Tomcat启动失败：java.lang.NoSuchMethodError: org.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 ERROR org.apache.catalina.core.ContainerBase - A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component .StandardHost.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 .StandardHost.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 ERROR org.apache.catalina.core.ContainerBase - A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component .StandardHost]
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：
+- com.xxx.xxx.xx:xxx-client:jar:1.0-SNAPSHOT:compile
|+- com.netease.mail.dp:dqs-model:jar:1.0-SNAPSHOT:compile
|+- org.apache.commons:commons-lang3:jar:3.4:compile
|+- commons-httpclient:commons-httpclient:jar:3.1:compile
|+- org.springframework.boot:spring-boot-starter-web:jar:1.5.1.RELEASE:compile
||\- org.springframework.boot:spring-boot-starter:jar:1.5.1.RELEASE:compile
|| +- org.springframework.boot:spring-boot:jar:1.5.1.RELEASE:compile
|| +- org.springframework.boot:spring-boot-autoconfigure:jar:1.5.1.RELEASE:compile
|| \- 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。
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