Oracle+jspで、ORA-01000: 最大オープン・カーソル数を超えました。

public void process(String sql,Processable processable) throws Exception {
	getConnection();
	try {
		Statement statement = connection.createStatement();
		ResultSet resultSet = statement.executeQuery(sql);

		processable.process(resultSet);

		resultSet.close();
		statement.close();
	}
	catch(Exception e) {
		throw e;
	}
	finally {
		releaseConnection(); 
	}
}

interface Processable {
	void process(ResultSet resultSet) throws SqlException;
}

class SampleProcessable implements Processable {
	public void process(ResultSet resultSet) throws SqlException {
		while (resultSet.next()) {
			//処理
		}
	}
}