Exception in thread "main" java.sql.SQLException: The server time zone value ‘?й???????‘ is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the ‘serverTimezone‘ configuration property) to use a more specifc time zone value if you want to utilize time zone support.
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