servlet跳转问题，我觉得没有错误了，但最后结果出错，求帮助
1.ThreeParams.java
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class ThreeParams extends HttpServlet {

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter pw = response.getWriter();
pw.println(request.getParameter("param1"));
pw.println("<br>");
pw.println(request.getParameter("param2"));
pw.println("<br>");
pw.println(request.getParameter("param3"));
pw.println("<br>");
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}

}
2.ThreeParams.html
<form id="form1" name="form1" method="get" action="ThreeParams">
<table width="343" border="1">
<tr>
<td width="92">param1</td>
<td width="94"><input name="param1" type="text"

id="param1"/></td>
</tr>
<tr>
<td>param2</td>
<td><label>
<input name="param2" type="text" id="param2"/>
</label></td>
</tr>
<tr>
<td>param3</td>
<td><input name="param3" type="text" id="param3"/></td>
</tr>
<tr>
<td> </td>
<td><label>
<input type="submit" value="提交"/>
</label></td>

</tr>
</table>
</form>
3.web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0"
metadata-complete="true">
<servlet>
<servlet-name>ThreeParams</servlet-name>
<servlet-class>ThreeParams</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>ThreeParams</servlet-name>
<url-pattern>/ThreeParams</url-pattern>
</servlet-mapping>
</web-app>
运行：http://192.168.0.103:8080/test/ThreeParams.html
结果：

我填入数据

提交后就出现错误

很不懂为什么会这样，请你们帮帮我！ Servlet
[解决办法]
你的这些代码默认情况下没有什么问题。可以正常执行并打印出内容。我测试没问题