PowerMock测试Zookeeper异常(ClassCastException: class sun.security.provider.ConfigFile)-优快云博客

本文链接：https://blog.youkuaiyun.com/fly_leopard/article/details/83183427

本文介绍在使用PowerMock测试Zookeeper时遇到的ClassCastException异常及其解决方案。通过添加@PowerMockIgnore注解，告知PowerMock某些类需由系统类加载器加载，避免自定义类加载器引起的错误。

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15:19:39.711 14531 [main-SendThread(10.x.x.x:2181)] WARN o.a.zookeeper.ClientCnxn -  Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.lang.ClassCastException: class sun.security.provider.ConfigFile
	at java.lang.Class.asSubclass(Class.java:3404)
	at javax.security.auth.login.Configuration$2.run(Configuration.java:254)
	at javax.security.auth.login.Configuration$2.run(Configuration.java:247)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.login.Configuration.getConfiguration(Configuration.java:246)
	at org.apache.zookeeper.client.ZooKeeperSaslClient.<init>(ZooKeeperSaslClient.java:119)
	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:949)
	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1003)

上面的问题是在使用PowerMock测试Zookeeper时候抛出的异常，解决方式是在测试类上添加注解@PowerMockIgnore，由于Mock使用的是自定义类加载器以达到修改字节码的目的，但是对于需要系统类加载器加载却用了Mock的类加载器加载的则会出现ClassCastException异常，需要使用注解告诉PowerMock，哪些类需要让系统类加载器加载。

PowerMockIgnore({"javax.security.*"})

常用的还有

@PowerMockIgnore({"javax.net.ssl.*","javax.management.*", "javax.security.*", "javax.crypto.*"})