今天下载mybatis plugin插件的时候

有好多个版本的plugin，然后呢，看第二个比较热门，就下载了第二个，然后重启idea发现这个插件貌似得花钱，那算了吧，咱用第一个免费的吧，就又下载了第一个，然后重启idea。然后。。。就炸了。

瞬间感觉心慌慌的，最后还是借助百度解决了。。

首先看上面那个报错信息，一看就很像jar包冲突的报错信息，先放着，我们再看看idea的日志：C:\Users\{username}\.IntelliJIdea2016.1\system\log\idea.log。在这个路径下，打开idea.log。找到刚刚的报错信息：

2017-07-11 17:22:48,947 [  22053]   INFO - ellij.project.impl.ProjectImpl - 23 project components initialized in 74 ms

2017-07-11 17:22:48,947 [  22053]   INFO - le.impl.ModuleManagerComponent - 0 module(s) loaded in 0 ms

2017-07-11 17:23:07,331 [  40437]   INFO - roject.impl.ProjectManagerImpl - com.intellij.diagnostic.PluginException: com.seventh7.mybatis.setting.MybatisSetting cannot be cast to com.seventh7.mybatis.setting.MybatisSetting [Plugin: com.seventh7.plugin.mybatis]

com.intellij.ide.plugins.PluginManager$StartupAbortedException: com.intellij.diagnostic.PluginException: com.seventh7.mybatis.setting.MybatisSetting cannot be cast to com.seventh7.mybatis.setting.MybatisSetting [Plugin: com.seventh7.plugin.mybatis]

	at com.intellij.ide.plugins.PluginManager.handleComponentError(PluginManager.java:249)

	at com.intellij.openapi.components.impl.PlatformComponentManagerImpl.handleInitComponentError(PlatformComponentManagerImpl.java:43)

	at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:519)

	at com.intellij.openapi.components.impl.ComponentManagerImpl.createComponents(ComponentManagerImpl.java:125)

	at com.intellij.openapi.components.impl.ComponentManagerImpl.init(ComponentManagerImpl.java:109)

	at com.intellij.openapi.components.impl.ComponentManagerImpl.init(ComponentManagerImpl.java:96)

	at com.intellij.openapi.project.impl.ProjectImpl.init(ProjectImpl.java:287)

	at com.intellij.openapi.project.impl.ProjectManagerImpl.a(ProjectManagerImpl.java:222)

	at com.intellij.openapi.project.impl.ProjectManagerImpl.d(ProjectManagerImpl.java:459)

	at com.intellij.openapi.project.impl.ProjectManagerImpl.access$100(ProjectManagerImpl.java:60)

	at com.intellij.openapi.project.impl.ProjectManagerImpl$2.compute(ProjectManagerImpl.java:406)

	at com.intellij.openapi.project.impl.ProjectManagerImpl$2.compute(ProjectManagerImpl.java:403)

	at com.intellij.openapi.progress.Task$WithResult.run(Task.java:307)

	at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:710)

	at com.intellij.openapi.progress.impl.CoreProgressManager$11.run(CoreProgressManager.java:423)

	at com.intellij.openapi.progress.impl.CoreProgressManager$3.run(CoreProgressManager.java:179)

	at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:568)

	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:519)

	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)

	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:164)

	at com.intellij.openapi.application.impl.ApplicationImpl.a(ApplicationImpl.java:572)

	at com.intellij.openapi.application.impl.ApplicationImpl$2.run(ApplicationImpl.java:309)

	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

	at java.util.concurrent.FutureTask.run(FutureTask.java:266)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

	at java.lang.Thread.run(Thread.java:745)

Caused by: com.intellij.diagnostic.PluginException: com.seventh7.mybatis.setting.MybatisSetting cannot be cast to com.seventh7.mybatis.setting.MybatisSetting [Plugin: com.seventh7.plugin.mybatis]

	... 27 more

Caused by: java.lang.ClassCastException: com.seventh7.mybatis.setting.MybatisSetting cannot be cast to com.seventh7.mybatis.setting.MybatisSetting

	at com.seventh7.mybatis.setting.MybatisSetting.getInstance(MybatisSetting.java:56)

	at com.seventh7.mybatis.ref.CmProject.initComponent(CmProject.java:59)

	at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:501)

	... 24 more

最后一段看似和idea启动的时候那个报错差不多。应该是jar包冲突了，但是jar包叫什么名字，在什么地方呢，这是个问题，windows的文件搜索很难找。

于是，下载了一个Everything （该工具可以实现秒查电脑上任意位置的任意文件，堪称本地文件搜索神器，下载地址:http://www.voidtools.com/）。随意的搜了下mybatis，然后按时间排个序，看似找到了。

应该是这两个jar冲突了，删掉那个收费的试试。然后重启idea。完美解决~