java - 类文件使用导入但报告 Unresolved 编译问题

Question

我遇到了导致“ Unresolved 编译问题”错误的问题。我看过this SO question ，以及 this one相同的性质，最后是 this one再次描述相同的错误。

所有这三个都描述了处理编译错误，但是当我编译我的项目的类文件时，无论是使用 Eclipse 内部的 Maven、命令行中的 Maven，还是仅使用 javac 命令，都不会报告任何错误。

我们有一个自定义类 JmxTools，它使用 import org.apache.commons.modeler.Registry;现在源文件不会提示缺少导入。


对类似问题的回答建议查看 eclipse 中的“问题” View 。这显示没有错误



所以，一切都编译得很好，commons-modeler jar 在我的 Maven 依赖项中。然而，当我运行我的网络应用程序并使用 JmxTools 类调用页面时，我收到以下错误堆栈:

    org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.Error: Unresolved compilation problems: 

    The import org.apache.commons.modeler cannot be resolved
    Registry cannot be resolved to a type
    Registry cannot be resolved to a type
    Registry cannot be resolved
    Registry cannot be resolved
    Registry cannot be resolved to a type
    Registry cannot be resolved to a type
    at 

    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:561)
        at 

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:462)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    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.gy.filters.AccessControlFilter.doFilter(AccessControlFilter.java:150)
    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:218)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2549)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2538)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

    Caused by: javax.servlet.ServletException: java.lang.Error: Unresolved compilation problems: 
    The import org.apache.commons.modeler cannot be resolved
    Registry cannot be resolved to a type
    Registry cannot be resolved to a type
    Registry cannot be resolved
    Registry cannot be resolved
    Registry cannot be resolved to a type
    Registry cannot be resolved to a type

    at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:916)
    at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:845)
    at org.apache.jsp.contextlist_jsp._jspService(contextlist_jsp.java:148)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
    ... 26 more

    Caused by: java.lang.Error: Unresolved compilation problems: 
        The import org.apache.commons.modeler cannot be resolved
        Registry cannot be resolved to a type
        Registry cannot be resolved to a type
        Registry cannot be resolved
        Registry cannot be resolved
        Registry cannot be resolved to a type
        Registry cannot be resolved to a type

        at com.gy.admin.JmxTools.<init>(JmxTools.java:18)
        at org.apache.jsp.contextlist_jsp._jspService(contextlist_jsp.java:100)
        ... 29 more

我该如何解决这个问题？这是我以前没有遇到过的事情，类似问题的答案似乎不适用于这种情况

EDIT

遵循卡亚曼的建议:

检查了war文件，commons-modeler jar文件存在于WEB-INF/lib

将 commons-modeler jar 从 war 移动到我的 tomcat 的 lib/文件夹

从命令行

进行了全新的清理，然后编译该包

不幸的是，这些都没有帮助解决这种情况。我仍然收到错误。

Answer 1

我要感谢卡亚曼。我的问题通过在 Eclipse 之外执行大量 maven clean 然后编译然后打包步骤得到解决。

我还必须在 Eclipse 中对 tomcat 进行几次清理和重新发布。

我还完全删除了构建和打包项目的错误依赖项，然后重新添加了依赖项。

我不确定这些步骤中的哪一个解决了我的问题。当它开始工作时，我正在尝试/测试各种解决方案。