static initializer not working

Hi,

I cannot get my registration of parser to work. When try to make a
call to get the registered parser:

PullParserFactory.instance().createParser(type);

I get a NullPointerException. When I debug I can see that the HashMap
is empty.

What am I missing?

br,

//mike

public class FindBugsParser implements AbstractPullParser{

// Register with Factory
    static {
        PullParserFactory.instance().registerParser(PluginImpl.FINDBUGS,
                new FindBugsParser());
    }

    public AbstractPullParser createParser() {
        return new FindBugsParser();
    }

}

public final class PullParserFactory {

    /**
     * Single instance created upon class loading.
     */
    private static PullParserFactory INSTANCE = new PullParserFactory();

    private static final HashMap<String, AbstractPullParser>
registeredParsers = new HashMap<String, AbstractPullParser>();

    //no outside access.
    private PullParserFactory() {

    }

    public static PullParserFactory instance() {
        return INSTANCE;
    }

    public void registerParser(String type, AbstractPullParser parser) {
        registeredParsers.put(type, parser);
    }

    public AbstractPullParser createParser(String type) {

        return (AbstractPullParser) registeredParsers.get(type);
    }

}