Question

public static Reservation[] openBinaryFile( String fileName )
{
    Reservation [] objArray = null;

    try
    { 
        ObjectInputStream inStream = new ObjectInputStream(
            new FileInputStream( fileName ) );

        objArray = (Reservation[])inStream.readObject();

        inStream.close();
    }
    catch( ClassNotFoundException e )
    {
        System.out.println( "Exception: ClassNotFoundException." );
    }

I have the class included, but why do I get an exception? The class is in the same package as the others. Why am I getting this exception?

EDIT: Here is the stack trace
run:
java.lang.ClassNotFoundException: Reservation
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:604)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1624)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at myViewer.DatabaseFile.openBinaryFile(DatabaseFile.java:42)
at myViewer.Viewer.(Viewer.java:175)
at myViewer.Viewer.main(Viewer.java:188)

Answer 1

Two things:

• Make sure that you’re actually reading Reservation[]
  • If you’re reading a subtype of Reservation (e.g. VIPReservation) then you need the binary for that type
• Make sure it’s the same exact version of Reservation

Immediate actionable:

• Diagnose the stack trace.

---

Looking at the stack trace, it expects Reservation to be located in the default package. Make sure that this is the case.