导致系统不可用原因及密码验证

package com.crc.mam.admin.controller.system.demo;
import com.crc.mam.util.DigestUtils;
public class PasswordUtils {
    public static void main(String[] args) {
        String userId = "CYC";
        String plainPassWord = "md5password";
        String encryptionPassWord = getMD5(userId, plainPassWord);
        boolean passwordMatch = checkPW(userId, plainPassWord, encryptionPassWord);
        if (passwordMatch) {
            System.out.println("Provided user password " + plainPassWord + " is correct.");
        } else {
            System.out.println("Provided user password is incorrect!");
        }
    }
    private static boolean checkPW(String userId, String plainPassWord, String encryptionPassWord) {
        String generatePassWord = getMD5(userId, plainPassWord);
        return encryptionPassWord.equalsIgnoreCase(generatePassWord);
    }
    /**
     * 生成md5
     *
     * @param userId
     * @return
     */
    public static String getMD5(String userId, String password) {
        String str = userId + password;
        String md5 = DigestUtils.md5DigestAsHex(str.getBytes()).toUpperCase();
        return md5;
    }
}