eclipse 方法 getJspApplicationContext(ServletContext) 未定义为 JspFactory 类型

The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory

提问by Hariharbalaji

This is what I got on the browser screen when I try to run the JSP file.

这是我尝试运行 JSP 文件时在浏览器屏幕上看到的内容。

The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory

方法 getJspApplicationContext(ServletContext) 未定义为 JspFactory 类型

Stacktrace:

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)

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.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。编译(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)

And the jasper exception is thrown on the Tomcat window when I ran it.

当我运行它时，在 Tomcat 窗口上抛出了 jasper 异常。

回答by BalusC

The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory

方法 getJspApplicationContext(ServletContext) 未定义为 JspFactory 类型

That methodwas introduced in JSP 2.1. There are 3 causes for this problem:

该方法是在 JSP 2.1 中引入的。这个问题有3个原因：

1. You're using an too old version of the JSP container (you need for example at least Tomcat 6.0).

2. You've declared the wrong Servlet version in web.xml. JSP 2.1 goes hand in hand with Servlet 2.5, so your web.xmlshould 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).

3. You've duplicated older versioned appserver-specific libraries into webapp's /WEB-INF/lib, like servlet-api.jar, jsp-api.jarand so on. You should neverdo that. It will only result in classloading collisions. Get rid of them in your webproject and leave/untouch them there in the appserver.

1. 您使用的 JSP 容器版本太旧（例如，您至少需要Tomcat 6.0）。

2. 您在web.xml. JSP 2.1 与 Servlet 2.5 齐头并进，因此您web.xml至少应该按照 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）。

3. 你复制旧的版本，具体的应用服务器库到Web应用的/WEB-INF/lib，比如servlet-api.jar，jsp-api.jar等等。你永远不应该那样做。它只会导致类加载冲突。在您的 web 项目中摆脱它们，并在应用程序服务器中保留/取消它们。

回答by Ratshi?aho Wayne

<dependency>
   <groupId>javax.servlet</groupId>
   <artifactId>servlet-api</artifactId>
   <version>${servlet.version}</version>
   <scope>provided</scope>
</dependency> 

also fixes the issues

也解决了问题

回答by mmaceachran

For Maven, I also had to add the jsp-api dependency as a provided jar like this: (Some other dependency was pulling it in, I could never figure out which one, but this fixed it up)

对于 Maven，我还必须将 jsp-api 依赖项添加为提供的 jar，如下所示：（其他一些依赖项正在拉入它，我永远无法弄清楚是哪一个，但这修复了它）

<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>servlet-api</artifactId>
  <version>2.5</version>
  <scope>provided</scope>
</dependency>   
<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>jsp-api</artifactId>
  <version>2.0</version>
  <scope>provided</scope>
</dependency>     

回答by Brad Parks

The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory

方法 getJspApplicationContext(ServletContext) 未定义为 JspFactory 类型

This can also happen when your project requires a reference to a server runtime:

当您的项目需要对服务器运行时的引用时，也会发生这种情况：

• Right click on your project in Eclipse's "Project Explorer"
• Choose "Build Path | Configure Build Path"
• Click on the "Libraries" tab
• Click "Add Library"
• Select "Server Runtime" and click "Next"
• Choose "Apache Tomcat 7", or whatever your server runtime version should be.

• 在 Eclipse 的“项目资源管理器”中右键单击您的项目
• 选择“构建路径|配置构建路径”
• 单击“库”选项卡
• 点击“添加库”
• 选择“服务器运行时”，然后单击“下一步”
• 选择“Apache Tomcat 7”，或任何您的服务器运行时版本。

Note: This error can also happen for ANT builds, and for that case, you need to reference a target runtime in your ANT build.xml file... The following references a local tomcat installation, and uses its "lib" folders when doing the compile:

注意：ANT 构建也可能发生此错误，对于这种情况，您需要在 ANT build.xml 文件中引用目标运行时...以下引用本地 tomcat 安装，并在执行时使用其“lib”文件夹编译：

<project name="tomcat-demo" default="compile" basedir=".">
    <property name="tomcat-home" value="/path/to/your/tomcat/apache-tomcat-7" />

    <path id="project-classpath">
        <fileset dir="WebContent/WEB-INF/lib" includes="*.jar" />
        <fileset dir="${tomcat-home}/bin" includes="*.jar" />
        <fileset dir="${tomcat-home}/common/lib" includes="*.jar" />
        <fileset dir="${tomcat-home}/server/lib" includes="*.jar" />
    </path>
   ...
</project>

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