how to check HikariCP connection pooling is working or not in Java?

Question

I have written following properties in my configuration files I am using Log4j in my application When I am running a project.

I am getting following message.does that mean connection pooling is configured in my project? if not then how it will be?

INFO: internal.ConnectionProviderInitiator - HHH000130: Instantiating explicit connection provider: com.zaxxer.hikari.hibernate.HikariConnectionProvider

I have referred following link also

link here

Datasource settings

hibernate.datasource.driver-class-name=com.mysql.jdbc.Driver
hibernate.datasource.url=jdbc:mysql://localhost:3306/mydb
hibernate.datasource.username=root
hibernate.datasource.password=root

HikariCP Settings

hibernate.hikari.dataSource.url=jdbc:mysql://localhost:3306/mydb
hibernate.hikari.idleTimeout=10
hibernate.hikari.maximumPoolSize=30
hibernate.hikari.minimumIdle=15
hibernate.connection.provider_class=com.zaxxer.hikari.hibernate.HikariConnectionProvider
hibernate.hikari.dataSourceClassName=com.mysql.jdbc.jdbc2.optional.MysqlDataSource

Answer 1

First, configuration is no consistent since maximum < minimumIdle. Those should be set at most to the same value.

hibernate.hikari.maximumPoolSize=10
hibernate.hikari.minimumIdle=10

If the pools is working you should see 10 ESTABLISHED connections to port 3306.

netstat -ant | grep 3306
tcp        0      0 127.0.0.1:41722     127.0.0.1:3306      ESTABLISHED 
tcp        0      0 127.0.0.1:41730     127.0.0.1:3306      ESTABLISHED 
tcp        0      0 127.0.0.1:41728     127.0.0.1:3306      ESTABLISHED 
tcp        0      0 127.0.0.1:41726     127.0.0.1:3306      ESTABLISHED 
tcp        0      0 127.0.0.1:41716     127.0.0.1:3306      ESTABLISHED 
tcp        0      0 127.0.0.1:41732     127.0.0.1:3306      ESTABLISHED 
tcp        0      0 127.0.0.1:41720     127.0.0.1:3306      ESTABLISHED 
tcp        0      0 127.0.0.1:41736     127.0.0.1:3306      ESTABLISHED 
tcp        0      0 127.0.0.1:41718     127.0.0.1:3306      ESTABLISHED 
tcp        0      0 127.0.0.1:41724     127.0.0.1:3306      ESTABLISHED

Answer 2

See HikariCP note about MySQL:

The MySQL DataSource is known to be broken with respect to network timeout support. Use jdbcUrl configuration instead.

You need to remove the below line and Hikari will find the driver

hibernate.datasource.driver-class-name=com.mysql.jdbc.Driver

jdbcUrl This property directs HikariCP to use "DriverManager-based" configuration. We feel that DataSource-based configuration (above) is superior

Also try adding the following as suggested when using Hibernate4:

hibernate.hikari.dataSource.url=jdbc:mysql://localhost/database
hibernate.hikari.dataSource.user=bart
hibernate.hikari.dataSource.password=51mp50n

Answer 3

1. Have you tried using the app to insert/update something in the database? If it fails then it's not working.

2. Another way to test it is change the datasource you provided here: hibernate.hikari.dataSource.url to a non-existing database.

3. Finally, change the <Configuration status="WARN"> to <Configuration status="DEBUG">