系统报错：

Could not open JDBC Connection for transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Too many connections 

http://www.cndba.cn/dave/article/2184

解决方法

http://www.cndba.cn/dave/article/2184

查看当前值
[dave@www.cndba.cn bin]# mysql -ucndba -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or /g.
Your MySQL connection id is 868
Server version: 5.1.73-log Source distribution

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.
mysql> show variables like "max_connections";
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 151   |
+-----------------+-------+
1 row in set (0.00 sec)

临时修改：
mysql> set global max_connections = 1000;
Query OK, 0 rows affected (0.03 sec)

mysql> show variables like '%max_connections%'; 
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 1000  |
+-----------------+-------+
1 row in set (0.00 sec)

永久修改：
修改/etc/my.cnf
在[mysqld]下面添加
[mysqld]
max_connections = 1500

然后重启mysql数据库：
[dave@www.cndba.cn etc]# service mysqld stop
停止 mysqld：                                              [确定]
[dave@www.cndba.cn etc]# service mysqld start
正在启动 mysqld：

版权声明：本文为博主原创文章，未经博主允许不得转载。