【发布时间】：2018-01-05 14:47:21
【问题描述】：
我的任务是将网站从一个机构迁移到另一个机构。作为该过程的一部分，我们正在尝试更新站点使用的版本。
最初我被要求将 Java 8 与 Tomcat 5.5（在 Linux 上）一起使用，这导致了一些问题。从那以后，我尝试使用 Java 8 将 webapps 部署到 Tomcat 9。一些 webapps 似乎运行良好（并解决了我在使用 Tomcat5 时遇到的问题）。但是，当我转到 index.jsp 时，主应用程序会引发 JasperException - 部署到 Tomcat 5.5 的相同 Web 应用程序加载没有问题。
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: [15] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
The type index_jsp must implement the inherited abstract method JspSourceImports.getPackageImports()
An error occurred at line: [15] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
The type index_jsp must implement the inherited abstract method JspSourceImports.getClassImports()
An error occurred at line: [15] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
The type index_jsp must implement the inherited abstract method JspSourceDependent.getDependants()
An error occurred at line: [22] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
The type Map is not generic; it cannot be parameterized with arguments <String, Long>
An error occurred at line: [24] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
The type Set is not generic; it cannot be parameterized with arguments <String>
An error occurred at line: [26] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
The type Set is not generic; it cannot be parameterized with arguments <String>
An error occurred at line: [29] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
_jspx_imports_packages cannot be resolved to a variable
An error occurred at line: [29] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
The type HashSet is not generic; it cannot be parameterized with arguments <>
An error occurred at line: [30] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
_jspx_imports_packages cannot be resolved
An error occurred at line: [31] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
_jspx_imports_packages cannot be resolved
An error occurred at line: [32] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
_jspx_imports_packages cannot be resolved
An error occurred at line: [33] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
_jspx_imports_classes cannot be resolved to a variable
An error occurred at line: [39] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
The type Map is not generic; it cannot be parameterized with arguments <String, Long>
An error occurred at line: [40] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
_jspx_dependants cannot be resolved to a variable
An error occurred at line: [43] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
The type Set is not generic; it cannot be parameterized with arguments <String>
An error occurred at line: [44] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
_jspx_imports_packages cannot be resolved to a variable
An error occurred at line: [47] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
The type Set is not generic; it cannot be parameterized with arguments <String>
An error occurred at line: [48] in the generated java file: [/opt/tomcat9/work/Catalina/localhost/home/org/apache/jsp/index_jsp.java]
_jspx_imports_classes cannot be resolved to a variable
Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:103)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:213)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:458)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:389)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:361)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:345)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:603)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
edu.purdue.cybercenter.ionomics.servlet.PiiMS.doGet(PiiMS.java:83)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
我发现的大多数类似问题都表明这与 jar 文件有关，并且可能与某种冲突有关。但是，tomcat 9 的 lib 结构与 tomcat5 不同，我不确定哪些 jar 可能会导致这种情况。我还尝试将 index.jsp 更改为更简单的 (HelloWorld) 形式 - 删除任何代码，并引发相同的异常。
有没有人遇到过类似的问题和/或有什么建议？
谢谢。
【问题讨论】：
-
您是否将 Tomcat 5 时代安装中的任何“生成”文件复制到 Tomcat 8/8/5/9 安装中？具体来说，从您的
.jsp文件构建的任何 .java 文件？这些生成的文件不能在 Tomcat 版本之间移植（有时甚至是同一版本中的点发布）。如果停止 Tomcat，完全删除work目录并重新启动 Tomcat，是否可以解决任何问题？ -
不应再将任何东西部署到 Tomcat 5 上。 Tomcat 7 是当今任何人都可以使用的最低合理版本。如果可能的话，Tomcat 8.5 将是最好的选择。
-
感谢克里斯托弗的关注和提示。我没有在tomcat5和tomcat9之间复制任何文件。我也试过删除工作目录并重新启动没有解决问题的tomcat
-
抱歉，您遇到了问题。由于这可能是一个旷日持久的调查/讨论，我是否可以建议您加入Tomcat users' mailing 列表并在那里重新发布您的问题？ SO 可能不是您在这种情况下获得帮助的正确论坛。