java邮件开发出现java.lang.ClassCastException: javax.mail.Session cannot be cast to j错误

[sally-wang]

java.lang.ClassCastException: javax.mail.Session cannot be cast to javax.mail.Session at cn.itcast.javamail3.web.mail.servlets.SendMailServlet.doPost(SendMailServlet.java:56) at cn.itcast.javamail3.web.mail.servlets.SendMailServlet.doGet(SendMailServlet.java:35) at javax.servlet.http.HttpServlet.service(HttpServlet.java:690) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619)

[keyboardsun]

你的类转换错误啊，你可能引用错包了，
楼主应该把错误的代码贴出来。

你这样贴异常，如果在javaeye网站，就被删贴了。

[紫炎圣骑]

这个异常看起来好累呀

为什么不是顺序的打印？

很明显的类转换异常呀，检查引用的类是否正确。