tweak isConnectionAlive and few other

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

@@ -242,9 +242,7 @@ public class HikariPool implements HikariPoolMXBean, IBagStateListener
          LOGGER.info("{} - is closing down.", poolName);
          logPoolState("Before closing ");
 
-         connectionBag.close();
-         softEvictConnections();
-         addConnectionExecutor.shutdownNow();
+         addConnectionExecutor.shutdown();
          addConnectionExecutor.awaitTermination(5L, TimeUnit.SECONDS);
          if (config.getScheduledExecutorService() == null) {
             houseKeepingExecutorService.shutdown();
@@ -253,6 +251,7 @@ public class HikariPool implements HikariPoolMXBean, IBagStateListener
 
          final ExecutorService assassinExecutor = createThreadPoolExecutor(config.getMaximumPoolSize(), "Hikari connection assassin",
                                                                            config.getThreadFactory(), new ThreadPoolExecutor.CallerRunsPolicy());
+         connectionBag.close();
          try {
             final long start = clockSource.currentTime();
             do {
@@ -365,7 +364,7 @@ public class HikariPool implements HikariPoolMXBean, IBagStateListener
             while (poolState == POOL_NORMAL && totalConnections.get() < maxPoolSize && getIdleConnections() <= minimumIdle && !addConnection()) {
                // If we got into the loop, addConnection() failed, so we sleep and retry
                quietlySleep(sleepBackoff);
-               sleepBackoff = Math.min(connectionTimeout / 2, (long) ((double) sleepBackoff * 1.5));
+               sleepBackoff = Math.min((long) (connectionTimeout / 2), (long) (sleepBackoff * 1.5));
             }
          }
       }, true);

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

@@ -182,8 +182,10 @@ public final class PoolBagEntry implements IConcurrentBagEntry
    @Override
    public String toString()
    {
-      return String.format("%s (created %s, last release %dms ago, %s)",
-                           connection, formatDateTime(creationTime), ClockSource.INSTANCE.elapsedMillis(lastAccess), stateToString());
+      return connection
+         + ", created " + formatDateTime(creationTime)
+         + ", last release " + ClockSource.INSTANCE.elapsedMillis(lastAccess) + "ms ago, "
+         + stateToString();
    }
 
    void close()

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

@@ -219,7 +219,9 @@ public final class PoolElf
          final int originalTimeout = getAndSetNetworkTimeout(connection, validationTimeout);
    
          try (Statement statement = connection.createStatement()) {
-            setQueryTimeout(statement, timeoutSec);
+        	if (isNetworkTimeoutSupported != TRUE) {
+               setQueryTimeout(statement, timeoutSec);
+        	}
             statement.execute(config.getConnectionTestQuery());
          }