Change how autoCommit and transaction isolation are reset

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

@@ -404,6 +404,8 @@ public final class HikariPool implements HikariPoolMBean
             connection.setAutoCommit(isAutoCommit);
             connection.setTransactionIsolation(transactionIsolation);
 
+            try
+            {
                 if (jdbc4ConnectionTest)
                 {
                     return connection.isValid((int) TimeUnit.MILLISECONDS.toSeconds(timeoutMs));
@@ -413,6 +415,14 @@ public final class HikariPool implements HikariPoolMBean
                 {
                     statement.executeQuery(configuration.getConnectionTestQuery());
                 }
+            }
+            finally
+            {
+                if (!isAutoCommit)
+                {
+                    connection.commit();
+                }
+            }
 
             return true;
         }