com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException:_Too_many_connections

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.(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

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