Project startup error: too many database connections

The project database source uses druid

When the project starts, an error is reported when connecting to the database: Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections"

 

That is, there are too many connections;

 

Solution: temporarily change the number of database connections to a smaller value

 

specific method:

    <bean id="baseDataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">

        ........

        <!-- Configure initialization size, minimum, maximum -->

        <property name="initialSize" value="3" />

        <property name="minIdle" value="3" />

        <property name="maxActive" value="3" />

        ........

 

Modify the value of maxActive to a smaller number, such as 3, and restart the project;

 

We understand the specific meaning of the following configuration:

initialSize	0	The number of physical connections established during initialization. Initialization occurs when the init method is explicitly called, or the first time getConnection
maxActive	8	Maximum number of connection pools
maxIdle	8	It is no longer used, and the configuration has no effect
minIdle		Minimum number of connection pools
maxWait		The maximum wait time when getting a connection, in milliseconds. After configuring maxWait, fair lock is enabled by default, and the concurrency efficiency will decrease. If necessary, you can configure useUnfairLock