详细报错：

首先不要慌张，这不是Tomcat引发的问题。而是你自己代码错误导致的问题（小编遇到的是配置servlet-mapping时，url-pattern中配置不合法）

然后，检查控制台打印信息，寻找caused by部分。

果然，小编找到一条：

Caused by: org.apache.catalina.LifecycleException: A child container failed during start

以及：

严重: A child container failed during start

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: A child container failed during start

似乎，找到了错误，但是很遗憾，这也不是错误产生的原因。

提示：A child container failed during start 从来都不是问题的根本原因！

继续向上寻找。

小编的错误找到了：

Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> doLogin in servlet mapping

最终原因是，在配置<url-pattern>标签是在doLogin前面少写了一个反斜杠。

参考博客：http://blog.csdn.net/testcs_dn/article/details/41824497

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