Erro NullPointer, service não está sendo injetado

E aí pessoal, gostaria de pedir encarecidamente a ajuda de vocês pois estou há vários dias com esse problema, já tentei de tudo e não consegui dar jeito.

Tenho uma classe ManagedBean e nela utilizo um itemService para buscar todos os itens e assim carregar uma model, porém quando vou abrir a tela que puxa esse método de carregar a model, gera um erro de nullpointer exception, ao debugar percebi que o que está null é o itemService, ou seja, ele não está sendo instanciado/construído.. Peço que considerem nas respostas que eu não sou muito experiente em java, portanto se puderem explicar o que estou errando e porquê seria ótimo! Vou colar aqui o erro e as classes relacionadas e desde já agradeço a atenção de todos. A organização do projeto é a seguinte:
MB > Service > ServiceImp > DAO > DAOImp (as DAOS extendem uma GenericDAO).

(este é meu primeiro post aqui, acabei de fazer o cadastro, caso eu tenha feito alguma besteira na formatação, desculpem!! ) :slight_smile: MB:

package controller;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.ejb.EJB;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.model.DataModel;
import javax.faces.model.ListDataModel;
import javax.faces.model.SelectItem;
import javax.inject.Inject;

import dao.daoImp.ItemDAOImp;
import entity.ItemEntity;
import service.ItemService;

@SuppressWarnings("serial")
@ManagedBean(name = "itemMB")
@ViewScoped
public class ItemMB implements Serializable {


@Inject
private ItemService itemService;

	private DataModel<ItemEntity> modelItens;
	private ItemEntity item;
	private List<SelectItem> comboItens;

	@PostConstruct
	public void init() {
		item = new ItemEntity();
	}

	/* AÇÕES */
	public String salvar() {
		try {
			if (item.getIdItem() == 0) {
				itemService.salvar(item);
			} else {
				itemService.salvar(item);
			}
			System.out.println("Salvo com sucesso!");
			item = new ItemEntity();
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("Ocorreu um erro ao salvar.");
			return null;
		}
		return null;
	}

	/* NAVEGAÇÃO */
	public String cadastrar() {
		item = new ItemEntity();
		return null;
	}

	public String editar() {
		this.item = modelItens.getRowData();
		return null;
	}

	/* CARREGAR MODEL TIPO DOC */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public void carregarModelItens() {
		this.modelItens = new ListDataModel(itemService.getAllItens());
	}

	@SuppressWarnings("unchecked")
	public void carregarComboItens() {
		comboItens = new ArrayList<SelectItem>();
		
		try {
			
			List<ItemEntity> result = itemService.getAllItens();

			for (ItemEntity i : result) {
				comboItens.add(new SelectItem(i, i.getNome()));
			}

		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
	}

	public ItemService getItemService() {
		return itemService;
	}

	public void setItemService(ItemService itemService) {
		this.itemService = itemService;
	}

	public DataModel<ItemEntity> getModelItens() {
		return modelItens;
	}

	public void setModelItens(DataModel<ItemEntity> modelItens) {
		this.modelItens = modelItens;
	}

	public ItemEntity getItem() {
		return item;
	}

	public void setItem(ItemEntity item) {
		this.item = item;
	}

	public List<SelectItem> getComboItens() {
		return comboItens;
	}

	public void setComboItens(List<SelectItem> comboItens) {
		this.comboItens = comboItens;
	}
	
	

}

**Service e ServiceImp**

package service;

import java.util.List;

import entity.ItemEntity;

public interface ItemService{

	public void salvar(ItemEntity item);

	
	public void excluir(int id);

	
	@SuppressWarnings("rawtypes")
	public List getAllItens();

	
	public ItemEntity getItensById(int id);

	

}
package service.imp;

import java.util.List;

import javax.ejb.EJB;
import javax.ejb.Stateless;
import javax.inject.Inject;

import dao.ItemDAO;
import entity.ItemEntity;
import service.ItemService;

@Stateless
public class ItemServiceImp implements ItemService{

	
	@Inject
	private ItemDAO itemDAO;
	
	
	@Override
	public void salvar(ItemEntity item) {
		itemDAO.salvar(item);
	}

	@Override
	public void excluir(int id) {
		itemDAO.excluir(id);
	}

	@SuppressWarnings("rawtypes")
	@Override
	public List getAllItens() {
		return itemDAO.getAllItens();
	}

	@Override
	public ItemEntity getItensById(int id) {
		return itemDAO.getItensById(id);
	}

}

**Classes DAO e DAO IMP**

package dao;

import java.util.List;

import entity.ItemEntity;

public interface ItemDAO{

public abstract void salvar(ItemEntity item);

public abstract void excluir(int id);

public abstract List getAllItens();

public abstract ItemEntity getItensById(int id);

}

package dao.daoImp;

import java.io.Serializable;
import java.sql.Connection;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import dao.GenericDAO;

import javax.ejb.EJB;
import javax.ejb.Stateless;

import org.hibernate.exception.GenericJDBCException;

import util.ConnectionManager;
import dao.ItemDAO;
import entity.ItemEntity;

@Stateless
public class ItemDAOImp extends GenericDAOImp implements ItemDAO {

/**
*
*/
private static final long serialVersionUID = 1L;
private final static String SALVAR_ITEM = "INSERT INTO en_item (id, nome, descricao, valor) VALUES (?,?,?,?)";
private final static String DELETE_ITEM = "DELETE FROM en_item WHERE id = ?";
private final static String GET_ALL_ITENS = "SELECT * FROM en_item";
private final static String GET_ITEM_BY_ID = "SELECT * FROM en_item WHERE id = ?";

public ItemDAOImp() {

}

public void salvar(ItemEntity item) {
Connection conn = ConnectionManager.getConnection();
String sql = null;

if (item.getIdItem() == 0) {
sql = "INSERT INTO en_item (nome, descricao, valor) VALUES (?,?,?)";
} else {
sql = "UPDATE en_item SET nome = ?, descricao = ?, valor = ? WHERE id = ?";
}
try {
PreparedStatement pstmt;
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, item.getNome());
pstmt.setString(2, item.getDescricao());
pstmt.setInt(3, item.getValor());

// if (item.getIdItem() == 0)
// pstmt.setInt(4, item.getIdItem());
int resultado = pstmt.executeUpdate();

ConnectionManager.closeAll(conn, pstmt);
} catch (SQLException e) {
e.printStackTrace();
}
}

public void excluir(int id) {
Connection conn = ConnectionManager.getConnection();
String sql = null;

sql = "DELETE FROM en_item WHERE idItem = ?";

try {
PreparedStatement pstmt;
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, id);

int resultado = pstmt.executeUpdate();

ConnectionManager.closeAll(conn, pstmt);
} catch (SQLException e) {
e.printStackTrace();
}
}

@SuppressWarnings("rawtypes")
public List getAllItens() {
String sql = "SELECT * FROM en_item";
Connection conn = null;
ResultSet rs = null;
Statement stmt = null;
List itens = new ArrayList();

try {
conn = ConnectionManager.getConnection();
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
while (rs.next()) {
ItemEntity item = new ItemEntity();
item.setIdItem(rs.getInt("idItem"));
item.setNome(rs.getString("nome"));
item.setDescricao(rs.getString("descricao"));
item.setValor(rs.getInt("valor"));
itens.add(item);

}
}

catch (SQLException e) {
e.printStackTrace();
} finally {
ConnectionManager.closeAll(conn, stmt, rs);

}
return itens;
}

public ItemEntity getItensById(int id) {
// TODO Auto-generated method stub
return null;
}

}

**e por ultimo a genericDAO e genericDAOImp**

package dao;

import java.io.Serializable;
import java.util.List;

public interface GenericDAO {

public T save(T entity);

public void remove(T entity);

public void executeQuery(String query);

public T getById(Class classe, I pk);

public List getAll(Class classe);

public List getAllActive(Class classe);

public List getListOnQuery(String query);

public T getOnQuery(String query);

}

package dao.daoImp;

import java.io.Serializable;
import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;

public class GenericDAOImp implements dao.GenericDAO, Serializable {

private static final long serialVersionUID = 1L;

@PersistenceContext
protected EntityManager em;

public T save(T entity) {
T saved = null;
saved = em.merge(entity);
return saved;
}

public void remove(T entity) {
em.remove(entity);
}

public void executeQuery(String query) {
em.createQuery(query).executeUpdate();
}

public T getById(Class classe, I pk) {
return em.find(classe, pk);

}

@SuppressWarnings("unchecked")
public List getAll(Class classe) {
try {
return em.createQuery("SELECT o FROM " + classe.getSimpleName() + " o").getResultList();
} catch (NoResultException ex) {
return null;
}
}

@SuppressWarnings("unchecked")
public List getAllActive(Class classe) {
try { //Busca todos desde que estejam ativos
return em.createQuery("SELECT o FROM " + classe.getSimpleName() + " o WHERE ativo = 1").getResultList();
} catch (NoResultException ex) {
return null;
}
}

@SuppressWarnings("unchecked")
public List getListOnQuery(String query) {
try {
return em.createQuery(query).getResultList();
} catch (NoResultException ex) {
return null;
}

}

@SuppressWarnings("unchecked")
public T getOnQuery(String query) {
try {
return (T) em.createQuery(query).getSingleResult();
} catch (NoResultException ex) {
return null;
}
}

}

**EDIT: Faltou postar o erro hehe**

**Segue:**

> javax.servlet.ServletException
> javax.faces.webapp.FacesServlet.service(FacesServlet.java:606)
> org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
> root cause

> java.lang.NullPointerException
> controller.ItemMB.carregarModelItens(ItemMB.java:70)
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> java.lang.reflect.Method.invoke(Method.java:497)
> javax.el.BeanELResolver.invoke(BeanELResolver.java:183)
> javax.el.CompositeELResolver.invoke(CompositeELResolver.java:161)
> org.apache.el.parser.AstValue.getValue(AstValue.java:174)
> org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
> com.sun.faces.facelets.el.ELText$ELTextVariable.toString(ELText.java:217)
> com.sun.faces.facelets.compiler.AttributeInstruction.write(AttributeInstruction.java:89)
> com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:82)
> com.sun.faces.facelets.compiler.UILeaf.encodeAll(UILeaf.java:183)
> javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
> javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
> com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:424)
> com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:124)
> com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
> com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
> com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
> javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
> org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

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