Cria tabela

Bom dia a todos!! To com o seguinte erro. Como fazer para resolver

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at br.com.sistemahemocomponentes.frames.MostraTabalaCompletaUsuarioCompleta.getRowCount(MostraTabalaCompletaUsuarioCompleta.java:51)
	at javax.swing.JTable.getRowCount(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.createTableSize(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.getPreferredSize(Unknown Source)
	at javax.swing.JComponent.getPreferredSize(Unknown Source)
	at javax.swing.ScrollPaneLayout.layoutContainer(Unknown Source)
	at java.awt.Container.layout(Unknown Source)
	at java.awt.Container.doLayout(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validate(Unknown Source)
	at java.awt.Window.show(Unknown Source)
	at java.awt.Component.show(Unknown Source)
	at java.awt.Component.setVisible(Unknown Source)
	at java.awt.Window.setVisible(Unknown Source)
	at br.com.sistemahemocomponentes.frames.SistemaHEmoComponentesUsuario$13.run(SistemaHEmoComponentesUsuario.java:671)
	at java.awt.event.InvocationEvent.dispatch(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)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at br.com.sistemahemocomponentes.frames.MostraTabalaCompletaUsuarioCompleta.getRowCount(MostraTabalaCompletaUsuarioCompleta.java:51)
	at javax.swing.JTable.getRowCount(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.createTableSize(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.getPreferredSize(Unknown Source)
	at javax.swing.JComponent.getPreferredSize(Unknown Source)
	at javax.swing.ScrollPaneLayout.layoutContainer(Unknown Source)
	at java.awt.Container.layout(Unknown Source)
	at java.awt.Container.doLayout(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validateTree(Unknown Source)
	at java.awt.Container.validate(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)

Esse e minha class que monta a tabela.

package br.com.sistemahemocomponentes.frames;

import java.awt.Color;
import java.awt.Component;
import java.util.List;

import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;

import org.apache.struts2.interceptor.BackgroundProcess;

import freemarker.core.ReturnInstruction.Return;

import br.com.sistema.hemocomponentes.dados.cliente.DadosDasBolsas;
import br.com.sistema.hemocomponentes.dados.cliente.Usuario;
/**
 *
 * @author Aquiles
 */
public class MostraTabalaCompletaUsuarioCompleta extends AbstractTableModel {
	private static final int COLUNAREGISTRO = 0;
	private static final int COLUNANOME = 1;

	private  List<Usuario> dadosusuarios;
	public MostraTabalaCompletaUsuarioCompleta(List<Usuario> usuario){
		this.dadosusuarios = usuario;
	}
	@Override
	public int getColumnCount() {
		return 2;
	}

	@Override
	public int getRowCount() {
		return dadosusuarios.size();	}
	@Override
	public String getColumnName(int column){
		if(column == COLUNAREGISTRO)return "Registro";
		if(column == COLUNANOME)return "Nome";
		
		return "";
	}
	@Override
	public Object getValueAt(int row, int column) {
		Usuario usuarios = dadosusuarios.get(row);
				
		switch (column){
		case 0:
			return usuarios.getRegistro();
		case 1:
			return usuarios.getNome();


		}
		return "";
	}
}

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