Hikari是SpringBoot 2.0中默认的连接池。
区别于c3p0间接通过连接池对象获取各项状态指标，Hikari须要通过JMX来获取。
示例代码如下，采纳SpringBoot集成，定时采集连接池连贯状态。
@Component@Controller@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)@EnableSchedulingpublic class HikariTest {    private static HikariPoolMXBean poolProxy;    private static final Logger log = LoggerFactory.getLogger(HikariTest.class);    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("db10$ZTE");        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，在github上，有几位小伙伴都提出了同样的issue（我也遇到了），在

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

可能会抛错

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
Hikari设置参数同样反对setHikariConfig和配置文件两种配置形式，请抉择其中一种进行配置，而不是二者一起应用。并且请配置属性如下，否则JMX无奈失效。
hikaridatasource.setRegisterMbeans(true);

代码成果如下所示

2019-03-09 02:05:03.725 INFO com.zte.hikariTest.HikariTest.67 -Hikari connection pool is not already...please wait...2019-03-09 02:05:03.726 INFO o.a.c.http11.Http11NioProtocol.173 -Starting ProtocolHandler ["http-nio-8080"]2019-03-09 02:05:03.760 INFO o.s.b.w.e.t.TomcatWebServer.204 -Tomcat started on port(s): 8080 (http) with context path ''2019-03-09 02:05:03.763 INFO com.zte.hikariTest.HikariTest.59 -Started HikariTest in 3.487 seconds (JVM running for 3.98)2019-03-09 02:05:03.775 INFO c.z.hikari.HikariDataSource.110 -HikariConnectionPool - Starting...2019-03-09 02:05:04.439 INFO c.z.hikari.HikariDataSource.123 -HikariConnectionPool - Start completed.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]