问题描述
这是我尝试运行 JSP 文件时在浏览器屏幕上看到的内容.
This is what I got on the browser screen when I try to run the JSP file.
未定义 JspFactory 类型的 getJspApplicationContext(ServletContext) 方法
堆栈跟踪:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439)org.apache.jasper.compiler.Compiler.compile(Compiler.java:334)org.apache.jasper.compiler.Compiler.compile(Compiler.java:312)org.apache.jasper.compiler.Compiler.compile(Compiler.java:299)org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
我运行Tomcat窗口时抛出了jasper异常.
And the jasper exception is thrown on the Tomcat window when I ran it.
推荐答案
那个方法 是在 JSP 2.1 中引入的.此问题有 3 个原因:
That method was introduced in JSP 2.1. There are 3 causes for this problem:
您使用的 JSP 容器版本太旧(例如，您至少需要 Tomcat 6.0).
您在 web.xml 中声明了错误的 Servlet 版本.JSP 2.1 与 Servlet 2.5 齐头并进，因此您的 web.xml 至少应按照 Servlet 2.5 规范进行声明(为此您仍然需要一个支持 Servlet 2.5/JSP 2.1 的 servletcontainer).
You've declared the wrong Servlet version in web.xml. JSP 2.1 goes hand in hand with Servlet 2.5, so your web.xml should at least be declared as per the Servlet 2.5 spec (you still need a Servlet 2.5 / JSP 2.1 capable servletcontainer for that).
您已将旧版本的特定于应用程序服务器的库复制到 web 应用程序的 /WEB-INF/lib 中，例如 servlet-api.jar、jsp-api.jar 等.你不应该永远这样做.它只会导致类加载冲突.在您的 web 项目中删除它们，并在应用服务器中保留/不接触它们.
You've duplicated older versioned appserver-specific libraries into webapp's /WEB-INF/lib, like servlet-api.jar, jsp-api.jar and so on. You should never do that. It will only result in classloading collisions. Get rid of them in your webproject and leave/untouch them there in the appserver.
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