报错信息如下：
[ERROR]Activator initialize error : websocket[ERROR]io/netty/util/concurrent/GenericFutureListenerjava.lang.NoClassDefFoundError: io/netty/util/concurrent/GenericFutureListener at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:264) ……Caused by: java.lang.ClassNotFoundException: io.netty.util.concurrent.GenericFutureListener at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1363) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1186) ... 45 more类找不到，应该是缺少了依赖，这个类对应的依赖可以从中得到它
https://mvnrepository.com/art...
你可以加
<!-- https://mvnrepository.com/artifact/io.netty/netty-all --><dependency> <groupId>io.netty</groupId> <artifactId>netty-all</artifactId> <version>5.0.0.Alpha2</version></dependency>到pom文件或从站点下载jar并将其添加到类路径或lib文件夹