set maxPoolSize = minIdle only if undefined, consistent error messages

src/main/java/com/zaxxer/hikari/HikariConfig.java

@@ -117,7 +117,7 @@ public class HikariConfig implements HikariConfigMXBean
       healthCheckProperties = new Properties();
 
       minIdle = -1;
-      maxPoolSize = 10;
+      maxPoolSize = -1;
       maxLifetime = MAX_LIFETIME;
       connectionTimeout = CONNECTION_TIMEOUT;
       validationTimeout = VALIDATION_TIMEOUT;
@@ -855,13 +855,15 @@ public class HikariConfig implements HikariConfigMXBean
          }
       }
 
-      if (minIdle < 0) {
-         minIdle = maxPoolSize;
-      }
-      else if (minIdle > maxPoolSize) {
-         LOGGER.warn("minIdle should be less than maxPoolSize, setting maxPoolSize to minIdle");
+      if (maxPoolSize < 0) {
+         if (minIdle < 0) {
+        	 minIdle = 10;
+         }
          maxPoolSize = minIdle;
       }
+      else if (minIdle < 0 || minIdle > maxPoolSize) {
+         minIdle = maxPoolSize;
+      }
    }
 
    private void logConfiguration()

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

@@ -405,7 +405,7 @@ public class HikariPool extends PoolBase implements HikariPoolMXBean, IBagStateL
       if (connectionBag.remove(poolEntry)) {
          final int tc = totalConnections.decrementAndGet();
          if (tc < 0) {
-            LOGGER.warn("{} - Internal accounting inconsistency, totalConnections={}", poolName, tc, new Exception());
+            LOGGER.warn("{} - Unexpected value of totalConnections={}", poolName, tc, new Exception());
          }
          final Connection connection = poolEntry.connection;
          poolEntry.close();

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

@@ -145,7 +145,7 @@ abstract class PoolBase
       }
       catch (SQLException e) {
          lastConnectionFailure.set(e);
-         LOGGER.warn("{} - Connection {} failed alive test with exception {}", poolName, connection, e.getMessage());
+         LOGGER.warn("{} - Failed to validate connection {} ({})", poolName, connection, e.getMessage());
          return false;
       }
    }
@@ -355,7 +355,7 @@ abstract class PoolBase
                connection.isValid(1);
             }
             catch (Throwable e) {
-               LOGGER.debug("{} - Connection.isValid() is not supported, configure connection test query. ({})", poolName, e.getMessage());
+               LOGGER.debug("{} - Failed to execute isValid() for connection, configure connection test query. ({})", poolName, e.getMessage());
                throw e;
             }
          }
@@ -388,7 +388,7 @@ abstract class PoolBase
          catch (Throwable e) {
             if (isQueryTimeoutSupported == UNINITIALIZED) {
                isQueryTimeoutSupported = FALSE;
-               LOGGER.debug("{} - Statement.setQueryTimeout() is not supported ({})", poolName, e.getMessage());
+               LOGGER.debug("{} - Unable to set query timeout for statement. ({})", poolName, e.getMessage());
             }
          }
       }
@@ -414,7 +414,7 @@ abstract class PoolBase
          catch (Throwable e) {
             if (isNetworkTimeoutSupported == UNINITIALIZED) {
                isNetworkTimeoutSupported = FALSE;
-               LOGGER.debug("{} - Connection.setNetworkTimeout() is not supported ({})", poolName, e.getMessage());
+               LOGGER.debug("{} - Unable to get/set network timeout for connection. ({})", poolName, e.getMessage());
             }
          }
       }
@@ -491,7 +491,7 @@ abstract class PoolBase
             command.run();
          }
          catch (Throwable t) {
-            LoggerFactory.getLogger(PoolBase.class).debug("Exception executing {}", command, t);
+            LoggerFactory.getLogger(PoolBase.class).debug("Failed to execute: {}", command, t);
          }
       }
    }
@@ -509,7 +509,7 @@ abstract class PoolBase
             dataSource.setLoginTimeout((int) TimeUnit.MILLISECONDS.toSeconds(Math.max(1000L, connectionTimeout)));
          }
          catch (Throwable e) {
-            LOGGER.warn("{} - Unable to set DataSource login timeout", poolName, e);
+            LOGGER.warn("{} - Unable to set login timeout for data source. ({})", poolName, e.getMessage());
          }
       }
    }