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~
