at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73)
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76)
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836)
at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456)
at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197)
at com.mysql.cj.jdbc.MysqlDataSource.getConnection(MysqlDataSource.java:416)
at com.mysql.cj.jdbc.MysqlDataSource.getConnection(MysqlDataSource.java:128)
at com.mysql.cj.jdbc.MysqlDataSource.getConnection(MysqlDataSource.java:113)
at test.jar_test.main(jar_test.java:51)
解决办法：连接数据库时：
((MysqlDataSource) dataSource).setURL("jdbc:mysql://127.0.0.1:3306/mysql1?characterEncoding=utf-8&useSSL=true");
修改为：
((MysqlDataSource) dataSource).setURL("jdbc:mysql://127.0.0.1:3306/mysql1?serverTimezone=UTC&useSSL=true");
SQLException: The server time zone value '?й???????' is unrecognized 解决办法
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