Hikari是Spring Boot默認的數據庫連接池。區別于C3P0直接通過連接池對象獲取各項狀態指標，Hikari需要通過JMX來獲取。Demo如下，采用Spring Boot集成，定時采集連接狀態。

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()+']'))); } }

另外，在github有提到這樣的issue：

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

可能會拋錯

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$AppClassLoader@73d16e93Exception in thread 'main' java.lang.reflect.UndeclaredThrowableException at com.sun.proxy.$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

這是因為Hikari設置參數同樣支持setHikariConfig和配置文件兩種配置方式，請選擇其中一種進行配置，而不是二者一起使用。并且請配置屬性如下，否則 JMX 無法生效。

hikaridatasource.setRegisterMbeans(true);

代碼效果如下所示

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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