Json-lib / Discussion / Help: Why does serialization skip this attribute?

This is absolutely driving me nuts. I had this all working the other day, then broke something. Spent yesterday thinking I knew what it was and trying to track it down in vain. Here is the JSON string generated:

{"editingAllowed":true,"groupIdList":[1004,1003],"iconImagePath":"/static/img/casualtysource.gif","iconTypeName":"CASUALTY_SOURCE","id":1039,"locationInfoList":[{"day":0,"name":"START"}],"name":"CS1","notes":""}

There is an IconInfo object that contains a list of 0 or more IconLocationInfo objects (location of the icon by day), each of which should contain a LatLonInfo object.

The problem is that the LatLonInfo object is not being serialized into JSON. Can anyone give me a hint why? I'm sure the latLonInfo attribute is being set, as I have dumped it out. There are no exceptions on the console.

Here are the classes (I've omitted IconInfo and deleted the equals/hashcode methods for brevity):

public class IconLocationInfoImpl implements IconLocationInfo {

    private String name = null;
    private Integer day = null;
    private LatLonInfo latLonInfo = new LatLonInfoImpl();


    public String getName() {
        return this.name;
    }

    public void setName(String newValue) {
        this.name = newValue;
    }

    public Integer getDay() {
        if (this.day == null)
            return 0;
        else
            return this.day;
    }

    public void setDay(Integer newValue) {
        this.day = newValue;
    }

    public LatLonInfo getLatLonInfo() {
        return this.latLonInfo;
    }

    public void setLatLonInfo(LatLonInfo newValue) {
        this.latLonInfo = newValue;
    }

    /**
     * Returns true if the IconLocationInfo object has a location set.
     */
    public boolean latLonEntered() {
        return (this.latLon != null) && this.latLon.latLonEntered();
    }

    public IconLocationInfo cloneCommon() {
        IconLocationInfoImpl clone = new IconLocationInfoImpl();
        clone.setName(this.getName());
        clone.setDay(this.getDay());
        clone.setLatLonInfo(this.getLatLonInfo());
        return null;
    }


    /**
     * toString
     * @return String a string representation of the IconLocationInfoImpl object.
     */
    public String toString() {
        return new StringBuffer("IconLocationInfoImpl: ")
        .append("Name(").append(this.getName()).append("), ")
        .append("Day(").append(this.getDay()).append("), ")
        .append(this.getLatLonInfo())
        .toString();
    }

} // IconLocationInfoImpl

public class LatLonInfoImpl implements LatLonInfo {

    public final static LatLonInfo NO_LOCATION = new LatLonInfoImpl(null, null);

    private String latitude;            // this is the unit's current latitude
    private String longitude;            // this is the unit's current longitude


    /**
     * Default constructor for an empty LatLonImpl object.
     */
    public LatLonInfoImpl() {
    }

    /**
     * Construct a LatLonImpl using the latitude and longitude
     * passed in as Strings. Note that no validation is performed
     * (at present) to determine whether or not these are valid
     * latitude and longitude coordinates.
     *
     * @param latitude
     * @param longitude
     */
    public LatLonInfoImpl(String latitude, String longitude) {
        this();
        this.setLatitude(latitude);
        this.setLongitude(longitude);
    }

    /**
     * Returns the latitude coordinate as a String.
     * @return String representing the Latitude
     */
    public String getLatitude() {
        return this.latitude;
    }

    /**
     * Sets the longitude of the LatLon
     * @param newValue
     */
    public void setLatitude(String newValue) {
        this.latitude = newValue;
    }

    /**
     * Returns the longitude coordinate as a String.
     * @return String that represents the Longitude
     */
    public String getLongitude() {
        return this.longitude;
    }

    /**
     * Sets the longitude of the LatLon
     * @param newValue
     */
    public void setLongitude(String newValue) {
        this.longitude = newValue;
    }
    /**
     * Returns a boolean flag indicating whether or not
     * the LatLon object defines a valid set of coordinates.
     *
     * @return
     */
    public boolean latLonEntered() {
        return (this.latitude != null)&&(this.longitude != null);
    }

    /**
     * Returns the latitude as a Double object.
     *
     * @return Double the latitude as a numeric Double object, null if not defined.
     */
    public Double fetchDoubleLat() {
        if (this.getLatitude()==null) return null;
        Double lat = null;
        try {
            lat = Double.parseDouble(this.latitude);
        } catch (java.lang.NumberFormatException nfe) {
            lat = Double.NaN;
        }
        return lat;
    } // getDoubleLat

    /**
     * Returns the longitude as a Double object.
     *
     * @return Double the longitude as a numeric Double object, null if not defined.
     */
    public Double fetchDoubleLon() {
        if (this.getLongitude()==null) return null;
        Double lon = null;
        try {
            lon = Double.parseDouble(this.longitude);
        } catch (java.lang.NumberFormatException nfe) {
            lon = Double.NaN;
        }
        return lon;
    }


    /**
     * The toString method returns a String of the format
     * Location: day(x) name(xxxx) lat(xx.xxx) lon(xxx.xxxx)
     */
    public String toString() {
        return new StringBuffer("Lat/Lon: (")
            .append(this.getLatitude())
            .append("/")
            .append(this.getLongitude())
            .append(")")
            .toString();
    } // toString()

    /**
     * Clone only the LatLon interface specific fields (as a workaround
     * for some JSON serialization issues.)
     */
    public LatLonInfo cloneCommon() {
        LatLonInfoImpl clone = new LatLonInfoImpl();
        clone.setLatitude(this.getLatitude());
        clone.setLongitude(this.getLongitude());
        return clone;
    }

} // LatLonImpl

Why does serialization skip this attribute?

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Why does serialization skip this attribute?