Hikari是Spring Boot默认的数据库连接池。区别于C3P0直接通过连接池对象获取各项状态指标，Hikari需要通过JMX来获取。Demo如下，采用Spring Boot集成，定时采集连接状态。
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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()+"]")));
}
}
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另外，在github有提到这样的issue：
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1
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ObjectName poolName = new ObjectName("com.zaxxer.hikari:type=Pool (" + hikaridatasource.getPoolName() + ")");
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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$AppClassLoader@73d16e93
Exception in thread "main" java.lang.reflect.UndeclaredThrowableException
at com.sun.proxy.$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
这是因为Hikari设置参数同样支持setHikariConfig和配置文件两种配置方式，请选择其中一种进行配置，而不是二者一起使用。并且请配置属性如下，否则 JMX 无法生效。
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1
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hikaridatasource.setRegisterMbeans(true);
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代码效果如下所示
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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原文链接：https://juejin.cn/post/6844903793063100424