java连接mysql 连接数太多

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Too many connections

show full processlist:查看有多少个线程实例

service mysqld stop
service mysqld start

show global variables like 'wait_timeout'

28800秒 = 8小时
show global variables like 'max_connections'

可以设置global
set global wait_timeout = 200；

也可以在my.cnf修改
wait_timeout=100
interactive_timeout=100