Servlet程序在tomcat上配置好后网页进入显示500错误 - 编程论坛

Servlet源代码（类名：hw.class)
package xxxx;
import *;
import javax.servlet.*;
import javax.servlet.http.*;
public class hw extends HttpServlet{
    public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<html><head><title>");
        out.println("This is my first Servlet");
        out.println("</title></head><body>");
        out.println("<h1>Hello,world!</h1>");
        out.println("</body></html>");
    }
}
配置文件web.xml代码
<servlet>
  <servlet-name>hw</servlet-name>
  <servlet-class>hw</servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>hw</servlet-name>
  <url-pattern>/hw</url-pattern>
</servlet-mapping>
文件路径：

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下图是网页报错

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