dubbo项目启动报错，无法加载org.apache.zookeeper.server.ZooTrace

INFO: Server startup in 3425 ms
七月 11, 2017 3:06:04 下午 org.apache.catalina.loader.WebappClassLoaderBase loadClass
INFO: Illegal access: this web application instance has been stopped already.  Could not load org.apache.zookeeper.server.ZooTrace.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1777)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1155)