com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Too many connections
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:921)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2822)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:777)
        at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3231)
        at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1147)
        at com.mysql.jdbc.Connection.createNewIO(Connection.java:2595)
        at com.mysql.jdbc.Connection.<init>(Connection.java:1509)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
        at java.sql.DriverManager.getConnection(DriverManager.java:571)
        at java.sql.DriverManager.getConnection(DriverManager.java:215)
        at util.mysql.MySQLUtil.getConnection(MySQLUtil.java:36)
        at logic.BulletinDao.addProduct(BulletinDao.java:87)
        at Bulletin.main(Bulletin.java:84)

 

解决：关闭连接 或者 调整服务的max_connections