问题
After installing Android Studio on a new Win8.1x64 machine, whenever I try to launch it I get a ClassNotFoundException: com.intellij.ide.plugins.PluginManager and Studio does not start. I have tried unzipping instead of installing, restarting the computer several times, cleaning all Android Studio related settings and files, still no result.
I have installed the latest JDK and the SDK. JAVA_HOME variable is set as well. Any idea what is going on? It's driving me nuts already. I would appreciate any help!
Here are the three different errors that randomly come up when I try to launch Android Studio.
java.lang.ClassNotFoundException: com.intellij.ide.plugins.PluginManager
at com.intellij.util.lang.UrlClassLoader.findClass(UrlClassLoader.java:148)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.intellij.ide.Bootstrap.main(Bootstrap.java:37)
at com.intellij.idea.Main.main(Main.java:84)
.
java.lang.NoClassDefFoundError: com/intellij/openapi/extensions/LogProvider
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.intellij.ide.Bootstrap.main(Bootstrap.java:37)
at com.intellij.idea.Main.main(Main.java:84)
Caused by: java.lang.ClassNotFoundException: com.intellij.openapi.extensions.LogProvider
at com.intellij.util.lang.UrlClassLoader.findClass(UrlClassLoader.java:148)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 4 more
.
java.lang.NoClassDefFoundError: com/intellij/openapi/extensions/PluginDescriptor
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
at com.intellij.util.lang.UrlClassLoader._defineClass(UrlClassLoader.java:195)
at com.intellij.util.lang.UrlClassLoader.defineClass(UrlClassLoader.java:191)
at com.intellij.util.lang.UrlClassLoader.findClass(UrlClassLoader.java:152)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.intellij.ide.Bootstrap.main(Bootstrap.java:37)
at com.intellij.idea.Main.main(Main.java:84)
Caused by: java.lang.ClassNotFoundException: com.intellij.openapi.extensions.PluginDescriptor
at com.intellij.util.lang.UrlClassLoader.findClass(UrlClassLoader.java:148)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 12 more
回答1:
For anyone who has a similar problem, the errors were caused by antivirus software (in this case Avast). After uninstalling it I was able to normally install and start Android Studio. I'm not sure exactly what is happening between Avast and Android Studio, but this solved the problem.
Also, I installed Avast back and now I get multiple IllegalStateExceptions and NullPointerExceptions in the Android Studio Event Log, but these do not interfere with working in AS normally.
来源：https://stackoverflow.com/questions/29317818/android-studio-start-failed-classnotfoundexception-com-intellij-ide-plugins-p