XMLEncoder klarer JavaBeans men ikke LinkedList i en Javabean

Jeg bruger en linkedlist til at gemme en variabel mængde sammenhørende data i en JavaBean (faktisk 3 linkedliste), når jeg så gemmer (skriver stream til disk) via XMLEncoder, får jeg denne grimme (har dog set værre *gg*) fejl:

java.lang.InstantiationException: FileLocation
Continuing ...
java.lang.Exception: discarding statement LinkedList0.add<FileLocation0>;
Continuing ...

Hrmmm.... der må jo være noget i vejen med min FileLocation-class også, så i får lige min bean-klasse samt FileLocation-class....

Først FileLocation.java (JavaBean):

public class FileLocation
{    private String fileExtension;
    private String fileLocation;
    private String description;
   
    public FileLocation(String fileExtension, String fileLocation, String description)
    {    this.fileExtension = fileExtension;
        this.fileLocation = fileLocation;
        this.description = description;
    }
   
    public String toString() { return "[."+fileExtension+"] @ "+fileLocation; }
   
    // Java-Bean getter-properties
    public String getFileExtension() { return fileExtension; }
    public String getFileLocation() { return fileLocation; }
    public String getDescription() { return description; }
   
    // Java-Bean setter-properties
    public void setFileExtension(String fileExtension) { this.fileExtension = fileExtension; }
    public void setFileLocation(String fileLocation) { this.fileLocation = fileLocation; }
    public void setDescription(String description) { this.description = description; }
}

Så Configuration.java (også JavaBean):

import java.util.*;

public class Configuration
{    private LinkedList fileLocations;
    private LinkedList grabLocations;
    private LinkedList excludeFileTypes;
    private String logFileLocation;
    private boolean saveLogToFile;

    public Configuration()
    {    fileLocations = new LinkedList();
        grabLocations = new LinkedList();
        excludeFileTypes = new LinkedList();
        excludeFileTypes.add("dat");
        excludeFileTypes.add("tmp");
        logFileLocation = "";
        saveLogToFile = false;
    }

    public void addFileLocation(FileLocation toAdd) { fileLocations.addLast(toAdd); }
    public void addGrabLocation(String path) { grabLocations.add(path); }
    public void addFileExclusion(String fileType) { excludeFileTypes.add(fileType); }
    public void removeFileLocation(int index) { fileLocations.remove(index); }
    public void removeGrabLocation(int index) { grabLocations.remove(index); }
    public void removeFileExclusion(int index) { excludeFileTypes.remove(index); }
    public Object[] getFileLocationAsArray() { return fileLocations.toArray(); }
    public Object[] getGrabLocationAsArray()
    {     Object[] toReturn = new Object[grabLocations.size()];
        for (int i = 0; i < grabLocations.size(); i++)
            toReturn[i] = (String)grabLocations.get(i);
        return toReturn;
    }
    public Object[] getExcludesAsArray()
    {     Object[] toReturn = new Object[excludeFileTypes.size()];
        for (int i = 0; i < excludeFileTypes.size(); i++)
            toReturn[i] = (String)excludeFileTypes.get(i);
        return toReturn;
    }
   
   
    // Java-Bean setter-properties
    public void setFileLocations(LinkedList fileLocations) { this.fileLocations = fileLocations; }
    public void setGrabLocations(LinkedList grabLocations) { this.grabLocations = grabLocations; }
    public void setExcludeFileTypes(LinkedList excludeFileTypes) { this.excludeFileTypes = excludeFileTypes; }
    public void setLogFileLocation(String logFileLocation) { this.logFileLocation = logFileLocation; }
    public void setSaveLogToFile(boolean saveLogToFile) { this.saveLogToFile = saveLogToFile; }
   
    // Java-Bean getter-properties
    public LinkedList getFileLocations() { return fileLocations; }
    public LinkedList getGrabLocations() { return grabLocations; }
    public LinkedList getExcludeFileTypes() { return excludeFileTypes; }
    public String getLogfileLocation() { return logFileLocation; }
    public boolean getSaveLogToFile() { return saveLogToFile; }
}