NullPointerException запросов в JSF

-1

я застрял в JSF странице входа, пожалуйста, помогите ..NullPointerException запросов в JSF

<f:view> 
    <h:messages style="color: red" 
       showDetail="true"/> 
    <h:form id="login"> 
     <h:panelGrid columns="2" border="0"> 
      Username: <h:inputText id="nip" 
         value="#{peg.nip}"/> 
      Password: <h:inputSecret id="passwd" 
          value="#{peg.passwd}"/> 
     </h:panelGrid> 
     <h:commandButton id="submit" 
         value="Login" 
         action="#{peg.login}"/> 
     <br> 
    </h:form> 

</f:view>

pegawai.java

@Entity 
@Table(name = "pegawai") 
@NamedQueries({ 
    @NamedQuery(name = "Pegawai.findAll", query = "SELECT p FROM Pegawai p"), 
    @NamedQuery(name = "Pegawai.findById", query = "SELECT p FROM Pegawai p WHERE p.id = :id"), 
    @NamedQuery(name = "Pegawai.findByOtoritasId", query = "SELECT p FROM Pegawai p WHERE p.otoritasId = :otoritasId")}) 
public class Pegawai implements Serializable { 
    private static final long serialVersionUID = 1L; 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Basic(optional = false) 
    @Column(name = "id") 
    private Integer id; 
    @Basic(optional = false) 
    @Lob 
    @Column(name = "nip") 
    private String nip; 
    @Basic(optional = false) 
    @Lob 
    @Column(name = "nama_depan") 
    private String namaDepan; 
    @Lob 
    @Column(name = "nama_tengah") 
    private String namaTengah; 
    @Lob 
    @Column(name = "nama_belakang") 
    private String namaBelakang; 
    @Basic(optional = false) 
    @Column(name = "otoritas_id") 
    private int otoritasId; 
    @Basic(optional = false) 
    @Lob 
    @Column(name = "passwd") 
    private String passwd; 
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "pegawai") 
    private Collection<Assets> assetsCollection; 
    @JoinColumn(name = "jabatan_id", referencedColumnName = "id") 
    @ManyToOne(optional = false) 
    private Jabatan jabatan; 
    @JoinColumn(name = "dept_id", referencedColumnName = "id") 
    @ManyToOne(optional = false) 
    private Department department; 

    public Pegawai() { 
    } 

    public Pegawai(Integer id) { 
     this.id = id; 
    } 

    public Pegawai(Integer id, String nip, String namaDepan, int otoritasId, String passwd) { 
     this.id = id; 
     this.nip = nip; 
     this.namaDepan = namaDepan; 
     this.otoritasId = otoritasId; 
     this.passwd = passwd; 
    } 

    public Integer getId() { 
     return id; 
    } 

    public void setId(Integer id) { 
     this.id = id; 
    } 

    public String getNip() { 
     return nip; 
    } 

    public void setNip(String nip) { 
     this.nip = nip; 
    } 

    public String getNamaDepan() { 
     return namaDepan; 
    } 

    public void setNamaDepan(String namaDepan) { 
     this.namaDepan = namaDepan; 
    } 

    public String getNamaTengah() { 
     return namaTengah; 
    } 

    public void setNamaTengah(String namaTengah) { 
     this.namaTengah = namaTengah; 
    } 

    public String getNamaBelakang() { 
     return namaBelakang; 
    } 

    public void setNamaBelakang(String namaBelakang) { 
     this.namaBelakang = namaBelakang; 
    } 

    public int getOtoritasId() { 
     return otoritasId; 
    } 

    public void setOtoritasId(int otoritasId) { 
     this.otoritasId = otoritasId; 
    } 

    public String getPasswd() { 
     return passwd; 
    } 

    public void setPasswd(String passwd) { 
     this.passwd = passwd; 
    } 

    public Collection<Assets> getAssetsCollection() { 
     return assetsCollection; 
    } 

    public void setAssetsCollection(Collection<Assets> assetsCollection) { 
     this.assetsCollection = assetsCollection; 
    } 

    public Jabatan getJabatan() { 
     return jabatan; 
    } 

    public void setJabatan(Jabatan jabatan) { 
     this.jabatan = jabatan; 
    } 

    public Department getDepartment() { 
     return department; 
    } 

    public void setDepartment(Department department) { 
     this.department = department; 
    } 

    @Override 
    public int hashCode() { 
     int hash = 0; 
     hash += (id != null ? id.hashCode() : 0); 
     return hash; 
    } 

    @Override 
    public boolean equals(Object object) { 
     // TODO: Warning - this method won't work in the case the id fields are not set 
     if (!(object instanceof Pegawai)) { 
      return false; 
     } 
     Pegawai other = (Pegawai) object; 
     if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) { 
      return false; 
     } 
     return true; 
    } 

    @Override 
    public String toString() { 
     return "Assets.Entities.Pegawai[id=" + id + "]"; 
    }

pegawaimanager.java

public class PegawaiManager{ 
    private Integer id; 
    @PersistenceContext 
    private EntityManager em; 

    private Department department; 
    private String nip; 
    private String namaDepan; 
    private String namaTengah; 
    private String namaBelakang; 
    private int otoritasId; 
    private String passwd; 
    private Jabatan jabatan; 
    private Collection<Assets> assetsCollection; 

    public Integer getId() { 
     return id; 
    } 

    public void setId(Integer id) { 
     this.id = id; 
    } 

    public String getNip() { 
     return nip; 
    } 

    public void setNip(String nip) { 
     this.nip = nip; 
    } 

    public String getNamaDepan() { 
     return namaDepan; 
    } 

    public void setNamaDepan(String namaDepan) { 
     this.namaDepan = namaDepan; 
    } 

    public String getNamaTengah() { 
     return namaTengah; 
    } 

    public void setNamaTengah(String namaTengah) { 
     this.namaTengah = namaTengah; 
    } 

    public String getNamaBelakang() { 
     return namaBelakang; 
    } 

    public void setNamaBelakang(String namaBelakang) { 
     this.namaBelakang = namaBelakang; 
    } 

    public int getOtoritasId() { 
     return otoritasId; 
    } 

    public void setOtoritasId(int otoritasId) { 
     this.otoritasId = otoritasId; 
    } 

    public String getPasswd() { 
     return passwd; 
    } 

    public void setPasswd(String passwd) { 
     this.passwd = passwd; 
    } 

    public Collection<Assets> getAssetsCollection() { 
     return assetsCollection; 
    } 

    public void setAssetsCollection(Collection<Assets> assetsCollection) { 
     this.assetsCollection = assetsCollection; 
    } 

    public Jabatan getJabatan() { 
     return jabatan; 
    } 

    public void setJabatan(Jabatan jabatan) { 
     this.jabatan = jabatan; 
    } 

    public Department getDepartment() { 
     return department; 
    } 

    public void setDepartment(Department department) { 
     this.department = department; 
    } 

    public String login() 
    { 
      Pegawai q = (Pegawai) em.createQuery("SELECT p FROM Pegawai p").getSingleResult(); 

      //Query q = em.createQuery("select object(p) from Pegawai as p"); 
      /*if(!q.isEmpty()){ 
       return "app-main"; 
      }else{ 
       return "app-error"; 
      }*/ 
      //em.close(); 
      return "app-main"; 
    }

и этот face-config.xml

<navigation-rule> 
     <from-view-id>/login.jsp</from-view-id> 
     <navigation-case> 
      <from-outcome>app-main</from-outcome> 
      <to-view-id>/index.jsp</to-view-id> 
     </navigation-case> 
     <navigation-case> 
      <from-outcome>app-error</from-outcome> 
      <to-view-id>/error.jsp</to-view-id> 
     </navigation-case> 
    </navigation-rule> 
    <managed-bean> 
     <managed-bean-name>peg</managed-bean-name> 
     <managed-bean-class>Assets.Entities.PegawaiManager</managed-bean-class> 
     <managed-bean-scope>session</managed-bean-scope> 
    </managed-bean>

web.xml

<context-param> 
     <param-name>javax.faces.PROJECT_STAGE</param-name> 
     <param-value>Development</param-value> 
    </context-param> 
    <servlet> 
     <servlet-name>Faces Servlet</servlet-name> 
     <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> 
     <load-on-startup>1</load-on-startup> 
    </servlet> 
    <servlet-mapping> 
     <servlet-name>Faces Servlet</servlet-name> 
     <url-pattern>/faces/*</url-pattern> 
    </servlet-mapping> 
    <session-config> 
     <session-timeout> 
      30 
     </session-timeout> 
    </session-config> 
    <welcome-file-list> 
     <welcome-file>faces/login.jsp</welcome-file> 
    </welcome-file-list>

, когда я ударил кнопку входа, исключение в странице

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) 
    at javax.faces.component.UICommand.broadcast(UICommand.java:315) 
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:775) 
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1267) 
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82) 
    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:312) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
    at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859) 
    at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579) 
    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555) 
    at java.lang.Thread.run(Thread.java:662) 
Caused by: java.lang.NullPointerException 
    at Assets.Entities.PegawaiManager.login(PegawaiManager.java:114) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.el.parser.AstValue.invoke(AstValue.java:191) 
    at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276) 
    at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:68) 
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)

пожалуйста, помогите, почему всегда исключение, когда я сделал метод запроса? i развернута с apache tomcat и mysql, соединитель mysql добавлен в папку библиотеки

источник

2012-04-17 Igi Shellshock

Убедитесь, что вы не создаете экземпляр 'EntityManager' вручную, так, что бы сделать инъекцию, чтобы не работать. Редактировать: Где вы создаете экземпляр своего 'PegawaiManager'? –

в этом случае, как создать экземпляр EntityManager? Мне жаль, что я новичок в JSF и java..Пожалуйста, помогите @RaulGogo –

Ошибка Assets.Entities.PegawaiManager.login(PegawaiManager.java:114).

Единственное заявление в методе авторизации является Pegawai q = (Pegawai) em.createQuery("SELECT p FROM Pegawai p").getSingleResult();

Убедитесь, что «их» не NULL.

источник

2012-04-17 07:18:10

, как установить 'em' не null? извините, я новичок в jsf и java, я узнал из учебника и образца. Спасибо @Hardik Mishra –

См. мой ответ выше. –

-1

Вы должны попробовать ввести EntityManagerFactory, а затем создать из него EntityManager.

@PersistenceUnit 
EntityManagerFactory emf;

Затем получить EntityManager из EntityManagerFactory Например:

EntityManager em = emf.createEntityManager();

источник

2012-04-17 07:27:27

@PersistenceUnit EntityManagerFactory emf; EntityManager em = emf.createEntityManager(); Pegawai q = (Pegawai) em.createQuery ("SELECT p FROM Pegawai p"). GetSingleResult(); но все же исключение .. –

public PegawaiManager(){ emf = Persistence.createEntityManagerFactory("ProjectAssetsPU"); em = emf.createEntityManager(); } public String login() { Pegawai q = (Pegawai) em.createQuery("SELECT p FROM Pegawai p").getResultList(); return "app-main"; } и за исключением java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager: Exception Description: Error compiling the query [SELECT p FROM Pegawai p]. Unknown entity type [Pegawai]. –

Ваше имя таблицы '@Table (name =" pegawai ")'. Попробуйте установить его на заглавную букву: '@Table (name =" Pegawai ")' –

NullPointerException запросов в JSF

ответ

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