工程启动报错cannot be cast to javax.servlet.Servlet

Question

错误：
严重: Servlet [SendMailServlet] in web application [/SendMail] threw load() exception
java.lang.ClassCastException: com.rl.mail.SendMailTask cannot be cast to javax.servlet.Servlet
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1050)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:989)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4913)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5223)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

代码是网上的，内容比较多，下面是地址
地址：https://blog.csdn.net/suyu_yuan/article/details/50668236

Answer 1

包冲突造成的 https://blog.csdn.net/qqqqq210/article/details/52012300