Checkpoint check-in, this is not final code at all...

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

@@ -185,7 +185,7 @@ public abstract class BaseHikariPool implements HikariPoolMBean, IBagStateListen
             }
 
             final long now = System.currentTimeMillis();
-            if (bagEntry.evicted || (now - bagEntry.lastAccess > ALIVE_BYPASS_WINDOW && !isConnectionAlive(bagEntry.connection))) {
+            if (bagEntry.evicted || (now - bagEntry.lastAccess > ALIVE_BYPASS_WINDOW && !isConnectionAlive(bagEntry.connection, timeout))) {
                closeConnection(bagEntry); // Throw away the dead connection and try again
                timeout = connectionTimeout - elapsedTimeMs(start);
             }
@@ -433,7 +433,7 @@ public abstract class BaseHikariPool implements HikariPoolMBean, IBagStateListen
     * @param timeoutMs the timeout before we consider the test a failure
     * @return true if the connection is alive, false if it is not alive or we timed out
     */
-   protected abstract boolean isConnectionAlive(final Connection connection);
+   protected abstract boolean isConnectionAlive(final Connection connection, final long timeoutMs);
 
    /**
     * Attempt to abort() active connections on Java7+, or close() them on Java6.

hikaricp-common/src/test/java/com/zaxxer/hikari/ShutdownTest.java

@@ -244,7 +244,7 @@ public class ShutdownTest
       final HikariConfig config = new HikariConfig();
       config.setMinimumIdle(5);
       config.setMaximumPoolSize(5);
-      config.setConnectionTimeout(200);
+      config.setConnectionTimeout(1000);
       config.setInitializationFailFast(true);
       config.setConnectionTestQuery("VALUES 1");
       config.setDataSourceClassName("com.zaxxer.hikari.mocks.StubDataSource");

hikaricp-common/src/test/java/com/zaxxer/hikari/TestConnections.java

@@ -239,7 +239,7 @@ public class TestConnections
       HikariConfig config = new HikariConfig();
       config.setMinimumIdle(1);
       config.setMaximumPoolSize(4);
-      config.setConnectionTimeout(500);
+      config.setConnectionTimeout(1000);
       config.setInitializationFailFast(false);
       config.setConnectionTestQuery("VALUES 1");
       config.setDataSourceClassName("com.zaxxer.hikari.mocks.StubDataSource");

hikaricp-common/src/test/java/com/zaxxer/hikari/TestValidation.java

@@ -144,7 +144,7 @@ public class TestValidation
          Assert.fail();
       }
       catch (IllegalArgumentException ise) {
-         Assert.assertTrue(ise.getMessage().contains("connectionTimeout cannot be less than 100ms"));
+         Assert.assertTrue(ise.getMessage().contains("connectionTimeout cannot be less than 1000ms"));
       }
    }
 

hikaricp-java6/src/main/java/com/zaxxer/hikari/pool/HikariPool.java

@@ -139,7 +139,7 @@ public final class HikariPool extends BaseHikariPool
     * @return true if the connection is alive, false if it is not alive or we timed out
     */
    @Override
-   protected boolean isConnectionAlive(final Connection connection)
+   protected boolean isConnectionAlive(final Connection connection, final long timeoutMs)
    {
       try {
          final int timeoutSec = (int) TimeUnit.MILLISECONDS.toSeconds(validationTimeout);

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

@@ -118,13 +118,14 @@ public final class HikariPool extends BaseHikariPool
     * Check whether the connection is alive or not.
     *
     * @param connection the connection to test
+    * @param timeoutMs the timeout before we consider the test a failure
     * @return true if the connection is alive, false if it is not alive or we timed out
     */
    @Override
-   protected boolean isConnectionAlive(final Connection connection)
+   protected boolean isConnectionAlive(final Connection connection, final long timeoutMs)
    {
       try {
-         final int timeoutSec = (int) TimeUnit.MILLISECONDS.toSeconds(validationTimeout);
+         int timeoutSec = (int) TimeUnit.MILLISECONDS.toSeconds(validationTimeout);
 
          if (isUseJdbc4Validation) {
             return connection.isValid(timeoutSec);