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私は次のWebアプリを開発しています:

  1. Glassfish v3.1.2
  2. エクリプス ジュノ SR2
  3. JPA EclipseLink2.0
  4. JSF2.0

通常のユーザーと管理者ユーザー用に異なるページのセットがあります。ログイン中にページ フィルタを設定しようとすると、ログイン Bean で次のエラーが発生します: javax.faces.FacesException: #{loginBean.login}: java.lang.NullPointerException

私のログインコード全体は、この部分がなくても機能します

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

;

ここでやろうとしているのは、ログインしているユーザーのグループ ID を取得し、それが管理者かどうかを確認することです。それに応じて、ユーザーを対応するページに誘導したいと考えています。これは、管理者ユーザーと通常ユーザーのページ セットが異なるためです。エンド ユーザーが必要としないため、Glassfish Realms を使用したくありません。

誰かが私がこれで間違っている場所を特定するのを手伝ってくれますか. （私はそのような開発を始めたばかりなので、愚かな間違いをお許しください）。よろしくお願いします！

以下は私のloginBeanのコードです

   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";
    }

}

Glassfish ログからの完全なエラー スタックは次のとおりです。

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

これが私のコントローラークラスです

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;
    }
}

以下は私のエンティティUserGroupです

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;
    }

}
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1 に答える 1

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スタック トレースを確認します。LoginBean.java の 49 行目で NPE がスローされます。

uGBDEJB アノテーションが欠落しているため、高い確率でnull になります。注入する各EJB の前に @EJB アノテーションを使用する必要があります。

@EJB
private UserDaoBean uDB;
@EJB
private UserGroupDaoBean uGDB;
...
于 2013-03-28T23:32:01.050 に答える