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I am trying to figure out how many connections are currently opened and I can't seem to find an obvious way to do that with Hikari.
HikariPool exposes that information (getActiveConnections) but I don't see an easy way to access that from HikariDataSource.
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"HikariCP is solid high-performance JDBC connection pool. A connection pool is a cache of database connections maintained so that the connections can be reused when future requests to the database are required. Connection pools may significantly reduce the overall resource usage." - You can find out more here.
Configuring Hikari With Spring Boot 1. x uses the Tomcat JDBC Connection Pool by default. As soon as we include spring-boot-starter-data-jpa into our pom. xml, we'll transitively include a dependency to the Tomcat JDBC implementation. During runtime, Spring Boot will then create a Tomcat DataSource for us to use.
If you are using spring boot:
new HikariDataSourcePoolMetadata(dataSource).getActive();
You'll have to get it via JMX programmatic access. First, enable MBean registration through the registerMbeans property or by calling setRegisterMeans(). Then consult this page for how to perform programmatic access:
https://github.com/brettwooldridge/HikariCP/wiki/JMX-Monitoring
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