Add additional debug-level logging.

hikaricp-common/src/main/java/com/zaxxer/hikari/pool/BaseHikariPool.java

@@ -412,6 +412,14 @@ public abstract class BaseHikariPool implements HikariPoolMBean, IBagStateListen
       for (int i = 0; i < connectionsToAdd; i++) {
          addBagItem();
       }
+
+      if (connectionsToAdd > 0 && LOGGER.isDebugEnabled()) {
+         addConnectionExecutor.execute(new Runnable() {
+            public void run() {
+               logPoolState("After fill ");
+            }
+         });
+      }
    }
 
    // ***********************************************************************

hikaricp-common/src/main/java/com/zaxxer/hikari/pool/PoolUtilities.java

@@ -50,6 +50,7 @@ public final class PoolUtilities
    {
       if (connection != null) {
          try {
+            LOGGER.debug("Closing connection {}", connection);
             setNetworkTimeout(connection, TimeUnit.SECONDS.toMillis(30));
             connection.close();
          }