以下内如来自：https://www.cnblogs.com/naiyou/p/7253576.html
Tomcat启动失败：java.lang.NoSuchMethodError: org.apache.tomcat.util.res.StringManager.getManager(Ljava/lang/Class;)Lorg/apache/tomcat/util/res/StringManager
项目开发中发现服务器上Tomcat启动失败
开始定位
第一步：打开tomcat日志catalina.log:
2017-07-25 17:02:43,799 [Catalina-startStop-1] ERROR org.apache.catalina.core.ContainerBase - A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/yxicadmin]]
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:188)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1122)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1574)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1564)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/yxicadmin]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
... 6 more
Caused by: java.lang.NoSuchMethodError: org.apache.tomcat.util.res.StringManager.getManager(Ljava/lang/Class;)Lorg/apache/tomcat/util/res/StringManager;
at org.apache.tomcat.websocket.WsWebSocketContainer.<clinit>(WsWebSocketContainer.java:77)
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:5506)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 6 more
2017-07-25 17:02:43,802 [main] ERROR org.apache.catalina.core.ContainerBase - A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:188)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1122)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:300)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:739)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.startup.Catalina.start(Catalina.java:689)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)找到关键点：java.lang.NoSuchMethodError: org.apache.tomcat.util.res.StringManager.getManager(Ljava/lang/Class;)Lorg/apache/tomcat/util/res/StringManager;
虽然不清楚是什么原因，不过很奇怪的是本地项目是能跑起来的。看了下测试机tomcat版本是7.0.56，本地是7.0.68，难道和这个有关？
第二步：判断是否和tomcat版本有关：
下载了一个7.0.56版本的tomcat，在本地运行，果不其然，也复现了该错误。然而是不是和tomcat有关呢？这个不不能确定，但是有一点是可以肯定的，测试机tomcat版本替换难度较大，而且还要所有环境版本同步，这个代价较大，因此转换思路，是否是类冲突了呢。。
开始百度
第三步：发现关键原因：类冲突
网上查找类似错误，有前辈遇到了，并且分析了原因：Springboot内嵌tomcat8，与tomcat7冲突,突然意识到这个需求引入了部门其他同事提供的Jar包，难道是那个Jar包导致的。。
OK,那我们验证下，先使用maven命令：mvn dependency:tree 输出下maven依赖树：
发现关键点：
[INFO] +- com.xxx.xxx.xx:xxx-client:jar:1.0-SNAPSHOT:compile
[INFO] | +- com.netease.mail.dp:dqs-model:jar:1.0-SNAPSHOT:compile
[INFO] | +- org.apache.commons:commons-lang3:jar:3.4:compile
[INFO] | +- commons-httpclient:commons-httpclient:jar:3.1:compile
[INFO] | +- org.springframework.boot:spring-boot-starter-web:jar:1.5.1.RELEASE:compile
[INFO] | | \- org.springframework.boot:spring-boot-starter:jar:1.5.1.RELEASE:compile
[INFO] | | +- org.springframework.boot:spring-boot:jar:1.5.1.RELEASE:compile
[INFO] | | +- org.springframework.boot:spring-boot-autoconfigure:jar:1.5.1.RELEASE:compile
[INFO] | | \- org.springframework.boot:spring-boot-starter-logging:jar:1.5.1.RELEASE:compile果然，这个XXXJar包引用了org.springframework.boot:spring-boot-starter-web
试着使用网上的办法去掉spring-boot-starter-web依赖的spring-boot-starter-tomcat Jar包，没用
于是直接粗暴点：
<dependency>
<groupId>com.xxx.xxx.xxx</groupId>
<artifactId>xxx-client</artifactId>
<version>1.0-SNAPSHOT</version>
<exclusions>
<exclusion>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-el</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-websocket</artifactId>
</exclusion>
</exclusions>
</dependency>重新打包运行，问题解决。