Java.sql.SQLException: Operation not allowed after ResultSet closed

java.lang.NullPointerException

at com.mysql.jdbc.ResultSetImpl.setRowPositionValidity(ResultSetImpl.java:830)

at com.mysql.jdbc.ResultSetImpl.next(ResultSetImpl.java:7046)

at db.MembroDao.obterMembrosConsulta(MembroDao.java:367)

at frame.FramePrincipalCruzamentos.pesquisar(FramePrincipalCruzamentos.java:315)

at frame.FramePrincipalCruzamentos.access$0(FramePrincipalCruzamentos.java:185)

at frame.FramePrincipalCruzamentos$1.actionPerformed(FramePrincipalCruzamentos.java:450)

at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)

at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)

at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)

at javax.swing.DefaultButtonModel.setPressed(Unknown Source)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)

at java.awt.Component.processMouseEvent(Unknown Source)

at javax.swing.JComponent.processMouseEvent(Unknown Source)

at java.awt.Component.processEvent(Unknown Source)

at java.awt.Container.processEvent(Unknown Source)

at java.awt.Component.dispatchEventImpl(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)

at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)

at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Window.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)

public List obterMembrosConsulta(int idadeMinima, int idadeMaxima) throws Exception{

			Conexao conexao = new Conexao();
			List lista = new Vector();
			
			int anoAtual = Calendar.getInstance().get(Calendar.YEAR);
			int anoMin = anoAtual - idadeMaxima;
			int anoMax = anoAtual - idadeMinima;
			
			if (idadeMinima <= idadeMaxima)
			{
				String sql = "select distinct mem.mem_codigo, mem.mem_nome, fam.fam_codigo, extract(year from mem_dtnasc) as dtnasc, mem_sexo, mem_vlrenda, fam_totrenda from familia fam inner join membro mem on (fam.fam_codigo = mem.fam_codigo)";
		
				sql += " order by mem_dtnasc desc;";
				int sexo;
				int nascimento;
				int anoMemAtual;


				ResultSet rs = conexao.executeQuery(sql);
				try {
					while(rs.next()){
						Membro m = new Membro();
						Familia f = new Familia();
						f.setNumFamilia(rs.getInt("fam_codigo"));
						m.setFamilia(f);
						m.setMemNome(rs.getString("mem_nome"));
						nascimento = rs.getInt("dtnasc");
						anoMemAtual = anoAtual - nascimento;
						m.setDtNascimento(anoMemAtual);
						sexo = (rs.getInt("mem_sexo"));
						if (sexo == 1){
							m.setMemSexo("M");
						} else {
							m.setMemSexo("F");
						}

						m.setMembroRenda(rs.getFloat("mem_vlrenda"));
						f.setTotRendaFamilia(rs.getFloat("fam_totrenda"));
						lista.add(m);
				
					}
				} catch (Exception e) {
					e.printStackTrace();
				}
				return lista;
			}
			else 
			{
				lista = null;
				JOptionPane.showMessageDialog(null, "Idade Minima é Maior que Idade Maxima!");
				return lista;
			}	
			
		
		}