servlet包的RequestDispatcher类没有FORWARD_REQUEST_URI字段 [英] RequestDispatcher class of the servlet package does not have FORWARD_REQUEST_URI field

问题描述

我正在尝试使用Maven构建Java EE应用程序。我的pom.xml中有以下内容：

I am trying to build a Java EE application using Maven. I have the following in my pom.xml:

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
    </dependency>

根据 http://download.oracle.com/javaee/6/api/constant-values.html#javax.servlet.RequestDispatcher。 FORWARD_REQUEST_URI ，FORWARD_REQUEST_URI字段应该在那里，但事实并非如此。

According to http://download.oracle.com/javaee/6/api/constant-values.html#javax.servlet.RequestDispatcher.FORWARD_REQUEST_URI , the FORWARD_REQUEST_URI field should be there, however it isn't.

[ERROR] foo.java:[296,53] cannot find symbol
symbol  : variable FORWARD_REQUEST_URI
location: interface javax.servlet.RequestDispatcher

项目目录中没有其他jar。我解压缩了〜/ .m2目录中的jar文件，它的文件可以追溯到5/10/2006。当我从pom.xml中删除依赖项时，它根本不编译。 （我安装了使用Netbeans EE的Glassfish服务器，所以我实际上可能会使用服务器的罐子吗？）

There are no other jars inside the project directory. I unzipped the jar file found in ~/.m2 directory, and it has files dating back to 5/10/2006. When I delete the dependency from the pom.xml, it doesn't compile at all. (I have Glassfish server installed with Netbeans EE, so I may actually use the server's jars I suppose?)

推荐答案

这个常数是在Servlet 3.0中引入。它在Servlet 2.5中不存在，另请参阅 RequestDispatcher javadoc 。如果您使用的是Glassfish 3.x，它是一个Servlet 3.0容器，那么您应该能够将pom中的版本更新为 3.0 。然而，它应该是< scope>提供< / scope> 依赖。

This constant was introduced in Servlet 3.0. It's not present in Servlet 2.5, see also the Java EE 5 version of the RequestDispatcher javadoc. If you're using Glassfish 3.x, which is a Servlet 3.0 container, then you should be able to update the version in pom to 3.0. It's however supposed to be an <scope>provided</scope> dependency.

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