成功链接数据库
com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL client
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:921)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:885)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3421)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1247)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2775)
at com.mysql.jdbc.Connection.(Connection.java:1555)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at cn.itcast.jdbc.example.utils.JDBCUtils.getConnection(JDBCUtils.java:16)
at cn.itcast.jdbc.example.dao.UsersDao.findAll(UsersDao.java:54)
at cn.itcast.jdbc.example.FindAllUsersTest.main(FindAllUsersTest.java:10)
Exception in thread "main" java.lang.NullPointerException
at cn.itcast.jdbc.example.FindAllUsersTest.main(FindAllUsersTest.java:12)
not support authentication protocol 不支持的验证协议，要升级客户端。
好的