SpringBoot启动问题

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1、初次使用SpringBoot的同学们可能运行时会碰到java.lang.NoSuchMethodError: javax.servlet.ServletContext.getVirtualServerName()Ljava/lang/String异常的信息，此时可能是你tomcat版本冲突导致。

我本地的Tomcat版本是7，Springboot内置版本是8

java.lang.NoSuchMethodError: javax.servlet.ServletContext.getVirtualServerName()Ljava/lang/String;at org.apache.tomcat.websocket.server.WsServerContainer.<init>(WsServerContainer.java:149) ~[tomcat-embed-websocket-8.0.33.jar:8.0.33]at org.apache.tomcat.websocket.server.WsSci.init(WsSci.java:131) ~[tomcat-embed-websocket-8.0.33.jar:8.0.33]at org.apache.tomcat.websocket.server.WsContextListener.contextInitialized(WsContextListener.java:39) ~[tomcat-embed-websocket-8.0.33.jar:8.0.33]at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4811) [tomcat-embed-core-8.0.33.jar:8.0.33]at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5251) [tomcat-embed-core-8.0.33.jar:8.0.33]at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) [tomcat-embed-core-8.0.33.jar:8.0.33]at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408) [tomcat-embed-core-8.0.33.jar:8.0.33]at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398) [tomcat-embed-core-8.0.33.jar:8.0.33]at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_79]at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_79]at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_79]at java.lang.Thread.run(Thread.java:745) [na:1.7.0_79]

SpringBoot所依赖的jar包和你本地的tomcat版本不一致导致，Spring运行首先会匹配本地的tomcat，需要和本地tomcat版本保持一致，如果时maven管理则需要将pom.xml中加入

<properties>  <tomcat.version>7.0.52</tomcat.version></properties>
重新启动，问题可以解决

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