Immer javax.Gesichter.FacesException: java.lang.NullPointerException

Ich bin der Entwicklung einer Web-App mit folgenden :

1. Glassfish v3.1.2
2. Eclipse Juno SR2
3. JPA EclipseLink2.0
4. JSF 2.0

Habe ich verschiedene Seiten für die normalen user und für den admin-Benutzer. Beim Versuch das setup eine Seite filter beim login bekomme ich diese Fehler in meinem login-bean : javax.Gesichter.FacesException: #{loginBean.login}: java.lang.NullPointerException

Meine ganze login-code funktioniert auch ohne dieses Teil

if (uGDB.validateGroup(username, adminGroup)) {
                return "home.jsf?faces-redirect=true&includeViewParams=true";
            }
            return "normalHome.jsf?faces-redirect=true&includeViewParams=true"

;

Was ich versuche, hier zu tun ist, um die Gruppen-Id des Benutzers, der sich anmelden und überprüfen, ob er admin ist oder nicht. Und dementsprechend will ich weisen Sie den Benutzer auf die entsprechende Seite. Dies ist, weil ich verschiedene Seiten für den admin-Benutzer und normale Benutzer. Ich don ' T wollen, verwenden Sie die Glassfish-Realms, da die Endnutzer nicht benötigen.

Kann jemand bitte mir helfen identifizieren, wohin ich gehe falsch. (Entschuldigen Sie mich bitte für dumme Fehler ich bin gerade erst mit einer solchen Entwicklung). Vielen Dank im Voraus!

Unten ist der code für meine loginBean

   package beans;

import java.io.Serializable;

import javax.ejb.EJB;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.context.FacesContext;

import ejb.UserDaoBean;
import ejb.UserGroupDaoBean;

import model.User;

@ManagedBean(name = "loginBean")
@RequestScoped
public class LoginBean implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @EJB
    private UserDaoBean uDB;
    private UserGroupDaoBean uGDB;
    private User userId;

    private int adminGroup = 1;

    private String username;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String login() {
        FacesContext context = FacesContext.getCurrentInstance();

        if (uDB.validateUser(username)) {
            userId = uDB.findUser(username);

            context.getExternalContext().getSessionMap().put("userId", userId);
            if (uGDB.validateGroup(username, adminGroup)) {
                return "home.jsf?faces-redirect=true&includeViewParams=true";
            }
            return "normalHome.jsf?faces-redirect=true&includeViewParams=true";

        } else {
            FacesMessage message = new FacesMessage();
            message.setSeverity(FacesMessage.SEVERITY_ERROR);
            message.setSummary("Username doesn't exists! OR User is trying to login from someone else's account");
            context.addMessage("", message);
            return null;
        }
    }

    public String logout() {
        FacesContext.getCurrentInstance().getExternalContext()
                .invalidateSession();
        return "logout.jsf?faces-redirect=true";
    }

}

Hier der komplette Fehler-stack von Glassfish log

WARNING: #{loginBean.login}: java.lang.NullPointerException
javax.faces.FacesException: #{loginBean.login}: java.lang.NullPointerException
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)
Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    ... 31 more
Caused by: java.lang.NullPointerException
    at beans.LoginBean.login(LoginBean.java:49)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:254)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 32 more

Hier meine controller-Klasse

package ejb;

import java.util.List;

import javax.ejb.LocalBean;
import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.Query;

import javax.persistence.PersistenceContext;

import model.Group;
import model.User;
import model.UserGroup;

@Stateful
@LocalBean
public class UserGroupDaoBean {
    @PersistenceContext(unitName = "myPU")
    private EntityManager entityManager;

    public UserGroupDaoBean() {

    }

    public UserGroup createNewUserGroup(int groupId, String username) {

        UserGroup newUserGrp = new UserGroup();

        User myUsr;
        myUsr = entityManager.find(User.class, username);
        newUserGrp.setUser(myUsr);

        Group myGrp;
        myGrp = entityManager.find(Group.class, groupId);
        newUserGrp.setGroup(myGrp);

        saveNewUsrGrp(newUserGrp);
        return newUserGrp;
    }

    private void saveNewUsrGrp(UserGroup usrGrp) {
        entityManager.persist(usrGrp);
        entityManager.flush();
    }

    public boolean checkUsertoGroup(String username, int groupId) {

        Group chkGrp;
        chkGrp = entityManager.find(Group.class, groupId);

        User chkUsr;
        chkUsr = entityManager.find(User.class, username);

        if (chkGrp != null) {

            if (chkUsr != null) {

                try {
                    entityManager.createNamedQuery("findGroupsbyUser")
                            .setParameter("username", chkUsr)
                            .setParameter("groupId", chkGrp).getSingleResult();
                    System.out.println("UserGroup already exists");
                    return false;
                } catch (NoResultException e) {
                    return true;
                }

            }
            System.out.println("User doesn't exist");
            return false;
        }
        System.out.println("Group doesn't exist");

        return false;

    }

    public void deleteUserGroup(UserGroup userGroup) {
        userGroup = entityManager.merge(userGroup);
        entityManager.remove(userGroup);
    }

    public UserGroup update(UserGroup myUserGroup) {
        return entityManager.merge(myUserGroup);
    }

    @SuppressWarnings("unchecked")
    public List<UserGroup> getAllUserGroups() {

        try {
            Query query = entityManager.createNamedQuery("findAllUserGroup");
            List<UserGroup> result = (List<UserGroup>) query.getResultList();
            return result;

        } catch (NoResultException e) {
            System.out.println("No Result found");
            return null;
        }
    }

    public boolean validateGroup(String username, int groupId) {

        try {
            UserGroup myGroupId = (UserGroup) entityManager
                    .createNamedQuery("findGroup")
                    .setParameter("username", username)
                    .setParameter("groupId", groupId).getSingleResult();

            if (myGroupId != null) {
                System.out.println("This user is admin!!!");
                return true;
            }

        } catch (NoResultException e) {
            return false;
        }

        System.out.println("This user is not admin");
        return false;
    }
}

Unten ist mein Entität UserGroup

package model;

import java.io.Serializable;
import javax.persistence.*;


/**
 * The persistent class for the UserGroup database table.
 * 
 */
@NamedQueries({

    @NamedQuery(name = "findGroupsbyUser", query = "Select ug.group from UserGroup ug where ug.user=:username AND ug.group=:groupId"),

    @NamedQuery(name = "findAllUserGroup", query="Select ug from UserGroup ug"),

    @NamedQuery(name = "findAdminGroupId", query = "Select ug from UserGroup ug where ug.user=:username AND ug.group=:groupId"),


})
@Entity
@Table(name="usergroup")
public class UserGroup implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="RowId" )
    private int rowId;

    //bi-directional many-to-one association to Group
    @ManyToOne
    @JoinColumn(name="groupId")
    private Group group;

    //bi-directional many-to-one association to User
    @ManyToOne
    @JoinColumn(name="username")
    private User user;

    public UserGroup() {
    }

    public int getRowId() {
        return this.rowId;
    }

    public void setRowId(int rowId) {
        this.rowId = rowId;
    }

    public Group getGroup() {
        return this.group;
    }

    public void setGroup(Group group) {
        this.group = group;
    }

    public User getUser() {
        return this.user;
    }

    public void setUser(User user) {
        this.user = user;
    }

}

InformationsquelleAutor sup | 2013-03-28