zoukankan      html  css  js  c++  java
  • servlet常见错误1

    后端JAVA程序报错:

    java.lang.ClassCastException: DB.GetPerson cannot be cast to javax.servlet.Servlet
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1144)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:865)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:136)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

    错误原因有可能是以下几种原因:

    (1)后端的JAVA类声明的时候忘记extends HttpServlet

    (2)Web.xml配置文件发生错误,往往是路径没有配置好

  • 相关阅读:
    唐-诗:《旅夜书怀》
    唐-诗:《蜀相》
    唐-诗:《绝句四首》
    唐-诗:《望庐山瀑布》
    唐-诗-七言绝句:《黄鹤楼送孟浩然之广陵》
    汉-诗歌:《大风歌》
    makefile中的一点知识
    我们该不该“越级汇报”
    SDUT--找朋友(BFS&&DFS)
    智能社区--HI3516C可视门禁研发出来咯
  • 原文地址:https://www.cnblogs.com/codeDog123/p/6485983.html
Copyright © 2011-2022 走看看