remove unused @internal method

Author: gavinking

hibernate-c3p0/src/main/java/org/hibernate/c3p0/internal/C3P0ConnectionProvider.java

@@ -161,7 +161,7 @@ public void configure(Map<String, Object> properties) {
 				jdbcDriverClass,
 				dialect.getVersion(),
 				Boolean.toString( autocommit ),
-				isolation != null ? ConnectionProviderInitiator.toIsolationNiceName( isolation ) : null,
+				isolation == null ? null : ConnectionProviderInitiator.toIsolationNiceName( isolation ),
 				requireNonNullElse( getInteger( C3P0_STYLE_MIN_POOL_SIZE.substring( 5 ), poolSettings ),
 						DEFAULT_MIN_POOL_SIZE ),
 				requireNonNullElse( getInteger( C3P0_STYLE_MAX_POOL_SIZE.substring( 5 ), poolSettings ),

hibernate-core/src/main/java/org/hibernate/engine/jdbc/connections/internal/DriverManagerConnectionProviderImpl.java

@@ -361,11 +361,6 @@ public boolean isValid(Connection connection) throws SQLException {
 		return true;
 	}
 
-	@Internal
-	public void releasePooledConnections() {
-		state.pool.releasePooledConnections();
-	}
-
 	public static class PooledConnections {
 
 		private final ConcurrentLinkedQueue<Connection> allConnections = new ConcurrentLinkedQueue<>();
@@ -438,7 +433,7 @@ protected Connection releaseConnection(Connection conn) {
 			return null;
 		}
 
-		public Connection poll() throws SQLException {
+		public Connection poll() {
 			Connection conn;
 			do {
 				conn = availableConnections.poll();