Coding style comparison...

NetworkServiceImpl1.java

// ....

  public RepositoryHolder getRepositories() throws AppException {
    final String query = "select id, repo_url from localdb.sys_network.repositories";
    List<Repository> repo_list = new ArrayList<Repository>();
    Repository master = new Repository();
    DB.execute(query, master, repo_list);

    RepositoryHolder ret = new RepositoryHolder();
    ret.repositories = repo_list;
    return ret;
  }

NetworkServiceImpl2.java

import java.sql.*;
// ....

  public RepositoryHolder getRepositories() throws AppException {
    final String query = "select id, repo_url from localdb.sys_network.repositories";
    List<Repository> repo_list = new ArrayList<Repository>();
    Connection conn = null;
    PreparedStatement ps = null;
    ResultSet rs = null;
    try {
      Connection conn = DB.getConnection();
      ps = conn.prepareStatement();
      ps.execute();
      rs = ps.getResultSet();
      while (rs.next()) {
        Repository repo = new Repository();
        repo.id = rs.getInt(1);
        repo.repo_url = rs.getString(2);
        rep_list.add(repo);
      }
    } catch (SQLException e) {
      e.printStackTrace();
    } finally {
      if (conn != null) {
        DB.releaseConnection();
      }
      try {
        if (ps != null) {
          ps.close();
        }
      } catch (SQLException ex1) {
        ex1.printStackTrace();
      }
      try {
        if (rs != null) {
          rs.close();
        }
      } catch (SQLException ex2) {
        ex2.printStackTrace();
      }
    }

    RepositoryHolder ret = new RepositorHolder();
    ret.repositories = repo_list;
    return ret;
  }

Repository1.java

// pretend file is Repository.java

import java.sql.SQLException;
import java.sql.ResultSet;
// ....

@XmlAccessorType(XmlAccessType.PUBLIC_MEMBER)
@XmlRootElement(name="repository")
public class Repository extends DBLoader<Repository> {

  @XmlAttribute public int id;
  @XmlAttribute public String repo_url;

  private Repository copy;

  public void loadRow(ResultSet rs) throws SQLException {
    int c = 0;
    Repository rep = new Repository();
    rep.id = rs.getInt(++c);
    rep.repo_url = rs.getString(++c);
    copy = rep;
  }

  public void finalize() { 
  }

  public Repository copy() { return copy; }
}

Repository2.java

// pretend file is Repository.java

// ....

@XmlAccessorType(XmlAccessType.PUBLIC_MEMBER)
@XmlRootElement(name="repository")
public class Repository {

  @XmlAttribute public int id;
  @XmlAttribute public String repo_url;

}

+2 for Style 1.

+1 for Style 2. :(