Java ValidateLogin内部错误500

我试图使用JSP创建一个登录进程，并将它们链接到我的MySQL数据库。我遇到的问题是，单击“登录”后，我的浏览器出现内部错误（500）

我已经为servlet ValidateLogin.java设置了web.xml，我知道这不是问题所在。有人能帮我吗？我将把我的代码放在下面，它涉及我的HtmlServlet请求和响应

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ValidateLogin extends HttpServlet {

    Connection connect;
    ResultSet result;
    String username, password, query;
    DatabaseConnection database_connection;

    protected void processRequest(HttpServletRequest request,HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UF-8");
    PrintWriter out = response.getWriter();
    try {

    // Code Here...

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

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

    @Override
    public String getServletInfo() {
    return "Short description";
    }
}

---

没关系，我解决了这个问题

将代码从更改为

    //FROM
    response.setContentType("text/html;charset=UF-8");
    //TO
    response.setContentType("text/html");