tomcat eclipse主要没有找到jsp随机类

时间：2014-12-03 12:20:06

标签： java eclipse jsp maven tomcat

我的eclipse，maven，tomcat配置有一个相当奇怪的问题。不知何故，我随机地为我的项目的主jsp（总是被调用并包含每个页面的主体的jsp）获得ClassNotFoundException。 应用程序在测试服务器和实时服务器上正常运行，而不会遇到此问题。 在继续清理项目后，在我的开发系统上，在Tomcat上清理并清理Tomcat工作目录，它有时会再次运行。但是大部分时间我都要做几次这个程序（10到20次）直到它再次开始工作。经过一些小的改动，它再次停止工作，我必须再次清洁和清洁10到20次，直到它再次开始工作。这真的很烦人，我现在真的知道如何解决这个问题。

例外：

    org.apache.jasper.JasperException: java.lang.ClassNotFoundException: org.apache.jsp.frame_jsp
    at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:177)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at com.framepool.web.filters.RequestFilter.doFilter(RequestFilter.java:177)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at com.framepool.web.filters.RequestAttributesFilter.doFilter(RequestAttributesFilter.java:146)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:486)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338)
    at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1054)
    at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:384)
    at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)
    at com.framepool.web.VideoRequestProcessor.process(VideoRequestProcessor.java:64)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1858)
    at com.framepool.web.ValidableActionServlet.doGet(ValidableActionServlet.java:59)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at com.framepool.web.filters.RequestFilter.doFilter(RequestFilter.java:177)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at com.framepool.web.filters.RequestAttributesFilter.doFilter(RequestAttributesFilter.java:146)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:486)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338)
    at com.framepool.web.filters.rest.LanguageFilter.doFilter(LanguageFilter.java:79)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at com.framepool.web.filters.DomainRedirectFilter.doFilter(DomainRedirectFilter.java:86)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at com.framepool.web.filters.XSSFilter.doFilter(XSSFilter.java:39)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

    Caused by: java.lang.ClassNotFoundException: org.apache.jsp.frame_jsp
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:132)
    at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:145)
    at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:172)
    ... 66 more

2 个答案:

答案 0 :(得分：2)

解决方案是完全删除eclipse / tomcat scratch dir。搜索.class文件需要很长时间，并且不会给出任何结果。 scratch目录可以在/.metadata/.plugins/org.eclipse.wst.server.core中找到，你可以找到一个名为tmp0的文件夹。删除此文件夹解决了我的问题。

答案 1 :(得分：0)

从基础开始。 ClassNotFoundException的唯一两个原因是该类不存在，或者运行时的配置不包含指向类所在位置的正确指针。

找出您的开发系统期望您的项目的类文件的位置。熟悉eclipse的人可以准确地告诉你这个配置的位置，或者它可以配置的各个地方，我无法摆脱困境。根据您运行Tomcat的方式，它可能不是日食;例如，将Tomcat作为单独的程序运行会将其与eclipse配置分离。

另一种可行的方法是，当它正常工作时，在整个磁盘中搜索显示缺失的类的.class文件（或其中一个，你不清楚它是否总是同一个文件）。它可能有多个副本，请注意它们。下次它不工作时，执行相同的搜索。

我假设您没有将类文件打包到开发环境中的jar中。如果是这样，那么这两个搜索应该告诉你类文件应该在哪里但不是。也许你可以从那里向后工作，找出为什么它似乎是随机的，哪个过程应该把它放在那里，但不是。

我不认为它实际上是随机的，我不会认为它是日食。我认为在你清理10-20次之后，重新启动不同的东西。我希望您也验证过，您没有耗尽磁盘空间或忽略指示编译问题的日志。

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