Databas closing issue

I have a method that inserts data into my Oracle 9i database with no
problems or Database closing issues:

CODE
public class MainClass
{

public PreparedStatement preparer;
public Connection connection;

public MainClass()
{
     connection = new DbConnectionClass().getConnection();
}

public int inserter(Beann abc)
{
   int dat = 0;
   try
  {
      preparer = connection.prepareStatement("insert into abTable
(one,two) values (?,?)");
      preparer.setString(1, abc.getOne());
      preparer.setString(2, abc.getTwo());
      preparer.executeUpdate();
   }
   catch(Exception e)
  {
      e.printStackTrace();
  }
  return dat;
}

public int matcher(Beann abc)
{
     try
     {
    inserter(abc);
     }
     catch(Exception e)
     {
         e.printStackTrace();
     }
     finally
     {
        //close the ResultSet ....
        //close the Statement ....
        //close the Connection ....
     }
}

Now when I put the method (inserter) in another class called
OtherClass, it does insert the data but now I have database closing
issues:

CODE
public class OtherClass
{
....
public int inserter(Beann abc)
{
   int dat = 0;
   try
  {
      preparer = connection.prepareStatement("insert into abTable
(one,two) values (?,?)");
      preparer.setString(1, abc.getOne());
      preparer.setString(2, abc.getTwo());
      preparer.executeUpdate();
   }
   catch(Exception e)
  {
      e.printStackTrace();
  }
  return dat;
}
.....

CODE
public class MainClass
{

public PreparedStatement preparer;
public Connection connection;

public MainClass()
{
     connection = new DbConnectionClass().getConnection();
}

public int matcher(Beann abc)
{
     try
     {
         new OtherClass().insert(abc);
     }
     catch(Exception e)
     {
         e.printStackTrace();
     }
     finally
     {
        //close the ResultSet ....
        //close the Statement ....
        //close the Connection ....
     }

In Oracle SQL Plus database resource check I see JDBC Thin Client is
opened and not closed after each insert with the above attempt.
This didnt happen when I had the method in the same class.

Please advise.