我有一个问题，我创建了一个带有菜单栏的摇摆应用程序，它在菜单中有三个项目，但是当我单击一个菜单时，它挂起系统无法进入另一个菜单。只有强制关闭是最后一个选项。
下面是我的 StackTrace .. 谁能知道错误在哪里？
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.openbravo.pos.perception.Per_panel.deactivate(Per_panel.java:211)
at com.openbravo.pos.forms.JPrincipalApp.showTask(JPrincipalApp.java:344)
at com.openbravo.pos.forms.MenuPanelAction.actionPerformed(MenuPanelAction.java:47)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at org.jdesktop.swingx.JXHyperlink.fireActionPerformed(JXHyperlink.java:266)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
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:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.awt.EventQueue$3.run(EventQueue.java:686)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:702)
at java.awt.EventQueue$4.run(EventQueue.java:700)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.openbravo.pos.perception.Per_panel.deactivate(Per_panel.java:211)
at com.openbravo.pos.forms.JPrincipalApp.showTask(JPrincipalApp.java:344)
at com.openbravo.pos.forms.MenuPanelAction.actionPerformed(MenuPanelAction.java:47)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at org.jdesktop.swingx.JXHyperlink.fireActionPerformed(JXHyperlink.java:266)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
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:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.awt.EventQueue$3.run(EventQueue.java:686)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:702)
at java.awt.EventQueue$4.run(EventQueue.java:700)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
错误代码
public Per_panel() throws ClassNotFoundException {
initComponents();
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = (com.mysql.jdbc.Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/unicentadb", "root", "ubuntu123");
Statement st = con.createStatement();
ResultSet rs = st.executeQuery("Select NAME from PRODUCTS");
while (rs.next()) {
parts.addItem(rs.getString("NAME"));
}
} catch (SQLException ex) {
}
}
@Override
public void init(AppView app) throws BeanFactoryException {
this.app = app;
// m_ticketsbag = getJTicketsBag();
// m_jPanelBag.add(m_ticketsbag.getBagComponent(), BorderLayout.LINE_START);
// add(m_ticketsbag.getNullComponent(), "null");
// m_ticketlines = new JTicketLines(dlSystem.getResourceAsXML("Ticket.Line"));
// m_jPanelCentral.add(m_ticketlines, java.awt.BorderLayout.CENTER);
// m_TTP = new TicketParser(m_App.getDeviceTicket(), dlSystem);
// Los botones configurables...
// m_jbtnconfig = new JPanelButtons("Ticket.Buttons", this);
// m_jButtonsExt.add(m_jbtnconfig);
//Panel products or lines ...
// catcontainer.add(getSouthComponent(), BorderLayout.CENTER);
// Tax model
// senttax = dlSales.getTaxList();
// senttaxcategories = dlSales.getTaxCategoriesList();
// taxcategoriesmodel = new ComboBoxValModel();
// ponemos a cero el estado
// stateToZero();
// inicializamos
// m_oTicket = null;
// m_oTicketExt = null;
}
@Override
public Object getBean() {
return this;
}
@Override
public String getTitle() {
return AppLocal.getIntString("Menu.panel");
}
@Override
public void activate() throws BasicException {
//paymentdialog = JPaymentSelectCustomer.getDialog(this);
//paymentdialog.init(app);
}
@Override
public boolean deactivate() {
return m_ticketsbag.deactivate();//To change body of generated methods, choose Tools | Templates.
}
@Override
public JComponent getComponent() {
return this;
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try {
// int count = jTable1.getRowCount();
// int count1 = jTable1.getColumnCount();
Class.forName("com.mysql.jdbc.Driver");
Connection con = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/unicentadb", "root", "ubuntu123");
// running varchar date String d1 = ((JTextField) jDateChooser1.getDateEditor().getUiComponent()).getText();
//System.out.println(d1);
//ResultSet rs = null;
// String dateValue = rs.getString(1,jDateChooser1); // What ever column
// String dateValue = jDateChooser1.getDateFormatString();
// java.util.Date jd = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss").parse(dateValue);
String tf1 = perf.getText();
String tf2 = reason.getText();
String tf3 = fees.getText();
java.util.Date jd = date.getDate();
String tf5 = (String) parts.getSelectedItem();
// String tf9 = jTextField2.getText();
PreparedStatement pstmt = (PreparedStatement) con.prepareStatement("insert into MobileRep(pronumber,Reason,fees,delivery,parts) values(?,?,?,?,?)");
//running varchar date pstmt.setString(1, d1);
pstmt.setString(1, tf1);
pstmt.setString(2, tf2);
pstmt.setString(3, tf3);
pstmt.setDate(4, new java.sql.Date(jd.getTime()));
pstmt.setString(5, tf5);
// pstmt.setString(9,tf9);
pstmt.executeUpdate();
pstmt.close();
con.close();
} catch (Exception e)
{
System.out.println("Exception.." + e);
}
}
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
int i;
long value;
String output = "";
for (i = 1; i <= 1; i++) {
value = (new Date()).getTime();
//value = Math.random( );
output = output + "\t" + value + "\n";
perf.setText(output);
}
}