servlet 调用java类时报错，jar包都导入了！

[qq_36528060]

HTTP Status 500 - Servlet execution threw an exception


type Exception report

message Servlet execution threw an exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception
javax.servlet.ServletException: Servlet execution threw an exception
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)



root cause
java.lang.NoClassDefFoundError: javax/mail/Message
com.ningmeng.web.LoginServlet.doPost(LoginServlet.java:43)
javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)



root cause
java.lang.ClassNotFoundException: javax.mail.Message
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
com.ningmeng.web.LoginServlet.doPost(LoginServlet.java:43)
javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)



note The full stack trace of the root cause is available in the Apache Tomcat/7.0.82 logs.

[xy825459556]

[望崖]

是不是发邮件。

[望崖]

一般，清理缓存(clean)重启服务器重新发布项目，即可。

[qq_36528060]

怎么clean

[qq_36528060]

解决了，把mail.java放到Dao包下就行了