IDEA跑Spring boot項目正常,打包war以後放tomcat異常

翻了很多帖子,弄了很多版本,其實錯誤不在於異常,而在於警告

警告: Unknown version string [4.0]. Default version will be used.

說白了就是版本不符,項目中Spring boot版本號是

        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>

會使用加載tomcat 9

而我使用的tomcat 7和tomcat 8.所以就會報錯
解放方案 安裝換個tomcat 9就好了,
或者給當前的Spring boot項目的降級

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因爲我的項目需要打包放到服務器上,服務器上tomcat版本不可能隨便換的,所以接下來琢磨如何降級.
™的 不好降…繼續填坑去了

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另外在搜索過程中也有一個帖子評論說很管用,但是沒解決我的問題,我帶個傳送門吧
org.apache.catalina.LifecycleException: Failed to start component tandardEngine Catalina.Standard

最後附上異常

五月 22, 2019 9:52:57 下午 org.apache.catalina.deploy.WebXml setVersion
警告: Unknown version string [4.0]. Default version will be used.
五月 22, 2019 9:52:57 下午 org.apache.catalina.deploy.WebXml setVersion
警告: Unknown version string [4.0]. Default version will be used.
五月 22, 2019 9:53:02 下午 org.apache.catalina.startup.TaglibUriRule body
信息: TLD skipped. URI: http://www.springframework.org/tags is already defined
五月 22, 2019 9:53:02 下午 org.apache.catalina.startup.TaglibUriRule body
信息: TLD skipped. URI: http://www.springframework.org/tags/form is already defined
五月 22, 2019 9:53:02 下午 org.apache.catalina.startup.TldConfig execute
信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
五月 22, 2019 9:53:02 下午 org.apache.catalina.core.ContainerBase addChildInternal
嚴重: ContainerBase.addChild: start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/wristband]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1017)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:993)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1127)
	at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:2021)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NoClassDefFoundError: javax/servlet/GenericFilter
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:3222)
	at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:1409)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1897)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1771)
	at org.apache.tomcat.websocket.server.WsServerContainer.<init>(WsServerContainer.java:109)
	at org.apache.tomcat.websocket.server.WsSci.init(WsSci.java:131)
	at org.apache.tomcat.websocket.server.WsSci.onStartup(WsSci.java:47)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5669)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	... 10 more
Caused by: java.lang.ClassNotFoundException: javax.servlet.GenericFilter
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1928)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1771)
	... 22 more

五月 22, 2019 9:53:02 下午 org.apache.catalina.startup.HostConfig deployWAR
嚴重: Error deploying web application archive D:\apache-tomcat-7.0.88\webapps\wristband.war
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/wristband]]
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1021)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:993)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1127)
	at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:2021)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

五月 22, 2019 9:53:02 下午 org.apache.catalina.startup.HostConfig deployWAR