系统运行一段时间后发现出现这样的异常:
Couldn't get connection because we are at maximum connection count (150/150) and there are none available
解决方案：
1、修改连接池的最大的连接数：
<maximum-connection-count>1000</maximum-connection-count>
2、
更改hibernate.connection.release_mode配置的模式为：after_transaction
Hibernate 的连接释放模式：hibernate.connection.release_mode 有三个选择：after_statement/after_transaction/on_close，默认的是on_close所以，这里要改成after_transaction
<prop key="hibernate.connection.release_mode">after_transaction</prop>
