How to implement Hikari connection pool and configure JMX monitoring using SpringBoot

Hikari is Spring Boot’s default database connection pool. Different from C3P0, which obtains various status indicators directly through the connection pool object, Hikari needs to obtain them through JMX. The demo is as follows, using Spring Boot integration to collect connection status regularly.

public static void main(String[] args) throws SQLException, MalformedObjectNameException, InterruptedException {
 SpringApplication.run(HikariTest.class, args);
 HikariDataSource hikaridatasource = new HikariDataSource();
 hikaridatasource.setJdbcUrl("jdbc:mysql://localhost:3306?serverTimezone=GMT");
 hikaridatasource.setUsername("root");
 hikaridatasource.setPassword("");
 hikaridatasource.setDriverClassName("com.mysql.cj.jdbc.Driver");
 hikaridatasource.setRegisterMbeans(true);
 hikaridatasource.setPoolName("HikariConnectionPool");
 MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
 ObjectName poolName = new ObjectName("com.zaxxer.hikari:type=Pool (" + hikaridatasource.getPoolName() + ")");
 poolProxy = JMX.newMXBeanProxy(mBeanServer, poolName, HikariPoolMXBean.class);
 Connection conn = hikaridatasource.getConnection();
 Statement sm = conn.createStatement();
 ResultSet rs = null;
 for (int i = 0; i < 999999999; i++) {
  rs = sm.executeQuery("select name from test.t1");
 }
 rs.close();
 sm.close();
 conn.close();
 hikaridatasource.close();
}

@Scheduled(fixedRate = 1000)
public void HikariMonitor() {
 if(poolProxy == null) {
  log.info("Hikari not initialized,please wait...");
 }else {
  log.info("HikariPoolState = "
  + "Active=[" + String.valueOf(poolProxy.getActiveConnections() + "] "
  + "Idle=[" + String.valueOf(poolProxy.getIdleConnections() + "] "
  + "Wait=["+poolProxy.getThreadsAwaitingConnection()+"] "
  + "Total=["+poolProxy.getTotalConnections()+"]")));
 } 
}

In addition, there is such an issue mentioned on github:

ObjectName poolName = new ObjectName("com.zaxxer.hikari:type=Pool (" + hikaridatasource.getPoolName() + ")");

may throw an error

22:06:23.231 [ main] DEBUG com.zaxxer.hikari.HikariConfig - Driver class com.mysql.cj.jdbc.Driver found in Thread context class loader sun.misc.Launcher$AppClassLoader@73d16e93
Exception in thread "main" java.lang. reflect.UndeclaredThrowableException
at com.sun.proxy.$Proxy2.getIdleConnections(Unknown Source)
at com.zte.hikariTest.HikariTest.main(HikariTest.java:32)
Caused by: javax.management .InstanceNotFoundException: com.zaxxer.hikari:type=Pool (foo)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(Unknown Source)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute( Unknown Source)
at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(Unknown Source)
at com.sun.jmx.mbeanserver.MXBeanProxy$GetHandler.invoke(Unknown Source)
at com.sun .jmx.mbeanserver.MXBeanProxy.invoke(Unknown Source)
at javax.management.MBeanServerInvocationHandler.invoke(Unknown Source)
... 2 more

This is because Hikari sets parameters It also supports two configuration methods: setHikariConfig and configuration file. Please choose one of them for configuration instead of using both together. And please configure the properties as follows, otherwise JMX will not take effect.

hikaridatasource.setRegisterMbeans(true);

The code effect is as follows

2019-03-09 02:05:04.738 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1] Idle=[9] Wait=[0] Total=[10]
2019-03-09 02:05:05.740 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1 ] Idle=[9] Wait=[0] Total=[10]
2019-03-09 02:05:06.732 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1] Idle=[ 9] Wait=[0] Total=[10]
2019-03-09 02:05:07.738 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1] Idle=[9] Wait= [0] Total=[10]

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