版权声明：copyright@lankk1 https://blog.csdn.net/lankk1/article/details/81206866
1.Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/websocket]]错误
Connected to server
[2018-07-25 05:28:47,397] Artifact websocket:war exploded: Artifact is being deployed, please wait...
七月 25, 2018 5:28:47 下午 org.apache.catalina.loader.WebappClassLoader validateJarFile
信息: validateJarFile(C:\git-learn\websocket\target\websocket\WEB-INF\lib\javaee-api-7.0.jar) - jar not loaded. See Servlet Spec 3.0, section 10.7.2. Offending class: javax/servlet/Servlet.class # 未加载javaee-api-7.0.jar
七月 25, 2018 5:28:47 下午 org.apache.catalina.loader.WebappClassLoader validateJarFile
信息: validateJarFile(C:\git-learn\websocket\target\websocket\WEB-INF\lib\javax.servlet-api-3.1.0.jar) - jar not loaded. See Servlet Spec 3.0, section 10.7.2. Offending class: javax/servlet/Servlet.class # 未加载javax.servlet-api-3.1.0.jar
七月 25, 2018 5:28:49 下午 org.apache.catalina.core.ContainerBase addChildInternal
严重: ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/websocket]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1740)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: The segment [userCode={userCode}] is not valid in the provided path [/webs/userCode={userCode}]
at org.apache.tomcat.websocket.server.UriTemplate.<init>(UriTemplate.java:90)
at org.apache.tomcat.websocket.server.WsServerContainer.addEndpoint(WsServerContainer.java:185)
at org.apache.tomcat.websocket.server.WsServerContainer.addEndpoint(WsServerContainer.java:272)
at org.apache.tomcat.websocket.server.WsSci.onStartup(WsSci.java:143)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5456)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 42 more
解决：
step1：所属pom.xml文件中添加provide，解决未加载两个jar包的问题
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope> # 添加
</dependency>
<dependency>
<!-- 支持websocket -->
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope> # 添加
</dependency>step2：去除错误代码
@ServerEndpoint(value = "/wbs/{userCode}")
//@ServerEndpoint(value = "/webs?userCode={userCode}&userName={userName}"),这行错误代码导致
public class WebsocketUnit {
// vars
private Session session;// 封装了websocket会话
private String userCode;// 访问用户
// websocket请求确立后,会执行onopen注解的function
@OnOpen
public void onOpen(Session session, @PathParam("userCode") String userCode) {
// 连接确定,初始化session和userCode
this.session = session;
this.userCode = userCode;
System.out.println("访问用户userCode=" + userCode);
System.out.println(session.getRequestParameterMap());
}
}