Java 嵌入式 Jetty 服务器 - 没有 JSP 支持 /，没有找到 org.apache.jasper.servlet.JspServlet
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Embedded Jetty Server - NO JSP Support for /, did not find org.apache.jasper.servlet.JspServlet
提问by
I've have the following code to use an embedded Jetty server alongside a simple servlet and .jsp webpage. However, after compiling and running the code:
我有以下代码来使用嵌入式 Jetty 服务器以及一个简单的 servlet 和 .jsp 网页。但是，在编译并运行代码之后：
javac -cp lib/servlet-api.jar:lib/jetty-all.jar com/test/MyServlet.java
javac -cp lib/servlet-api.jar:lib/jetty-all.jar com/test/ServerMain.java
java -cp .:lib/servlet-api.jar:lib/jetty-all.jar com/test/ServerMain
I get an error:
我收到一个错误：
INFO:oejw.StandardDescriptorProcessor:main: NO JSP Support for /, did not find org.apache.jasper.servlet.JspServlet
And navigating to /index.jsp gives a 500 error.
导航到 /index.jsp 会出现 500 错误。
HTTP ERROR 500
Problem accessing /index.jsp.
Reason:
JSP support not configured
I've read this postbut I don't think the solution applies here because I'm running Jetty embedded rather than using the start.jar.
我已经阅读了这篇文章，但我认为该解决方案不适用于这里，因为我运行的是嵌入式 Jetty，而不是使用 start.jar。
How can I resolve this error so that the server will run and serve .jsp pages successfully?
如何解决此错误，以便服务器能够成功运行并提供 .jsp 页面？
ServerMain.java
服务器主程序
package com.test;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.webapp.WebAppContext;
public class ServerMain {
public static void main(String[] args) throws InterruptedException {
Server server = new Server(8080);
WebAppContext webApp = new WebAppContext();
webApp.setDescriptor("web.xml");
webApp.setResourceBase("");
webApp.setParentLoaderPriority(true);
server.setHandler(webApp);
try {
server.start();
} catch (Exception e) {
e.printStackTrace();
System.exit(-1);
}
server.join();
}
}
MyServlet.java
我的Servlet.java
package com.test;
import java.io.IOException;
import java.util.Properties;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyServlet extends HttpServlet {
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
resp.setContentType("text/plain");
resp.getWriter().println("Hello, this is a testing servlet. \n\n");
Properties p = System.getProperties();
p.list(resp.getWriter());
}
}
web.xml
网页.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE web-app PUBLIC "-//Oracle Corporation//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5">
<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>com.test.MyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/test</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
This is my project structure:
这是我的项目结构：
webapp
----com
----test
----MyServlet.java
----ServerMain.java
----index.jsp
----web.xml
----lib
----jetty-all.jar
----servlet-api.jar
采纳答案by msrd0
It seems like you're missing an JAR-file that includes the class org.apache.jasper.servlet.JspServlet. Download a JAR file containing it (look here) and add it to your classpath. Also, on a side note, you should replace com/test/ServerMainwith the real class name, com.test.ServerMain. You java statement should look like this:
您似乎缺少一个包含 class 的 JAR 文件org.apache.jasper.servlet.JspServlet。下载包含它的 JAR 文件（查看此处）并将其添加到您的类路径中。另外，附带说明一下，您应该替换com/test/ServerMain为真实的类名com.test.ServerMain. 您的 java 语句应如下所示：
java -cp ".:lib/servlet-api.jar:lib/jetty-all.jar:lib/apache-jasper.jar" com.test.ServerMain
回答by Joakim Erdfelt
Incidentally, there's a github project, maintained by the Jetty Project, demonstrating JSP support in Jetty Embedded.
顺便说一下，有一个由 Jetty 项目维护的 github 项目，它展示了 Jetty Embedded 中的 JSP 支持。
回答by Nux
Haven't tried for embedded Jetty but when running Jetty 9.3 as a service you need to add JSP support.
尚未尝试嵌入 Jetty，但在将 Jetty 9.3 作为服务运行时，您需要添加 JSP 支持。
cd $JETTY_BASE
$JAVA_HOME/bin/java -jar $JETTY_HOME/start.jar --add-to-startd=jsp
Where JETTY_BASEis your folder where you deploy application which is separate from JETTY_HOME. So I'm guessing embedded Jetty would need similar configuration.
哪里JETTY_BASE是你的文件夹中部署应用程序，它是从不同的JETTY_HOME。所以我猜嵌入式 Jetty 需要类似的配置。
