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之前用mybatis-generator生成工具都好好的，突然就不好用了。报错如下：
警告: Error injecting: org.mybatis.generator.maven.MyBatisGeneratorMojo
java.lang.NoClassDefFoundError: org/mybatis/generator/exception/InvalidConfigurationException
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2493)
at java.lang.Class.getDeclaredConstructors(Class.java:1901)
at com.google.inject.spi.InjectionPoint.forConstructorOf(InjectionPoint.java:245)
at com.google.inject.internal.ConstructorBindingImpl.create(ConstructorBindingImpl.java:98)
at com.google.inject.internal.InjectorImpl.createUninitializedBinding(InjectorImpl.java:629)
at com.google.inject.internal.InjectorImpl.createJustInTimeBinding(InjectorImpl.java:831)
at com.google.inject.internal.InjectorImpl.createJustInTimeBindingRecursive(InjectorImpl.java:758)
at com.google.inject.internal.InjectorImpl.getJustInTimeBinding(InjectorImpl.java:255)
at com.google.inject.internal.InjectorImpl.getBindingOrThrow(InjectorImpl.java:204)
at com.google.inject.internal.InjectorImpl.getProviderOrThrow(InjectorImpl.java:954)
at com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:987)
at com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:950)
at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1000)
at org.sonatype.guice.bean.reflect.AbstractDeferredClass.get(AbstractDeferredClass.java:45)
at com.google.inject.internal.ProviderInternalFactory.provision(ProviderInternalFactory.java:84)
at com.google.inject.internal.InternalFactoryToInitializableAdapter.provision(InternalFactoryToInitializableAdapter.java:52)
at com.google.inject.internal.ProviderInternalFactory$1.call(ProviderInternalFactory.java:70)
at com.google.inject.internal.ProvisionListenerStackCallback$Provision.provision(ProvisionListenerStackCallback.java:100)
at org.sonatype.guice.plexus.lifecycles.PlexusLifecycleManager.onProvision(PlexusLifecycleManager.java:138)
at com.google.inject.internal.ProvisionListenerStackCallback$Provision.provision(ProvisionListenerStackCallback.java:108)
at com.google.inject.internal.ProvisionListenerStackCallback.provision(ProvisionListenerStackCallback.java:55)
at com.google.inject.internal.ProviderInternalFactory.circularGet(ProviderInternalFactory.java:68)
at com.google.inject.internal.InternalFactoryToInitializableAdapter.get(InternalFactoryToInitializableAdapter.java:45)
at com.google.inject.internal.InjectorImpl$3$1.call(InjectorImpl.java:965)
at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1011)
at com.google.inject.internal.InjectorImpl$3.get(InjectorImpl.java:961)
at com.google.inject.Scopes$1$1.get(Scopes.java:59)
at org.sonatype.guice.bean.locators.LazyBeanEntry.getValue(LazyBeanEntry.java:83)
at org.sonatype.guice.plexus.locators.LazyPlexusBean.getValue(LazyPlexusBean.java:49)
at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:253)
at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:245)
at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getConfiguredMojo(DefaultMavenPluginManager.java:455)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:92)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
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:84)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: java.lang.ClassNotFoundException: org.mybatis.generator.exception.InvalidConfigurationException
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230)
... 60 more
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.470s
[INFO] Finished at: Sun Mar 06 13:19:18 CST 2016
[INFO] Final Memory: 7M/154M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate (default-cli) on project coocaa: Execution default-cli of goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate failed: A required class was
missing while executing org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate: org/mybatis/generator/exception/InvalidConfigurationException
[ERROR] -----------------------------------------------------
[ERROR] realm = plugin>org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/D:/Program%20Files%20(x86)/maven3.0.5/repository/org/mybatis/generator/mybatis-generator-maven-plugin/1.3.2/mybatis-generator-maven-plugin-1.3.2.jar
[ERROR] urls[1] = file:/D:/Program%20Files%20(x86)/maven3.0.5/repository/org/codehaus/plexus/plexus-utils/1.1/plexus-utils-1.1.jar
[ERROR] Number of foreign imports: 1
[ERROR] import: Entry[import from realm ClassRealm[maven.api, parent: null]]
[ERROR]
[ERROR] -----------------------------------------------------: org.mybatis.generator.exception.InvalidConfigurationException
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1]http://cwiki.apache.org/confluence/display/MAVEN/PluginContainerException
Process finished with exit code 1
在网上查了很多资料都没办法解决，突然看到一篇类似的文章http://my.oschina.net/u/2329222/blog/412421说是要把org/mybatis/generator下面的jar包删除，然后运行maven重新生成。
照做了一下，还是报这个错。但是因为重新生成了一下才让我发现了其中的问题，下载jar包的地址是我之前配置的私服地址，找不到java.lang.NoClassDefFoundError: org/mybatis/generator/exception/InvalidConfigurationException这个类，是因为私服上的jar包里面没有，所以我找到maven中setting.xml配置文件，注释掉私服配置的那一段，然后删除org/mybatis/generator下面的jar包，再用maven重新下载，这个时候就是在maven中央仓库中下载的jar包。这个时候再使用mybatis-generator就没问题了。
mavengeneratormybatis

因为水平有限，难免有疏忽或者不准确的地方，希望大家能够直接指出来，我会及时改正。一切为了知识的分享。

后续会有更多的精彩的内容分享给大家。