis的其他版本

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java.lang.RuntimeException: Cannot instantiate object of type tk.mybatis.mapper.generator.MapperPlugin

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