2. 程式人生 > >MyBatis Generator報錯：Cannot instantiate object of type

MyBatis Generator報錯：Cannot instantiate object of type

阿新 • • 發佈：2019-01-21

1.錯誤資訊

[ERROR] Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate (default-cli) on project myssm: Execution default-cli of goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate failed: Cannot instantiate object of type: ClassNotFoundException -> [Help 1
 
]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate (default-cli) on project myssm: Execution default-cli of goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate failed: Cannot instantiate object of type 
    at org.apache
 
.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder
 
.buildProject(LifecycleModuleBuilder.java:116)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-cli of goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate failed: Cannot instantiate object of type 
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
    ... 21 more
Caused by: java.lang.RuntimeException: Cannot instantiate object of type 
    at org.mybatis.generator.internal.ObjectFactory.createInternalObject(ObjectFactory.java:217)
    at org.mybatis.generator.codegen.mybatis3.IntrospectedTableMyBatis3SimpleImpl.createJavaClientGenerator(IntrospectedTableMyBatis3SimpleImpl.java:73)
    at org.mybatis.generator.codegen.mybatis3.IntrospectedTableMyBatis3Impl.requiresXMLGenerator(IntrospectedTableMyBatis3Impl.java:304)
    at org.mybatis.generator.config.Context.validate(Context.java:229)
    at org.mybatis.generator.config.Configuration.validate(Configuration.java:94)
    at org.mybatis.generator.api.MyBatisGenerator.<init>(MyBatisGenerator.java:118)
    at org.mybatis.generator.maven.MyBatisGeneratorMojo.execute(MyBatisGeneratorMojo.java:200)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
    ... 22 more
Caused by: java.lang.ClassNotFoundException: 
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.mybatis.generator.internal.ObjectFactory.internalClassForName(ObjectFactory.java:169)
    at org.mybatis.generator.internal.ObjectFactory.createInternalObject(ObjectFactory.java:213)
    ... 29 more

2.錯誤分析

在MyBatis-Generator的配置檔案generatorConfig.xml中，沒有給javaClientGenerator標籤配置正確的type屬性。示例：

<!--JavaDao層介面(XxxxDao.java)生成配置 targetProject+targetPackage構成全路徑-->
<javaClientGenerator targetPackage="pers.hanchao.myssm.test.generator.dao" targetProject="src\main\java" type="">
    <!--是否允許建立子包（對應MySql的scheme）-->
    <property name="enableSubPackages" value="true"/>
</javaClientGenerator>

3.錯誤解決

給javaClientGenerator標籤配置正確的type屬性即可。
使用的targetRuntime="MyBatis3Simple"，有以下兩種可選type。

  • XMLMAPPER：生成的物件是 MyBatis 3.x 對映器基礎結構的 Java介面和XML對映檔案。
  • ANNOTATEDMAPPER：生成的物件是 MyBatis 3.x 對映器基礎結構的Java介面（使用註解），無XML檔案。

習慣使用XMLMAPPER，配置如下：

<!--JavaDao層介面(XxxxDao.java)生成配置 targetProject+targetPackage構成全路徑-->
<javaClientGenerator targetPackage="pers.hanchao.myssm.test.generator.dao" targetProject="src\main\java" type="XMLMAPPER">
    <!--是否允許建立子包（對應MySql的scheme）-->
    <property name="enableSubPackages" value="true"/>
</javaClientGenerator>

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