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EJB reference always null.Jboss 6
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created by <a href="https://community.jboss.org/people/rfe.cook">Andrei Karzhou</a> in <i>EJB3 Development</i> - <a href="https://community.jboss.org/message/826801#826801">View the full discussion</a>
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<div class="jive-rendered-content"><p>I am deleveloping web project EJB,JPA - Hibernate as provider, JBoss 6,MySql.</p><p>I new in EJB, JPA.I have problems with load ejb bean in servlet.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>**persistence.xml**</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><?xml version="1.0" encoding="UTF-8"?></p><p><span><persistence xmlns="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/persistence</a><span>" version="2.0"></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    <persistence-unit name="LibraryPersistenceUnit" transaction-type="JTA"></p><p>        <provider>org.hibernate.ejb.HibernatePersistence</provider></p><p>        <jta-data-source>java:/MySqlDS</jta-data-source></p><p>        <class>library.entity.User</class></p><p>        <class>library.entity.Book</class></p><p>        <properties></p><p>            <property name="hibernate.show_sql" value="true" /></p><p>            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/></p><p>        </properties></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    </persistence-unit></p><p></persistence></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>**UserFacade.java**</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @Local</p><p>    public interface UserFacade {</p><p>        User findUserByLoginAndPassword(String login, String password);</p><p>    </p><p>       /* List<User> getClients();</p><p>    </p><p>        void returnBooks(long userId, long[] ids);</p><p>    </p><p>        void takeBooks(long userId, long[] ids);*/</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>**UserFacadeImpl.java**</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    package library.facades.impl;</p><p>    </p><p>    import library.dao.impl.UserDAO;</p><p>    import library.entity.User;</p><p>    import library.facades.interfaces.UserFacade;</p><p>    </p><p>    import javax.ejb.EJB;</p><p>    import javax.ejb.Stateless;</p><p>    </p><p>    @Stateless</p><p>    public class UserFacadeImpl implements UserFacade {</p><p>    </p><p>        @EJB</p><p>        private UserDAO userDAO;</p><p>    </p><p>        public UserFacadeImpl() {</p><p>        }</p><p>    </p><p>        public User findUserByLoginAndPassword(String login, String password) {</p><p>            User user = userDAO.selectUserByLoginAndPassword(login, password);</p><p>            return user;</p><p>        }</p><p>    </p><p>     /*   public List<User> getListClients() {</p><p>            List<User> userList = userDAO.getClients();</p><p>            return userList;</p><p>        }</p><p>    </p><p>        public void returnBooks(long userId, long[] ids) {</p><p>            userDAO.returnBooks(userId, ids);</p><p>        }</p><p>    </p><p>        public void takeBooks(long userId, long[] ids) {</p><p>            userDAO.takeBooks(userId, ids);</p><p>        }*/</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>**UserDAO.java** </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    package library.dao.impl;</p><p>    </p><p>    </p><p>    import library.dao.interfaces.GenericDAO;</p><p>    import library.entity.User;</p><p>    </p><p>    import javax.ejb.Local;</p><p>    import javax.ejb.Stateless;</p><p>    import java.util.HashMap;</p><p>    import java.util.Map;</p><p>    </p><p>    </p><p>    @Stateless</p><p>    public class UserDAO extends GenericDAO {</p><p>    </p><p>    </p><p>        public UserDAO() {</p><p>            super(User.class);</p><p>        }</p><p>    </p><p>        public User selectUserByLoginAndPassword(String login, String password) {</p><p>            Map<String, Object> parameters = new HashMap<String, Object>();</p><p>            parameters.put("login", login);</p><p>            parameters.put("password", password);</p><p>            return (User) super.findOneResult(User.SELECT_USER_BY_LOGIN_AND_PASSWORD, parameters);</p><p>        }</p><p>    </p><p>        /*public List<User> getClients() {</p><p>            Query namedQuery = entityManager.createNamedQuery(User.ALL_CLIENTS, User.class);</p><p>            List<User> clientsList = namedQuery.getResultList();</p><p>            return clientsList;</p><p>        }</p><p>    </p><p>        @Override</p><p>        public void returnBooks(long userId, long[] ids) {</p><p>            User user = entityManager.find(User.class, userId);</p><p>            for (long id : ids) {</p><p>                Book book = entityManager.find(Book.class, id);</p><p>                user.getTakenBooks().remove(book);</p><p>            }</p><p>            entityManager.merge(user);</p><p>        }</p><p>    </p><p>        @Override</p><p>        public void takeBooks(long userId, long[] ids) {</p><p>            User user = entityManager.find(User.class, userId);</p><p>            for (long id : ids) {</p><p>                Book book = entityManager.find(Book.class, id);</p><p>                user.getTakenBooks().add(book);</p><p>            }</p><p>            entityManager.merge(user);</p><p>        }*/</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>**GenericDAO.java**</p><p>    package library.dao.interfaces;</p><p>    </p><p>    import javax.persistence.EntityManager;</p><p>    import javax.persistence.PersistenceContext;</p><p>    import javax.persistence.Query;</p><p>    import java.util.List;</p><p>    import java.util.Map;</p><p>    </p><p>    public abstract class GenericDAO<T> {</p><p>        private static final String LIBRARY_PERSISTENCE_UNIT = "LibraryPersistenceUnit";</p><p>    </p><p>        @PersistenceContext(unitName = LIBRARY_PERSISTENCE_UNIT)</p><p>        private EntityManager entityManager;</p><p>    </p><p>        private Class<T> entityClass;</p><p>    </p><p>        public GenericDAO() {</p><p>        }</p><p>    </p><p>        public GenericDAO(Class<T> entityClass) {</p><p>            this.entityClass = entityClass;</p><p>        }</p><p>    </p><p>        public void save(T entity) {</p><p>            entityManager.persist(entity);</p><p>        }</p><p>    </p><p>        protected void delete(Object id, Class<T> classe) {</p><p>            T entityToBeRemoved = entityManager.getReference(classe, id);</p><p>            entityManager.remove(entityToBeRemoved);</p><p>        }</p><p>    </p><p>        public T update(T entity) {</p><p>            return entityManager.merge(entity);</p><p>        }</p><p>    </p><p>        public T find(int entityID) {</p><p>            return entityManager.find(entityClass, entityID);</p><p>        }</p><p>    </p><p>        // Using the unchecked because JPA does not have a</p><p>        // entityManager.getCriteriaBuilder().createQuery()<T> method</p><p>        @SuppressWarnings({"unchecked", "rawtypes"})</p><p>        public List<T> findAll() {</p><p>           /* CriteriaQuery cq = entityManager.getCriteriaBuilder().createQuery();</p><p>            cq.select(cq.from(entityClass));*/</p><p>            return null;//entityManager.createQuery(cq).getResultList();</p><p>        }</p><p>    </p><p>        // Using the unchecked because JPA does not have a</p><p>        // ery.getSingleResult()<T> method</p><p>        @SuppressWarnings("unchecked")</p><p>        protected T findOneResult(String namedQuery, Map<String, Object> parameters) {</p><p>            T result = null;</p><p>    </p><p>            try {</p><p>                Query query = entityManager.createNamedQuery(namedQuery);</p><p>    </p><p>                // Method that will populate parameters if they are passed not null and empty</p><p>                if (parameters != null && !parameters.isEmpty()) {</p><p>                    populateQueryParameters(query, parameters);</p><p>                }</p><p>    </p><p>                result = (T) query.getSingleResult();</p><p>    </p><p>            } catch (Exception e) {</p><p>                System.out.println("Error while running query: " + e.getMessage());</p><p>                e.printStackTrace();</p><p>            }</p><p>    </p><p>            return result;</p><p>        }</p><p>    </p><p>        private void populateQueryParameters(Query query, Map<String, Object> parameters) {</p><p>    </p><p>            for (Map.Entry<String, Object> entry : parameters.entrySet()) {</p><p>                query.setParameter(entry.getKey(), entry.getValue());</p><p>            }</p><p>        }</p><p>    </p><p>        public EntityManager getEntityManager() {</p><p>            return entityManager;</p><p>        }</p><p>    </p><p>        public void setEntityManager(EntityManager entityManager) {</p><p>            this.entityManager = entityManager;</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>**LibraryController**</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    package library.controller;</p><p>    </p><p>    import library.entity.User;</p><p>    import library.facades.interfaces.UserFacade;</p><p>    import library.resourses.constants.Constants;</p><p>    import library.resourses.enums.Role;</p><p>    </p><p>    import javax.ejb.EJB;</p><p>    import javax.servlet.RequestDispatcher;</p><p>    import javax.servlet.ServletException;</p><p>    import javax.servlet.http.HttpServlet;</p><p>    import javax.servlet.http.HttpServletRequest;</p><p>    import javax.servlet.http.HttpServletResponse;</p><p>    import java.io.IOException;</p><p>    </p><p>    </p><p>    public class LibraryController extends HttpServlet {</p><p>    </p><p>        @EJB</p><p>        private UserFacade userFacade;</p><p>    </p><p>        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws javax.servlet.ServletException, IOException {</p><p>            performAction(request, response);</p><p>        }</p><p>    </p><p>        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws javax.servlet.ServletException, IOException {</p><p>            performAction(request, response);</p><p>        }</p><p>    </p><p>        private void performAction(HttpServletRequest request, HttpServletResponse response) {</p><p>            String pageType = request.getParameter(Constants.PAGE_TYPE);</p><p>            if (pageType != null) {</p><p>                try {</p><p>                    String page = null;</p><p>                    String login = request.getParameter(Constants.USER_LOGIN);</p><p>                    String password = request.getParameter(Constants.USER_PASSWORD);</p><p>                    User user = userFacade.findUserByLoginAndPassword(login, password);</p><p>                    if (user == null) {</p><p>                        request.getSession().setAttribute(Constants.ERROR,</p><p>                                Constants.ERROR_MESSAGE_7);</p><p>                        page = Constants.MAIN_PAGE;</p><p>                    } else {</p><p>                        String namePage = user.getRole().toString().toLowerCase();</p><p>                        if (isClient(user)) {</p><p>                            request.getSession().setAttribute(Constants.CLIENT,</p><p>                                    user);</p><p>                            request.getSession().setAttribute(Constants.ERROR, null);</p><p>                        } else if (isAdministrator(user)) {</p><p>                            request.getSession().setAttribute(Constants.ADMINISTRATOR,</p><p>                                    user);</p><p>                            request.getSession().setAttribute(Constants.ERROR, null);</p><p>                        }</p><p>                        page = Constants.START_PAGES + namePage + Constants.END_PAGES;</p><p>                    }</p><p>                    RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher(page);</p><p>                    requestDispatcher.forward(request, response);</p><p>                } catch (ServletException e) {</p><p>                    e.printStackTrace();</p><p>                } catch (IOException e) {</p><p>                    e.printStackTrace();</p><p>                }</p><p>            }</p><p>        }</p><p>    </p><p>        private boolean isAdministrator(User user) {</p><p>            return user.getRole().equals(Role.ADMINISTRATOR);</p><p>        }</p><p>    </p><p>        private boolean isClient(User user) {</p><p>            return user.getRole().equals(Role.CLIENT);</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I get null for userFacade.Can you explain me what I do wrong.</p><p>Thanks.</p></div>
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