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@FactoryConfigurationAdapterService(factoryPid="DictionaryServiceFactoryDictionaryImplFactoryPid", updated="updated")  
public class DictionaryImpl implements DictionaryService {
    /**
     * We store all configured words in a thread-safe data structure, because ConfigAdmin
     * may invoke our updated method at any time.
     */
    private CopyOnWriteArrayList<String> m_words = new CopyOnWriteArrayList<String>();

    /**
     * Our Dictionary language.
     */
    private String m_lang;

    /**
     * Our service will be initialized from ConfigAdmin, and we also handle updates in this method.
     * @param config The configuration where we'll lookup our words list (key="words").
     */
    protected void updated(Dictionary<String, ?> config) {
        m_lang = (String) config.get("lang");
        m_words.clear();
        String[] words = (String[]) config.get("words");
        for (String word : words) {
            m_words.add(word);
        }
    }
           
    /**
     * Check if a word exists if the list of words we have been configured from ConfigAdmin/WebConsole.
     */
    public boolean checkWord(String word) {
        return m_words.contains(word);
    }
}

  @FactoryConfigurationAdapterService(factoryPid="DictionaryServiceFactoryDictionaryImplFactoryPid",
    propagate=true,
    updated="updated",
    heading="Dictionary Services",
    description="Declare here some Dictionary instances, allowing to instantiates some DictionaryService services for a given dictionary language",
    metadata={
        @PropertyMetaData(
            heading="Dictionary Language",
            description="Declare here the language supported by this dictionary. " +
                "This property will be propagated with the Dictionary Service properties.",
            defaults={"en"},
            id="lang",
            cardinality=0),
        @PropertyMetaData(
            heading="Dictionary words",
            description="Declare here the list of words supported by this dictionary.",
            defaults={"hello", "world"},
            id="words",
            cardinality=Integer.MAX_VALUE)
    }
)  
public class DictionaryImpl implements DictionaryService {
    ... code same as before
}