Failed to execute goal org.apache.maven.plugins:maven-compiler

package com.example.demo.register; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.*; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; @Controller @CrossOrigin @RequestMapping("/register") public class Register { @PostMapping("/adduser") public static void adduser( User user) throws Exception { //加载JDBC驱动包 Class.forName("com.mysql.cj.jdbc.Driver"); //连接后端数据库 Connection connection = DriverManager.getConnection( "jdbc:mysql://127.0.0.1:3306/user","root","zh20020115" ); //操纵数据库 PreparedStatement pre = connection.prepareStatement( "insert into `user`(name password) values (?,?)" ); pre.setString(1,user.getName()); pre.setString(2,user.getPassword()); int re = pre.executeUpdate(); System.out.println(re); // while (set.next()){ // System.out.println(set.getString("name")+"的密码是"+set.getNString("password")); // } connection.close(); pre.close(); // set.close(); } }