具有Hibernate标准的Nullpointer异常

Question

当我尝试从数据库中检索数据时，我收到 NullpointerException 。我在for循环中得到了异常。我认为这是一个 EventDispatchHandler 问题，但我无法解决。请有人帮帮我吗？

public class Dao {

private static final SessionFactory sessionFactory = NewHibernateUtil.getSessionFactory();

public List<OrderEntry> findAll(){
   try{
       sessionFactory.getCurrentSession().beginTransaction();
       return sessionFactory.getCurrentSession().createCriteria(OrderEntry.class).list();
   }catch(Exception e){
       return null;
   } 
}

的JFrame

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {     

    loadData();
}                                        

private void loadData() {

   DefaultTableModel dtm = new DefaultTableModel();
   dtm.addColumn("Cause");
   dtm.addColumn("Lasttname");
   dtm.addColumn("Firstname");
   for(OrderEntry oe : this.dao.findAll()){
       dtm.addRow(new Object[] {oe.getCause(), oe.getLastname(), oe.getFirstname()});
}
   jTable1.setModel(dtm);
}

public class OrderEntry  implements java.io.Serializable {


 private Integer orderid;
 private String reference;
 private String type;
 private String cause;
 private String firstname;
 private String lastname;
 private String profession;
 private Set investigationMaterials = new HashSet(0);

public OrderEntry() {
}

public OrderEntry(String reference, String type, String cause, String firstname, String lastname, String profession, Set investigationMaterials) {
   this.reference = reference;
   this.type = type;
   this.cause = cause;
   this.firstname = firstname;
   this.lastname = lastname;
   this.profession = profession;
   this.investigationMaterials = investigationMaterials;
}

public Integer getOrderid() {
    return this.orderid;
}

public void setOrderid(Integer orderid) {
    this.orderid = orderid;
}
public String getReference() {
    return this.reference;
}

public void setReference(String reference) {
    this.reference = reference;
}
public String getType() {
    return this.type;
}

public void setType(String type) {
    this.type = type;
}
public String getCause() {
    return this.cause;
}

public void setCause(String cause) {
    this.cause = cause;
}
public String getFirstname() {
    return this.firstname;
}

public void setFirstname(String firstname) {
    this.firstname = firstname;
}
public String getLastname() {
    return this.lastname;
}

public void setLastname(String lastname) {
    this.lastname = lastname;
}
public String getProfession() {
    return this.profession;
}

public void setProfession(String profession) {
    this.profession = profession;
}
public Set getInvestigationMaterials() {
    return this.investigationMaterials;
}

public void setInvestigationMaterials(Set investigationMaterials) {
    this.investigationMaterials = investigationMaterials;
}

异常

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at forensikmysql.UI.JInternalFrameShow.loadData(JInternalFrameShow.java:98)
    at forensikmysql.UI.JInternalFrameShow.jButton1ActionPerformed(JInternalFrameShow.java:89)
    at forensikmysql.UI.JInternalFrameShow.access$000(JInternalFrameShow.java:17)
    at forensikmysql.UI.JInternalFrameShow$1.actionPerformed(JInternalFrameShow.java:59)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6527)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6292)
    at java.awt.Container.processEvent(Container.java:2234)
    at java.awt.Component.dispatchEventImpl(Component.java:4883)
    at java.awt.Container.dispatchEventImpl(Container.java:2292)
    at java.awt.Component.dispatchEvent(Component.java:4705)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
    at java.awt.Container.dispatchEventImpl(Container.java:2278)
    at java.awt.Window.dispatchEventImpl(Window.java:2739)
    at java.awt.Component.dispatchEvent(Component.java:4705)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
    at java.awt.EventQueue.access$400(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:697)
    at java.awt.EventQueue$3.run(EventQueue.java:691)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.awt.EventQueue$4.run(EventQueue.java:719)
    at java.awt.EventQueue$4.run(EventQueue.java:717)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

org.hibernate.HibernateException：没有配置CurrentSessionContext！     在org.hibernate.internal.SessionFactoryImpl.getCurrentSession（SessionFactoryImpl.java:1011）     在forensikmysql.Util.Dao.findAll（Dao.java:22）     在forensikmysql.UI.JInternalFrameShow.loadData（JInternalFrameShow.java:98）     在forensikmysql.UI.JInternalFrameShow.jButton1ActionPerformed（JInternalFrameShow.java:89）     在forensikmysql.UI.JInternalFrameShow.access $ 000（JInternalFrameShow.java:17）     在forensikmysql.UI.JInternalFrameShow $ 1.actionPerformed（JInternalFrameShow.java:59）     在javax.swing.AbstractButton.fireActionPerformed（AbstractButton.java:2022）     在javax.swing.AbstractButton $ Handler.actionPerformed（AbstractButton.java:2346）     在javax.swing.DefaultButtonModel.fireActionPerformed（DefaultButtonModel.java:402）     在javax.swing.DefaultButtonModel.setPressed（DefaultButtonModel.java:259）     在javax.swing.plaf.basic.BasicButtonListener.mouseReleased（BasicButtonListener.java:252）     at java.awt.Component.processMouseEvent（Component.java:6527）     在javax.swing.JComponent.processMouseEvent（JComponent.java:3321）     at java.awt.Component.processEvent（Component.java:6292）     at java.awt.Container.processEvent（Container.java:2234）     at java.awt.Component.dispatchEventImpl（Component.java:4883）     at java.awt.Container.dispatchEventImpl（Container.java:2292）     at java.awt.Component.dispatchEvent（Component.java:4705）     at java.awt.LightweightDispatcher.retargetMouseEvent（Container.java:4898）     at java.awt.LightweightDispatcher.processMouseEvent（Container.java:4533）     at java.awt.LightweightDispatcher.dispatchEvent（Container.java:4462）     at java.awt.Container.dispatchEventImpl（Container.java:2278）     at java.awt.Window.dispatchEventImpl（Window.java:2739）     at java.awt.Component.dispatchEvent（Component.java:4705）     at java.awt.EventQueue.dispatchEventImpl（EventQueue.java:746）     at java.awt.EventQueue.access $ 400（EventQueue.java:97）     at java.awt.EventQueue $ 3.run（EventQueue.java:697）     at java.awt.EventQueue $ 3.run（EventQueue.java:691）     at java.security.AccessController.doPrivileged（Native Method）     at java.security.ProtectionDomain $ 1.doIntersectionPrivilege（ProtectionDomain.java:75）     at java.security.ProtectionDomain $ 1.doIntersectionPrivilege（ProtectionDomain.java:86）     at java.awt.EventQueue $ 4.run（EventQueue.java:719）     at java.awt.EventQueue $ 4.run（EventQueue.java:717）     at java.security.AccessController.doPrivileged（Native Method）     at java.security.ProtectionDomain $ 1.doIntersectionPrivilege（ProtectionDomain.java:75）     在java.awt.EventQueue.dispatchEvent（EventQueue.java:716）     at java.awt.EventDispatchThread.pumpOneEventForFilters（EventDispatchThread.java:201）     at java.awt.EventDispatchThread.pumpEventsForFilter（EventDispatchThread.java:116）     at java.awt.EventDispatchThread.pumpEventsForHierarchy（EventDispatchThread.java:105）     at java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:101）     at java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:93）     在java.awt.EventDispatchThread.run（EventDispatchThread.java:82）