Refine JMX ObjectName (#1681)

fix https://github.com/brettwooldridge/HikariCP/issues/1678

src/main/java/com/zaxxer/hikari/pool/PoolBase.java

@@ -279,8 +279,14 @@ abstract class PoolBase
       try {
          final MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
 
-         final ObjectName beanConfigName = new ObjectName("com.zaxxer.hikari:type=PoolConfig (" + poolName + ")");
+         ObjectName beanConfigName, beanPoolName;
-         final ObjectName beanPoolName = new ObjectName("com.zaxxer.hikari:type=Pool (" + poolName + ")");
+         if ("true".equals(System.getProperty("hikaricp.jmx.register2.0"))) {
+             beanConfigName = new ObjectName("com.zaxxer.hikari:type=PoolConfig,name=" + poolName);
+             beanPoolName = new ObjectName("com.zaxxer.hikari:type=Pool,name=" + poolName);
+         } else {
+            beanConfigName = new ObjectName("com.zaxxer.hikari:type=PoolConfig (" + poolName + ")");
+            beanPoolName = new ObjectName("com.zaxxer.hikari:type=Pool (" + poolName + ")");
+         }
          if (register) {
             if (!mBeanServer.isRegistered(beanConfigName)) {
                mBeanServer.registerMBean(config, beanConfigName);

src/test/java/com/zaxxer/hikari/pool/TestMBean.java

@@ -96,6 +96,25 @@ public class TestMBean
       finally {
          System.clearProperty("com.zaxxer.hikari.housekeeping.periodMs");
       }
+
+      System.setProperty("hikaricp.jmx.register2.0", "true");
+
+      try (HikariDataSource ds = new HikariDataSource(config)) {
+
+         getUnsealedConfig(ds).setIdleTimeout(3000);
+
+         TimeUnit.SECONDS.sleep(1);
+
+         MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
+         ObjectName poolName = new ObjectName("com.zaxxer.hikari:type=Pool,name=testMBeanReporting");
+         HikariPoolMXBean hikariPoolMXBean = JMX.newMXBeanProxy(mBeanServer, poolName, HikariPoolMXBean.class);
+
+         assertEquals(0, hikariPoolMXBean.getActiveConnections());
+         assertEquals(3, hikariPoolMXBean.getIdleConnections());
+      }
+      finally {
+         System.clearProperty("hikaricp.jmx.register2.0");
+      }
    }
 
    @Test