Return available fields and their type from SQL Query

SqlQueryHelper.java

public class SqlQueryHelper {

	public List<SimpleEntry<String, Type>> getAvailableFieldsFromQuery(
			String sqlQuery) {
		List<SimpleEntry<String, Type>> availableFields = new ArrayList<SimpleEntry<String, Type>>();
		Connection c = null;
		Statement st = null;
		Session sess = null;
		try {
			Session delegate = (Session) entityManager.getDelegate();
			sess = delegate.getSessionFactory().openSession();
			c = sess.connection();
			st = c.createStatement();
			ResultSet rs = st.executeQuery("select * from (" + sqlQuery
					+ ") where rownum<0");
			for (int i = 1; i <= rs.getMetaData().getColumnCount(); i++) {
				availableFields.add(new SimpleEntry(rs.getMetaData()
						.getColumnName(i), rs.getMetaData().getColumnClassName(
						i)));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				st.close();
				c.close();
				sess.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		return availableFields;
	}
}