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。
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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：
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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$AppClassLoader@73d16e93
Exception in thread "main" java.lang.reflect.UndeclaredThrowableException
at com.sun.proxy.$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
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。
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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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原文鏈接：https://juejin.cn/post/6844903793063100424
