[ERROR] Failed to execute goal org.mortbay.jetty:maven-jetty-plugin:6.1.26:run (default-cli) on project simple-webapp: Failure: Address already in use -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] [INFO] Shutdown hook executing [INFO] Stopped :8080 [WARNING] failed jsp: java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspApplicationContextImpl [WARNING] failed ServletHandler@6432d3c0: java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspApplicationContextImpl [WARNING] failed SecurityHandler@44ec15a4: java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspApplicationContextImpl [WARNING] failed SessionHandler@6780e555: java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspApplicationContextImpl [WARNING] failed org.mortbay.jetty.plugin.Jetty6PluginWebAppContext@46eda3d8{/simple-webapp,/home/mwl/demo/mvnexbook-examples-1.0/ch-simple-web/simple-webapp/src/main/webapp}: java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspApplicationContextImpl [WARNING] failed ContextHandlerCollection@3f506489: java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspApplicationContextImpl [WARNING] failed HandlerCollection@36f87ed8: java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspApplicationContextImpl [WARNING] failed Server@54329d2f: java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspApplicationContextImpl Exception in thread "Shutdown" java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspApplicationContextImpl at org.apache.jasper.servlet.JspServlet.destroy(JspServlet.java:411) at org.mortbay.jetty.servlet.ServletHolder.destroyInstance(ServletHolder.java:318) at org.mortbay.jetty.servlet.ServletHolder.doStop(ServletHolder.java:289) at org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:76) at org.mortbay.jetty.servlet.ServletHandler.doStop(ServletHandler.java:185) at org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:76) at org.mortbay.jetty.handler.HandlerWrapper.doStop(HandlerWrapper.java:142) at org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:76) at org.mortbay.jetty.handler.HandlerWrapper.doStop(HandlerWrapper.java:142) at org.mortbay.jetty.servlet.SessionHandler.doStop(SessionHandler.java:125) at org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:76) at org.mortbay.jetty.handler.HandlerWrapper.doStop(HandlerWrapper.java:142) at org.mortbay.jetty.handler.ContextHandler.doStop(ContextHandler.java:592) at org.mortbay.jetty.webapp.WebAppContext.doStop(WebAppContext.java:537) at org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStop(Jetty6PluginWebAppContext.java:123) at org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:76) at org.mortbay.jetty.handler.HandlerCollection.doStop(HandlerCollection.java:169) at org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:76) at org.mortbay.jetty.handler.HandlerCollection.doStop(HandlerCollection.java:169) at org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:76) at org.mortbay.jetty.handler.HandlerWrapper.doStop(HandlerWrapper.java:142) at org.mortbay.jetty.Server.doStop(Server.java:283) at org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:76) at org.mortbay.jetty.Server$ShutdownHookThread.run(Server.java:561) Caused by: java.lang.ClassNotFoundException: org.apache.jasper.runtime.JspApplicationContextImpl at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50) at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244) at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230) ... 24 more

解决：8080端口被占用，kill掉java（一般是tomcat）