Tomcat Severe: A Child Container Failed During Start

SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]

Solution 1:

A ClassNotFoundException means a required class was not found on the classpath. Therefore, this

Caused by: java.lang.ClassNotFoundException: org.apache.shiro.authc.UnknownAccountException

means that the Java application cannot find the class org.apache.shiro.authc.UnknownAccountException on your classpath.

This class is part of shiro-core which you can get here.