Loading ArrayList of Objects from file

[salaavoisuani]

I've been trying to work out saving and loading objects in Java, but I'm having some problems with the loading of the file. What I want to do here is load an ArrayList of objects called Employee, which I have serialized. I'm still getting a red wall of errors when I try to load it. What am I doing wrong? Here is my code:\[code\]try (FileInputStream filStrom = new FileInputStream(filpeker); ObjectInputStream objektStrom = new ObjectInputStream(filStrom)) { employeelist = (ArrayList<Employee>)objektStrom.readObject(); objektStrom.close(); } catch (IOException | ClassNotFoundException e) { JOptionPane.showMessageDialog(null, "Feil under lesing av fil! " + e.getMessage()); e.printStackTrace(); } \[/code\]The errors I'm getting are these:\[code\]java.io.InvalidClassException: ovinger9.Employee; no valid constructorat java.ibjectStreamClass$ExceptionInfo.newInvalidClassException(Unknown Source)at java.ibjectStreamClass.checkDeserialize(Unknown Source)at java.ibjectInputStream.readOrdinaryObject(Unknown Source)at java.ibjectInputStream.readObject0(Unknown Source)at java.ibjectInputStream.readObject(Unknown Source)at java.util.ArrayList.readObject(Unknown Source)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at java.ibjectStreamClass.invokeReadObject(Unknown Source)at java.ibjectInputStream.readSerialData(Unknown Source)at java.ibjectInputStream.readOrdinaryObject(Unknown Source)at java.ibjectInputStream.readObject0(Unknown Source)at java.ibjectInputStream.readObject(Unknown Source)at ovinger9.EmployeeGUI$2.actionPerformed(EmployeeGUI.java:135)at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)at javax.swing.DefaultButtonModel.setPressed(Unknown Source)at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)at java.awt.Component.processMouseEvent(Unknown Source)at javax.swing.JComponent.processMouseEvent(Unknown Source)at java.awt.Component.processEvent(Unknown Source)at java.awt.Container.processEvent(Unknown Source)at java.awt.Component.dispatchEventImpl(Unknown Source)at java.awt.Container.dispatchEventImpl(Unknown Source)at java.awt.Component.dispatchEvent(Unknown Source)at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)at java.awt.Container.dispatchEventImpl(Unknown Source)at java.awt.Window.dispatchEventImpl(Unknown Source)at java.awt.Component.dispatchEvent(Unknown Source)at java.awt.EventQueue.dispatchEventImpl(Unknown Source)at java.awt.EventQueue.access$200(Unknown Source)at java.awt.EventQueue$3.run(Unknown Source)at java.awt.EventQueue$3.run(Unknown Source)at java.security.AccessController.doPrivileged(Native Method)at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)at java.awt.EventQueue$4.run(Unknown Source)at java.awt.EventQueue$4.run(Unknown Source)at java.security.AccessController.doPrivileged(Native Method)at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)at java.awt.EventQueue.dispatchEvent(Unknown Source)at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)at java.awt.EventDispatchThread.pumpEvents(Unknown Source)at java.awt.EventDispatchThread.pumpEvents(Unknown Source)at java.awt.EventDispatchThread.run(Unknown Source)\[/code\]